Merge branch 'refs/heads/master' into mca

# Conflicts:
#	build.gradle
#	core/src/main/java/com/volmit/iris/core/ServerConfigurator.java
#	core/src/main/java/com/volmit/iris/core/nms/INMSBinding.java
#	core/src/main/java/com/volmit/iris/engine/object/IrisDimension.java

README.md

@@ -31,7 +31,7 @@ Consider supporting our development by buying Iris on spigot! We work hard to ma
         4. Use `CTRL + X`, then Press `Y`, Then `ENTER`
         5. Quit & Reopen Terminal and verify with `echo $JAVA_HOME`. It should print a directory
 3. If this is your first time building Iris for MC 1.18+ run `gradlew setup` inside the root Iris project folder.
-   Otherwise, skip this step. Grab a coffee, this may take up to 5 minutes depending on your cpu & internet connection.
+   Otherwise, skip this step. Grab a coffee, this may take up to 45 minutes depending on your cpu & internet connection.
 4. Once the project has setup, run `gradlew iris`
 5. The Iris jar will be placed in `Iris/build/Iris-XXX-XXX.jar` Enjoy! Consider supporting us by buying it on spigot!
 

build.gradle

@@ -21,12 +21,12 @@ import java.util.function.Consumer
 plugins {
     id 'java'
     id 'java-library'
-    id "com.github.johnrengelman.shadow" version "7.1.2"
+    id "io.github.goooler.shadow" version "8.1.7"
     id "de.undercouch.download" version "5.0.1"
 }
 
 version '3.2.6-1.19.2-1.20.4'
-def specialSourceVersion = '1.11.0' //[NMS]
+def specialSourceVersion = '1.11.4' //[NMS]
 
 // ADD YOURSELF AS A NEW LINE IF YOU WANT YOUR OWN BUILD TASK GENERATED
 // ======================== WINDOWS =============================
@@ -43,8 +43,8 @@ registerCustomOutputTaskUnix('CyberpwnLT', '/Users/danielmills/development/serve
 registerCustomOutputTaskUnix('PsychoLT', '/Volumes/PRO-G40/Minecraft/MinecraftDevelopment/Server/plugins')
 // ==============================================================
 
-
 def NMS_BINDINGS = Map.of(
+        "v1_20_R4", "1.20.6-R0.1-SNAPSHOT",
         "v1_20_R3", "1.20.4-R0.1-SNAPSHOT",
         "v1_20_R2", "1.20.2-R0.1-SNAPSHOT",
         "v1_20_R1", "1.20.1-R0.1-SNAPSHOT",
@@ -52,11 +52,15 @@ def NMS_BINDINGS = Map.of(
         "v1_19_R2", "1.19.3-R0.1-SNAPSHOT",
         "v1_19_R1", "1.19.2-R0.1-SNAPSHOT"
 )
+def JVM_VERSION = Map.of(
+        "v1_20_R4", 21,
+)
 NMS_BINDINGS.each {
     def key = it.key
     def value = it.value
     def nms =  value.split("-")[0];
     project(":nms:${key}") {
+        apply plugin: 'java'
         apply plugin: 'java-library'
         apply plugin: 'de.undercouch.download'
 
@@ -65,9 +69,10 @@ NMS_BINDINGS.each {
             compileOnly "org.spigotmc:spigot-api:${value}"
             compileOnly "org.bukkit:craftbukkit:${value}:remapped-mojang" //[NMS]
         }
-        def buildToolsJar = new File(rootProject.buildDir, "tools/BuildTools.jar")
+        def buildToolsJar = new File(rootProject.layout.buildDirectory.asFile.get(), "tools/BuildTools.jar")
-        def specialSourceJar = new File(rootProject.buildDir, "tools/SpecialSource.jar")
+        def specialSourceJar = new File(rootProject.layout.buildDirectory.asFile.get(), "tools/SpecialSource.jar")
 
+        def buildDir = layout.buildDirectory.asFile.get();
         def buildToolsFolder = new File(buildDir, "buildtools")
         def specialSourceFolder = new File(buildDir, "specialsource")
         def buildToolsHint = new File(buildDir, "buildtools/craftbukkit-" + nms + ".jar")
@@ -82,6 +87,22 @@ NMS_BINDINGS.each {
         def m2s = m2.getAbsolutePath();
 
         // ======================== Building Mapped Jars =============================
+        def targetJavaVersion = JVM_VERSION.getOrDefault(key, 17)
+        def javaVersion = JavaVersion.toVersion(targetJavaVersion)
+        def javaLanguageVersion = JavaLanguageVersion.of(targetJavaVersion)
+        project.java.sourceCompatibility = javaVersion
+        project.java.targetCompatibility = javaVersion
+        project.java.toolchain.languageVersion = javaLanguageVersion
+        def launcher = javaToolchains.launcherFor(java.toolchain).get()
+        def javaHome = launcher.executablePath.getAsFile().parentFile.parentFile.getAbsolutePath()
+
+        tasks.withType(JavaCompile).configureEach {
+            options.release.set(targetJavaVersion)
+        }
+
+        tasks.withType(JavaExec).configureEach {
+            javaLauncher.set(launcher)
+        }
 
         ext {
             executeBuildTools = new Runnable() {
@@ -99,6 +120,7 @@ NMS_BINDINGS.each {
                     if (!buildToolsHint.exists()) {
                         buildToolsFolder.mkdirs()
                         project.javaexec {
+                            executable = launcher.executablePath
                             classpath = files(buildToolsJar)
                             workingDir = buildToolsFolder
                             args = [
@@ -108,16 +130,14 @@ NMS_BINDINGS.each {
                                     "craftbukkit",
                                     "--remap"
                             ]
+                            def env = new HashMap(environment)
+                            env.put("JAVA_HOME", javaHome)
+                            environment = env
                         }
                     }
                 }
             }
         }
-        tasks.register("executeBuildTools") {
-            doLast {
-                property("executeBuildTools").run();
-            }
-        }
 
         tasks.build.doLast {
             //Download
@@ -137,6 +157,7 @@ NMS_BINDINGS.each {
 
             //obfuscate
             javaexec {
+                executable = launcher.executablePath
                 workingDir = specialSourceFolder
                 classpath = files(specialSourceJar,
                         new File(m2s + "/org/spigotmc/spigot/" + value + "/spigot-" + value + "-remapped-mojang.jar"))
@@ -151,10 +172,14 @@ NMS_BINDINGS.each {
                         m2s + "/org/spigotmc/minecraft-server/" + value + "/minecraft-server-" + value + "-maps-mojang.txt",
                         "--reverse",
                 ]
+                def env = new HashMap(environment)
+                env.put("JAVA_HOME", javaHome)
+                environment = env
             }
 
             //remap
             javaexec {
+                executable = launcher.executablePath
                 workingDir = specialSourceFolder
                 classpath = files(specialSourceJar,
                         new File(m2s + "/org/spigotmc/spigot/" + value + "/spigot-" + value + "-remapped-obf.jar"))
@@ -168,6 +193,9 @@ NMS_BINDINGS.each {
                         "-m",
                         m2s + "/org/spigotmc/minecraft-server/" + value + "/minecraft-server-" + value + "-maps-spigot.csrg"
                 ]
+                def env = new HashMap(environment)
+                env.put("JAVA_HOME", javaHome)
+                environment = env
             }
             //copy
             copy {
@@ -182,6 +210,10 @@ NMS_BINDINGS.each {
 }
 
 shadowJar {
+    NMS_BINDINGS.each {
+        dependsOn(":nms:${it.key}:build")
+        from("${project(":nms:${it.key}").layout.buildDirectory.asFile.get()}/libs/${it.key}.jar")
+    }
     NMS_BINDINGS.each {dependsOn(":nms:${it.key}:build")}
     dependsOn(':com.volmit.gui:build')
 
@@ -230,7 +262,6 @@ allprojects {
 
     dependencies {
         // Provided or Classpath
-       // implementation project(':com.volmit.gui')
         compileOnly 'org.projectlombok:lombok:1.18.24'
         annotationProcessor 'org.projectlombok:lombok:1.18.24'
 
@@ -240,6 +271,8 @@ allprojects {
         implementation "net.kyori:adventure-text-minimessage:4.13.1"
         implementation 'net.kyori:adventure-platform-bukkit:4.3.2'
         implementation 'net.kyori:adventure-api:4.13.1'
+        //implementation 'org.bytedeco:javacpp:1.5.10'
+        //implementation 'org.bytedeco:cuda-platform:12.3-8.9-1.5.10'
         compileOnly 'io.lumine:Mythic-Dist:5.2.1'
 
         // Dynamically Loaded
@@ -289,8 +322,8 @@ if (JavaVersion.current().toString() != "17") {
 
 task iris(type: Copy) {
     group "iris"
-    from new File(buildDir, "libs/Iris-${version}.jar")
+    from new File(layout.buildDirectory.asFile.get(), "libs/Iris-${version}.jar")
-    into buildDir
+    into layout.buildDirectory.asFile.get()
     dependsOn(build)
 }
 
@@ -313,7 +346,9 @@ NMS_BINDINGS.keySet().forEach {
     tasks.register("setup-${nms}") {
         group "iris"
         dependsOn(":nms:${nms}:clean")
-        dependsOn(":nms:${nms}:executeBuildTools")
+        doLast {
+            project(":nms:${nms}").property("executeBuildTools").run();
+        }
     }
 }
 

core/build.gradle

@@ -19,7 +19,7 @@
 plugins {
     id 'java'
     id 'java-library'
-    id "io.freefair.lombok" version "6.3.0"
+    id "io.freefair.lombok" version "8.6"
 }
 
 def apiVersion = '1.19'
@@ -35,6 +35,7 @@ compileJava {
 
 repositories {
     maven { url 'https://nexus.phoenixdevt.fr/repository/maven-public/'}
+    maven { url 'https://repo.auxilor.io/repository/maven-public/' }
 }
 
 /**
@@ -66,6 +67,7 @@ dependencies {
     compileOnly 'com.github.PlaceholderAPI:placeholderapi:2.11.3'
     compileOnly 'com.github.Ssomar-Developement:SCore:4.23.10.8'
     compileOnly 'net.Indyuce:MMOItems-API:6.9.5-SNAPSHOT'
+    compileOnly 'com.willfp:EcoItems:5.44.0'
     //implementation files('libs/CustomItems.jar')
 }
 

core/src/main/java/com/volmit/iris/core/ServerConfigurator.java

@@ -21,6 +21,8 @@ package com.volmit.iris.core;
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.core.nms.INMS;
+import com.volmit.iris.core.nms.datapack.DataVersion;
+import com.volmit.iris.core.nms.datapack.IDataFixer;
 import com.volmit.iris.engine.object.IrisBiome;
 import com.volmit.iris.engine.object.IrisBiomeCustom;
 import com.volmit.iris.engine.object.IrisDimension;
@@ -133,8 +135,36 @@ public class ServerConfigurator {
     }
 
     public static void installDataPacks(boolean fullInstall) {
+        installDataPacks(DataVersion.getDefault(), fullInstall);
+    }
+
+    public static void installDataPacks(IDataFixer fixer, boolean fullInstall) {
         Iris.info("Checking Data Packs...");
         File packs = new File("plugins/Iris/packs");
+        double ultimateMaxHeight = 0;
+        double ultimateMinHeight = 0;
+        if (packs.exists() && packs.isDirectory()) {
+            for (File pack : packs.listFiles()) {
+                IrisData data = IrisData.get(pack);
+                if (pack.isDirectory()) {
+                    File dimensionsFolder = new File(pack, "dimensions");
+                    if (dimensionsFolder.exists() && dimensionsFolder.isDirectory()) {
+                        for (File file : dimensionsFolder.listFiles()) {
+                            if (file.isFile() && file.getName().endsWith(".json")) {
+                                IrisDimension dim = data.getDimensionLoader().load(file.getName().split("\\Q.\\E")[0]);
+                                if (ultimateMaxHeight < dim.getDimensionHeight().getMax()) {
+                                    ultimateMaxHeight = dim.getDimensionHeight().getMax();
+                                }
+                                if (ultimateMinHeight > dim.getDimensionHeight().getMin()) {
+                                    ultimateMinHeight = dim.getDimensionHeight().getMin();
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
         if (packs.exists()) {
             for (File i : packs.listFiles()) {
                 if (i.isDirectory()) {
@@ -153,7 +183,7 @@ public class ServerConfigurator {
 
                                 Iris.verbose("  Checking Dimension " + dim.getLoadFile().getPath());
                                 for (File dpack : getDatapacksFolder()) {
-                                    dim.installDataPack(() -> data, dpack);
+                                    dim.installDataPack(fixer, () -> data, dpack);
                                 }
                             }
                         }

core/src/main/java/com/volmit/iris/core/commands/CommandDeveloper.java

@@ -19,8 +19,10 @@
 package com.volmit.iris.core.commands;
 
 import com.volmit.iris.Iris;
+import com.volmit.iris.core.ServerConfigurator;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.core.nms.INMS;
+import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.core.nms.v1X.NMSBinding1X;
 import com.volmit.iris.core.pregenerator.ChunkUpdater;
 import com.volmit.iris.core.service.IrisEngineSVC;
@@ -161,6 +163,14 @@ public class CommandDeveloper implements DecreeExecutor {
 
     }
 
+    @Decree(description = "Upgrade to another Minecraft version")
+    public void upgrade(
+            @Param(description = "The version to upgrade to", defaultValue = "latest") DataVersion version) {
+        sender().sendMessage(C.GREEN + "Upgrading to " + version.getVersion() + "...");
+        ServerConfigurator.installDataPacks(version.get(), false);
+        sender().sendMessage(C.GREEN + "Done upgrading! You can now update your server version to " + version.getVersion());
+    }
+
     @Decree(description = "Test")
     public void updater(
             @Param(description = "Updater for chunks")

core/src/main/java/com/volmit/iris/core/commands/CommandIris.java

@@ -20,7 +20,9 @@ package com.volmit.iris.core.commands;
 
 import com.volmit.iris.Iris;
 import com.volmit.iris.core.IrisSettings;
+import com.volmit.iris.core.ServerConfigurator;
 import com.volmit.iris.core.loader.IrisData;
+import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.core.pregenerator.ChunkUpdater;
 import com.volmit.iris.core.safeguard.IrisSafeguard;
 import com.volmit.iris.core.service.StudioSVC;

core/src/main/java/com/volmit/iris/core/commands/CommandObject.java

@@ -35,6 +35,7 @@ import com.volmit.iris.util.decree.specialhandlers.ObjectHandler;
 import com.volmit.iris.util.format.C;
 import com.volmit.iris.util.math.Direction;
 import com.volmit.iris.util.math.RNG;
+import com.volmit.iris.util.misc.E;
 import com.volmit.iris.util.scheduling.Queue;
 import org.bukkit.*;
 import org.bukkit.block.Block;
@@ -52,7 +53,7 @@ import java.util.*;
 @Decree(name = "object", aliases = "o", origin = DecreeOrigin.PLAYER, studio = true, description = "Iris object manipulation")
 public class CommandObject implements DecreeExecutor {
 
-    private static final Set<Material> skipBlocks = Set.of(Material.GRASS, Material.SNOW, Material.VINE, Material.TORCH, Material.DEAD_BUSH,
+    private static final Set<Material> skipBlocks = Set.of(E.getOrDefault(Material.class, "GRASS", "SHORT_GRASS"), Material.SNOW, Material.VINE, Material.TORCH, Material.DEAD_BUSH,
             Material.POPPY, Material.DANDELION);
 
     public static IObjectPlacer createPlacer(World world, Map<Block, BlockData> futureBlockChanges) {

core/src/main/java/com/volmit/iris/core/link/EcoItemsDataProvider.java

@@ -0,0 +1,71 @@
+package com.volmit.iris.core.link;
+
+import com.volmit.iris.Iris;
+import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.reflect.WrappedField;
+import com.willfp.ecoitems.items.EcoItem;
+import com.willfp.ecoitems.items.EcoItems;
+import org.bukkit.NamespacedKey;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.MissingResourceException;
+
+public class EcoItemsDataProvider extends ExternalDataProvider {
+    private WrappedField<EcoItem, ItemStack> itemStack;
+    private WrappedField<EcoItem, NamespacedKey> id;
+
+    public EcoItemsDataProvider() {
+        super("EcoItems");
+    }
+
+    @Override
+    public void init() {
+        Iris.info("Setting up EcoItems Link...");
+        itemStack = new WrappedField<>(EcoItem.class, "_itemStack");
+        if (this.itemStack.hasFailed()) {
+            Iris.error("Failed to set up EcoItems Link: Unable to fetch ItemStack field!");
+        }
+        id = new WrappedField<>(EcoItem.class, "id");
+        if (this.id.hasFailed()) {
+            Iris.error("Failed to set up EcoItems Link: Unable to fetch id field!");
+        }
+    }
+
+    @Override
+    public BlockData getBlockData(Identifier blockId) throws MissingResourceException {
+        throw new MissingResourceException("Failed to find BlockData!", blockId.namespace(), blockId.key());
+    }
+
+    @Override
+    public ItemStack getItemStack(Identifier itemId) throws MissingResourceException {
+        EcoItem item = EcoItems.INSTANCE.getByID(itemId.key());
+        if (item == null) throw new MissingResourceException("Failed to find Item!", itemId.namespace(), itemId.key());
+        return itemStack.get(item).clone();
+    }
+
+    @Override
+    public Identifier[] getBlockTypes() {
+        return new Identifier[0];
+    }
+
+    @Override
+    public Identifier[] getItemTypes() {
+        KList<Identifier> names = new KList<>();
+        for (EcoItem item : EcoItems.INSTANCE.values()) {
+            try {
+                Identifier key = Identifier.fromNamespacedKey(id.get(item));
+                if (getItemStack(key) != null)
+                    names.add(key);
+            } catch (MissingResourceException ignored) {
+            }
+        }
+
+        return names.toArray(new Identifier[0]);
+    }
+
+    @Override
+    public boolean isValidProvider(Identifier id, boolean isItem) {
+        return id.namespace().equalsIgnoreCase("ecoitems") && isItem;
+    }
+}

core/src/main/java/com/volmit/iris/core/link/Identifier.java

@@ -6,6 +6,10 @@ public record Identifier(String namespace, String key) {
 
     private static final String DEFAULT_NAMESPACE = "minecraft";
 
+    public static Identifier fromNamespacedKey(NamespacedKey key) {
+        return new Identifier(key.getNamespace(), key.getKey());
+    }
+
     public static Identifier fromString(String id) {
         String[] strings = id.split(":", 2);
         if (strings.length == 1) {

core/src/main/java/com/volmit/iris/core/nms/INMS.java

@@ -23,7 +23,13 @@ import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.nms.v1X.NMSBinding1X;
 import org.bukkit.Bukkit;
 
+import java.util.Map;
+
 public class INMS {
+    private static final Map<String, String> REVISION = Map.of(
+        "1.20.5", "v1_20_R4",
+        "1.20.6", "v1_20_R4"
+    );
     //@done
     private static final INMSBinding binding = bind();
 
@@ -37,7 +43,12 @@ public class INMS {
         }
 
         try {
-            return Bukkit.getServer().getClass().getCanonicalName().split("\\Q.\\E")[3];
+            String name = Bukkit.getServer().getClass().getCanonicalName();
+            if (name.equals("org.bukkit.craftbukkit.CraftServer")) {
+                return REVISION.getOrDefault(Bukkit.getServer().getBukkitVersion().split("-")[0], "BUKKIT");
+            } else {
+                return name.split("\\Q.\\E")[3];
+            }
         } catch (Throwable e) {
             Iris.reportError(e);
             Iris.error("Failed to determine server nms version!");

core/src/main/java/com/volmit/iris/core/nms/INMSBinding.java

@@ -18,6 +18,7 @@
 
 package com.volmit.iris.core.nms;
 
+import com.volmit.iris.core.nms.datapack.DataVersion;
 import com.volmit.iris.engine.framework.Engine;
 import com.volmit.iris.engine.object.IrisDimension;
 import com.volmit.iris.util.collection.KList;
@@ -37,6 +38,7 @@ import org.bukkit.entity.Dolphin;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.EntityType;
 import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.bukkit.event.entity.EntitySpawnEvent;
 import org.bukkit.generator.ChunkGenerator;
 import org.bukkit.inventory.ItemStack;
 
@@ -115,6 +117,10 @@ public interface INMSBinding {
     
     Entity spawnEntity(Location location, EntityType type, CreatureSpawnEvent.SpawnReason reason);
 
+    default DataVersion getDataVersion() {
+        return DataVersion.V1192;
+    }
+
     boolean loadDatapack(File datapackFolder, boolean replace);
 
     boolean registerDimension(String name, IrisDimension dimension);

core/src/main/java/com/volmit/iris/core/nms/datapack/DataVersion.java

@@ -0,0 +1,40 @@
+package com.volmit.iris.core.nms.datapack;
+
+import com.volmit.iris.core.nms.INMS;
+import com.volmit.iris.core.nms.datapack.v1192.DataFixerV1192;
+import com.volmit.iris.core.nms.datapack.v1206.DataFixerV1206;
+import com.volmit.iris.util.collection.KMap;
+import lombok.AccessLevel;
+import lombok.Getter;
+
+import java.util.function.Supplier;
+
+//https://minecraft.wiki/w/Pack_format
+@Getter
+public enum DataVersion {
+    V1192("1.19.2", 10, DataFixerV1192::new),
+    V1205("1.20.6", 41, DataFixerV1206::new);
+    private static final KMap<DataVersion, IDataFixer> cache = new KMap<>();
+    @Getter(AccessLevel.NONE)
+    private final Supplier<IDataFixer> constructor;
+    private final String version;
+    private final int packFormat;
+
+    DataVersion(String version, int packFormat, Supplier<IDataFixer> constructor) {
+        this.constructor = constructor;
+        this.packFormat = packFormat;
+        this.version = version;
+    }
+
+    public IDataFixer get() {
+        return cache.computeIfAbsent(this, k -> constructor.get());
+    }
+
+    public static IDataFixer getDefault() {
+        return INMS.get().getDataVersion().get();
+    }
+
+    public static DataVersion getLatest() {
+        return values()[values().length - 1];
+    }
+}

core/src/main/java/com/volmit/iris/core/nms/datapack/IDataFixer.java

@@ -0,0 +1,11 @@
+package com.volmit.iris.core.nms.datapack;
+
+import com.volmit.iris.engine.object.IrisBiomeCustom;
+import com.volmit.iris.util.json.JSONObject;
+
+public interface IDataFixer {
+
+    JSONObject fixCustomBiome(IrisBiomeCustom biome, JSONObject json);
+
+    JSONObject fixDimension(JSONObject json);
+}

core/src/main/java/com/volmit/iris/core/nms/datapack/v1192/DataFixerV1192.java

@@ -0,0 +1,18 @@
+package com.volmit.iris.core.nms.datapack.v1192;
+
+import com.volmit.iris.core.nms.datapack.IDataFixer;
+import com.volmit.iris.engine.object.IrisBiomeCustom;
+import com.volmit.iris.util.json.JSONObject;
+
+public class DataFixerV1192 implements IDataFixer {
+
+    @Override
+    public JSONObject fixCustomBiome(IrisBiomeCustom biome, JSONObject json) {
+        return json;
+    }
+
+    @Override
+    public JSONObject fixDimension(JSONObject json) {
+        return json;
+    }
+}

core/src/main/java/com/volmit/iris/core/nms/datapack/v1206/DataFixerV1206.java

@@ -0,0 +1,54 @@
+package com.volmit.iris.core.nms.datapack.v1206;
+
+import com.volmit.iris.core.nms.datapack.IDataFixer;
+import com.volmit.iris.engine.object.IrisBiomeCustom;
+import com.volmit.iris.engine.object.IrisBiomeCustomSpawn;
+import com.volmit.iris.engine.object.IrisBiomeCustomSpawnType;
+import com.volmit.iris.util.collection.KMap;
+import com.volmit.iris.util.json.JSONArray;
+import com.volmit.iris.util.json.JSONObject;
+
+import java.util.Locale;
+
+public class DataFixerV1206 implements IDataFixer {
+    @Override
+    public JSONObject fixCustomBiome(IrisBiomeCustom biome, JSONObject json) {
+        int spawnRarity = biome.getSpawnRarity();
+        if (spawnRarity > 0) {
+            json.put("creature_spawn_probability", Math.min(spawnRarity/20d, 0.9999999));
+        }
+
+        var spawns = biome.getSpawns();
+        if (spawns != null && spawns.isNotEmpty()) {
+            JSONObject spawners = new JSONObject();
+            KMap<IrisBiomeCustomSpawnType, JSONArray> groups = new KMap<>();
+
+            for (IrisBiomeCustomSpawn i : spawns) {
+                JSONArray g = groups.computeIfAbsent(i.getGroup(), (k) -> new JSONArray());
+                JSONObject o = new JSONObject();
+                o.put("type", "minecraft:" + i.getType().name().toLowerCase());
+                o.put("weight", i.getWeight());
+                o.put("minCount", Math.min(i.getMinCount()/20d, 0));
+                o.put("maxCount", Math.min(i.getMaxCount()/20d, 0.9999999));
+                g.put(o);
+            }
+
+            for (IrisBiomeCustomSpawnType i : groups.k()) {
+                spawners.put(i.name().toLowerCase(Locale.ROOT), groups.get(i));
+            }
+
+            json.put("spawners", spawners);
+        }
+        return json;
+    }
+
+    @Override
+    public JSONObject fixDimension(JSONObject json) {
+        if (!(json.get("monster_spawn_light_level") instanceof JSONObject lightLevel))
+            return json;
+        var value = (JSONObject) lightLevel.remove("value");
+        lightLevel.put("max_inclusive", value.get("max_inclusive"));
+        lightLevel.put("min_inclusive", value.get("min_inclusive"));
+        return json;
+    }
+}

core/src/main/java/com/volmit/iris/core/safeguard/ServerBootSFG.java

@@ -15,6 +15,7 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.nio.file.StandardOpenOption;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 import java.util.StringJoiner;
 
@@ -81,7 +82,7 @@ public class ServerBootSFG {
             severityHigh++;
         }
 
-        if (getJavaVersion() != 17) {
+        if (!List.of(17, 21).contains(getJavaVersion())) {
             isJDK17 = false;
             joiner.add("Unsupported Java version");
             severityMedium++;

core/src/main/java/com/volmit/iris/core/safeguard/UtilsSFG.java

@@ -37,7 +37,7 @@ public class UtilsSFG {
             }
             if (ServerBootSFG.unsuportedversion) {
                 Iris.safeguard(C.RED + "Server Version");
-                Iris.safeguard(C.RED + "- Iris only supports 1.19.2 > 1.20.4");
+                Iris.safeguard(C.RED + "- Iris only supports 1.19.2 > 1.20.6");
             }
             if (!ServerBootSFG.passedserversoftware) {
                 Iris.safeguard(C.YELLOW + "Unsupported Server Software");
@@ -53,11 +53,11 @@ public class UtilsSFG {
             }
             if (!ServerBootSFG.isJDK17) {
                 Iris.safeguard(C.YELLOW + "Unsupported java version");
-                Iris.safeguard(C.YELLOW + "- Please consider using JDK 17 Instead of JDK " + Iris.getJavaVersion());
+                Iris.safeguard(C.YELLOW + "- Please consider using JDK 17 (or 21 for 1.20.6) Instead of JDK " + Iris.getJavaVersion());
             }
             if (ServerBootSFG.isJRE) {
                 Iris.safeguard(C.YELLOW + "Unsupported Server JDK");
-                Iris.safeguard(C.YELLOW + "- Please consider using JDK 17 Instead of JRE " + Iris.getJavaVersion());
+                Iris.safeguard(C.YELLOW + "- Please consider using JDK 17 (or 21 for 1.20.6) Instead of JRE " + Iris.getJavaVersion());
             }
         }
     }

core/src/main/java/com/volmit/iris/core/service/ExternalDataSVC.java

@@ -64,6 +64,10 @@ public class ExternalDataSVC implements IrisService {
         if (Bukkit.getPluginManager().getPlugin("MMOItems") != null) {
             Iris.info("MMOItems found, loading MMOItemsDataProvider...");
         }
+        providers.add(new EcoItemsDataProvider());
+        if (Bukkit.getPluginManager().getPlugin("EcoItems") != null) {
+            Iris.info("EcoItems found, loading EcoItemsDataProvider...");
+        }
 
         for (ExternalDataProvider p : providers) {
             if (p.isReady()) {

core/src/main/java/com/volmit/iris/core/service/WandSVC.java

@@ -30,9 +30,11 @@ import com.volmit.iris.util.format.C;
 import com.volmit.iris.util.math.M;
 import com.volmit.iris.util.matter.Matter;
 import com.volmit.iris.util.matter.WorldMatter;
+import com.volmit.iris.util.misc.E;
 import com.volmit.iris.util.plugin.IrisService;
 import com.volmit.iris.util.plugin.VolmitSender;
 import com.volmit.iris.util.scheduling.J;
+import com.volmit.iris.util.scheduling.S;
 import org.bukkit.*;
 import org.bukkit.block.Block;
 import org.bukkit.enchantments.Enchantment;
@@ -53,6 +55,9 @@ import java.util.ArrayList;
 import java.util.Objects;
 
 public class WandSVC implements IrisService {
+    private static final Particle CRIT_MAGIC = E.getOrDefault(Particle.class, "CRIT_MAGIC", "CRIT");
+    private static final Particle REDSTONE = E.getOrDefault(Particle.class,  "REDSTONE", "DUST");
+
     private static ItemStack dust;
     private static ItemStack wand;
 
@@ -162,11 +167,11 @@ public class WandSVC implements IrisService {
      */
     public static ItemStack createDust() {
         ItemStack is = new ItemStack(Material.GLOWSTONE_DUST);
-        is.addUnsafeEnchantment(Enchantment.ARROW_INFINITE, 1);
+        is.addUnsafeEnchantment(Enchantment.FIRE_ASPECT, 1);
         ItemMeta im = is.getItemMeta();
         im.setDisplayName(C.BOLD + "" + C.YELLOW + "Dust of Revealing");
         im.setUnbreakable(true);
-        im.addItemFlags(ItemFlag.HIDE_ATTRIBUTES, ItemFlag.HIDE_PLACED_ON, ItemFlag.HIDE_POTION_EFFECTS, ItemFlag.HIDE_DESTROYS, ItemFlag.HIDE_ENCHANTS);
+        im.addItemFlags(ItemFlag.values());
         im.setLore(new KList<String>().qadd("Right click on a block to reveal it's placement structure!"));
         is.setItemMeta(im);
 
@@ -206,11 +211,11 @@ public class WandSVC implements IrisService {
      */
     public static ItemStack createWand(Location a, Location b) {
         ItemStack is = new ItemStack(Material.BLAZE_ROD);
-        is.addUnsafeEnchantment(Enchantment.ARROW_INFINITE, 1);
+        is.addUnsafeEnchantment(Enchantment.FIRE_ASPECT, 1);
         ItemMeta im = is.getItemMeta();
         im.setDisplayName(C.BOLD + "" + C.GOLD + "Wand of Iris");
         im.setUnbreakable(true);
-        im.addItemFlags(ItemFlag.HIDE_ATTRIBUTES, ItemFlag.HIDE_PLACED_ON, ItemFlag.HIDE_POTION_EFFECTS, ItemFlag.HIDE_DESTROYS, ItemFlag.HIDE_ENCHANTS);
+        im.addItemFlags(ItemFlag.values());
         im.setLore(new KList<String>().add(locationToString(a), locationToString(b)));
         is.setItemMeta(im);
 
@@ -311,7 +316,7 @@ public class WandSVC implements IrisService {
      */
     public void draw(Location[] d, Player p) {
         Vector gx = Vector.getRandom().subtract(Vector.getRandom()).normalize().clone().multiply(0.65);
-        d[0].getWorld().spawnParticle(Particle.CRIT_MAGIC, d[0], 1, 0.5 + gx.getX(), 0.5 + gx.getY(), 0.5 + gx.getZ(), 0, null, false);
+        d[0].getWorld().spawnParticle(CRIT_MAGIC, d[0], 1, 0.5 + gx.getX(), 0.5 + gx.getY(), 0.5 + gx.getZ(), 0, null, false);
         Vector gxx = Vector.getRandom().subtract(Vector.getRandom()).normalize().clone().multiply(0.65);
         d[1].getWorld().spawnParticle(Particle.CRIT, d[1], 1, 0.5 + gxx.getX(), 0.5 + gxx.getY(), 0.5 + gxx.getZ(), 0, null, false);
 
@@ -370,7 +375,7 @@ public class WandSVC implements IrisService {
                             int r = color.getRed();
                             int g = color.getGreen();
                             int b = color.getBlue();
-                            p.spawnParticle(Particle.REDSTONE, lv.getX(), lv.getY(), lv.getZ(), 1, 0, 0, 0, 0, new Particle.DustOptions(org.bukkit.Color.fromRGB(r, g, b), 0.75f));
+                            p.spawnParticle(REDSTONE, lv.getX(), lv.getY(), lv.getZ(), 1, 0, 0, 0, 0, new Particle.DustOptions(org.bukkit.Color.fromRGB(r, g, b), 0.75f));
                         }
                     }
                 }

core/src/main/java/com/volmit/iris/core/wand/WandSelection.java

@@ -21,6 +21,7 @@ package com.volmit.iris.core.wand;
 import com.volmit.iris.util.data.Cuboid;
 import com.volmit.iris.util.math.M;
 import com.volmit.iris.util.math.RNG;
+import com.volmit.iris.util.misc.E;
 import org.bukkit.Location;
 import org.bukkit.Particle;
 import org.bukkit.entity.Player;
@@ -29,6 +30,7 @@ import org.bukkit.util.Vector;
 import java.awt.*;
 
 public class WandSelection {
+    private static final Particle REDSTONE = E.getOrDefault(Particle.class,  "REDSTONE", "DUST");
     private final Cuboid c;
     private final Player p;
 
@@ -101,7 +103,7 @@ public class WandSelection {
                             int g = color.getGreen();
                             int b = color.getBlue();
 
-                            p.spawnParticle(Particle.REDSTONE, a.getX(), a.getY(), a.getZ(),
+                            p.spawnParticle(REDSTONE, a.getX(), a.getY(), a.getZ(),
                                     1, 0, 0, 0, 0,
                                     new Particle.DustOptions(org.bukkit.Color.fromRGB(r, g, b),
                                             (float) dist * 3f));

core/src/main/java/com/volmit/iris/engine/object/IrisBiomeCustom.java

@@ -19,6 +19,7 @@
 package com.volmit.iris.engine.object;
 
 import com.volmit.iris.Iris;
+import com.volmit.iris.core.nms.datapack.IDataFixer;
 import com.volmit.iris.engine.object.annotations.*;
 import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.collection.KMap;
@@ -68,8 +69,10 @@ public class IrisBiomeCustom {
     @Desc("The biome's category type")
     private IrisBiomeCustomCategory category = IrisBiomeCustomCategory.plains;
 
+    @MinNumber(0)
+    @MaxNumber(20)
     @Desc("The spawn rarity of any defined spawners")
-    private int spawnRarity = -1;
+    private int spawnRarity = 0;
 
     @Desc("The color of the sky, top half of sky. (hex format)")
     private String skyColor = "#79a8e1";
@@ -89,7 +92,7 @@ public class IrisBiomeCustom {
     @Desc("The color of foliage (hex format). Leave blank / don't define to not change")
     private String foliageColor = "";
 
-    public String generateJson() {
+    public String generateJson(IDataFixer fixer) {
         JSONObject effects = new JSONObject();
         effects.put("sky_color", parseColor(getSkyColor()));
         effects.put("fog_color", parseColor(getFogColor()));
@@ -155,7 +158,7 @@ public class IrisBiomeCustom {
             j.put("spawners", spawners);
         }
 
-        return j.toString(4);
+        return fixer.fixCustomBiome(this, j).toString(4);
     }
 
     private int parseColor(String c) {

core/src/main/java/com/volmit/iris/engine/object/IrisDimension.java

@@ -19,15 +19,13 @@
 package com.volmit.iris.engine.object;
 
 import com.volmit.iris.Iris;
-import com.volmit.iris.core.IrisSettings;
 import com.volmit.iris.core.loader.IrisData;
 import com.volmit.iris.core.loader.IrisRegistrant;
+import com.volmit.iris.core.nms.datapack.IDataFixer;
 import com.volmit.iris.engine.data.cache.AtomicCache;
-import com.volmit.iris.engine.framework.Engine;
 import com.volmit.iris.engine.object.annotations.*;
 import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.data.DataProvider;
-import com.volmit.iris.util.data.Dimension;
 import com.volmit.iris.util.io.IO;
 import com.volmit.iris.util.json.JSONObject;
 import com.volmit.iris.util.math.Position2;
@@ -43,7 +41,6 @@ import org.bukkit.Material;
 import org.bukkit.World.Environment;
 import org.bukkit.block.data.BlockData;
 
-import java.io.DataInput;
 import java.io.File;
 import java.io.IOException;
 
@@ -380,7 +377,7 @@ public class IrisDimension extends IrisRegistrant {
         return landBiomeStyle;
     }
 
-    public boolean installDataPack(DataProvider data, File datapacks) {
+    public boolean installDataPack(IDataFixer fixer, DataProvider data, File datapacks) {
         boolean write = false;
         boolean changed = false;
 
@@ -400,7 +397,7 @@ public class IrisDimension extends IrisRegistrant {
                     Iris.verbose("    Installing Data Pack Biome: " + output.getPath());
                     output.getParentFile().mkdirs();
                     try {
-                        IO.writeAll(output, j.generateJson());
+                        IO.writeAll(output, j.generateJson(fixer));
                     } catch (IOException e) {
                         Iris.reportError(e);
                         e.printStackTrace();

core/src/main/java/com/volmit/iris/engine/object/IrisEntity.java

@@ -29,6 +29,7 @@ import com.volmit.iris.util.format.C;
 import com.volmit.iris.util.json.JSONObject;
 import com.volmit.iris.util.math.M;
 import com.volmit.iris.util.math.RNG;
+import com.volmit.iris.util.misc.E;
 import com.volmit.iris.util.plugin.Chunks;
 import com.volmit.iris.util.plugin.VolmitSender;
 import com.volmit.iris.util.scheduling.J;
@@ -65,6 +66,7 @@ import java.util.concurrent.atomic.AtomicReference;
 @Data
 @EqualsAndHashCode(callSuper = false)
 public class IrisEntity extends IrisRegistrant {
+    private static final Particle ITEM = E.getOrDefault(Particle.class, "ITEM_CRACK", "ITEM");
     @Required
     @Desc("The type of entity to spawn. To spawn a mythic mob, set this type to unknown and define mythic type.")
     private EntityType type = EntityType.UNKNOWN;
@@ -386,7 +388,7 @@ public class IrisEntity extends IrisRegistrant {
                     if (e.getLocation().getBlock().getType().isSolid() || ((LivingEntity) e).getEyeLocation().getBlock().getType().isSolid()) {
                         e.teleport(start.add(new Vector(0, 0.1, 0)));
                         ItemStack itemCrackData = new ItemStack(((LivingEntity) e).getEyeLocation().clone().subtract(0, 2, 0).getBlock().getBlockData().getMaterial());
-                        e.getWorld().spawnParticle(Particle.ITEM_CRACK, ((LivingEntity) e).getEyeLocation(), 6, 0.2, 0.4, 0.2, 0.06f, itemCrackData);
+                        e.getWorld().spawnParticle(ITEM, ((LivingEntity) e).getEyeLocation(), 6, 0.2, 0.4, 0.2, 0.06f, itemCrackData);
                         if (M.r(0.2)) {
                             e.getWorld().playSound(e.getLocation(), Sound.BLOCK_CHORUS_FLOWER_GROW, 0.8f, 0.1f);
                         }

core/src/main/java/com/volmit/iris/util/data/B.java

@@ -25,6 +25,7 @@ import com.volmit.iris.core.service.ExternalDataSVC;
 import com.volmit.iris.engine.object.IrisCompat;
 import com.volmit.iris.util.collection.KList;
 import com.volmit.iris.util.collection.KMap;
+import com.volmit.iris.util.misc.E;
 import com.volmit.iris.util.scheduling.ChronoLatch;
 import it.unimi.dsi.fastutil.ints.*;
 import org.bukkit.Bukkit;
@@ -46,6 +47,7 @@ public class B {
     private static final KMap<String, BlockData> custom = new KMap<>();
 
     private static final Material AIR_MATERIAL = Material.AIR;
+    private static final Material SHORT_GRASS = E.getOrDefault(Material.class, "GRASS", "SHORT_GRASS");
     private static final BlockData AIR = AIR_MATERIAL.createBlockData();
     private static final IntSet foliageCache = buildFoliageCache();
     private static final IntSet deepslateCache = buildDeepslateCache();
@@ -85,7 +87,7 @@ public class B {
                 WHITE_TULIP,
                 FERN,
                 LARGE_FERN,
-                GRASS,
+                SHORT_GRASS,
                 TALL_GRASS
         }).forEach((i) -> b.add(i.ordinal()));
 
@@ -143,7 +145,7 @@ public class B {
     private static IntSet buildDecorantCache() {
         IntSet b = new IntOpenHashSet();
         Arrays.stream(new Material[]{
-                GRASS,
+                SHORT_GRASS,
                 TALL_GRASS,
                 TALL_SEAGRASS,
                 FERN,

core/src/main/java/com/volmit/iris/util/data/IrisBlockData.java

@@ -15,7 +15,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 @Data
-public class IrisBlockData implements BlockData{
+public class IrisBlockData implements BlockData {
 	private final @NonNull BlockData base;
 	private final @NotNull Identifier custom;
 

core/src/main/java/com/volmit/iris/util/decree/handlers/DataVersionHandler.java

@@ -0,0 +1,36 @@
+package com.volmit.iris.util.decree.handlers;
+
+import com.volmit.iris.core.nms.datapack.DataVersion;
+import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.decree.DecreeParameterHandler;
+import com.volmit.iris.util.decree.exceptions.DecreeParsingException;
+
+public class DataVersionHandler implements DecreeParameterHandler<DataVersion> {
+    @Override
+    public KList<DataVersion> getPossibilities() {
+        return new KList<>(DataVersion.values());
+    }
+
+    @Override
+    public String toString(DataVersion version) {
+        return version.getVersion();
+    }
+
+    @Override
+    public DataVersion parse(String in, boolean force) throws DecreeParsingException {
+        if (in.equalsIgnoreCase("latest")) {
+            return DataVersion.getLatest();
+        }
+        for (DataVersion v : DataVersion.values()) {
+            if (v.getVersion().equalsIgnoreCase(in)) {
+                return v;
+            }
+        }
+        throw new DecreeParsingException("Unable to parse data version \"" + in + "\"");
+    }
+
+    @Override
+    public boolean supports(Class<?> type) {
+        return DataVersion.class.equals(type);
+    }
+}

core/src/main/java/com/volmit/iris/util/inventorygui/UIElement.java

@@ -212,7 +212,7 @@ public class UIElement implements Element {
             im.setLore(getLore().copy());
 
             if (isEnchanted()) {
-                im.addEnchant(Enchantment.DURABILITY, 1, true);
+                im.addEnchant(Enchantment.FIRE_ASPECT, 1, true);
             }
 
             is.setItemMeta(im);

core/src/main/java/com/volmit/iris/util/misc/E.java

@@ -0,0 +1,12 @@
+package com.volmit.iris.util.misc;
+
+public class E {
+
+    public static <T extends Enum<T>> T getOrDefault(Class<T> enumClass, String name, String fallback) {
+        try {
+            return Enum.valueOf(enumClass, name);
+        } catch (Throwable e) {
+            return Enum.valueOf(enumClass, fallback);
+        }
+    }
+}

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

nms/v1_20_R4/src/main/java/com/volmit/iris/core/nms/v1_20_R4/CustomBiomeSource.java

@@ -0,0 +1,168 @@
+package com.volmit.iris.core.nms.v1_20_R4;
+
+import com.mojang.serialization.MapCodec;
+import com.volmit.iris.Iris;
+import com.volmit.iris.engine.data.cache.AtomicCache;
+import com.volmit.iris.engine.framework.Engine;
+import com.volmit.iris.engine.object.IrisBiome;
+import com.volmit.iris.engine.object.IrisBiomeCustom;
+import com.volmit.iris.util.collection.KMap;
+import com.volmit.iris.util.math.RNG;
+import net.minecraft.core.Holder;
+import net.minecraft.core.Registry;
+import net.minecraft.core.RegistryAccess;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.world.level.biome.Biome;
+import net.minecraft.world.level.biome.BiomeSource;
+import net.minecraft.world.level.biome.Climate;
+import org.bukkit.Bukkit;
+import org.bukkit.World;
+import org.bukkit.craftbukkit.v1_20_R4.CraftServer;
+import org.bukkit.craftbukkit.v1_20_R4.CraftWorld;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+import java.util.stream.Stream;
+
+public class CustomBiomeSource extends BiomeSource {
+
+    private final long seed;
+    private final Engine engine;
+    private final Registry<Biome> biomeCustomRegistry;
+    private final Registry<Biome> biomeRegistry;
+    private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final RNG rng;
+    private final KMap<String, Holder<Biome>> customBiomes;
+
+    public CustomBiomeSource(long seed, Engine engine, World world) {
+        this.engine = engine;
+        this.seed = seed;
+        this.biomeCustomRegistry = registry().registry(Registries.BIOME).orElse(null);
+        this.biomeRegistry = ((RegistryAccess) getFor(RegistryAccess.Frozen.class, ((CraftServer) Bukkit.getServer()).getHandle().getServer())).registry(Registries.BIOME).orElse(null);
+        this.rng = new RNG(engine.getSeedManager().getBiome());
+        this.customBiomes = fillCustomBiomes(biomeCustomRegistry, engine);
+    }
+
+    private static List<Holder<Biome>> getAllBiomes(Registry<Biome> customRegistry, Registry<Biome> registry, Engine engine) {
+        List<Holder<Biome>> b = new ArrayList<>();
+
+        for (IrisBiome i : engine.getAllBiomes()) {
+            if (i.isCustom()) {
+                for (IrisBiomeCustom j : i.getCustomDerivitives()) {
+                    b.add(customRegistry.getHolder(customRegistry.getResourceKey(customRegistry
+                            .get(new ResourceLocation(engine.getDimension().getLoadKey() + ":" + j.getId()))).get()).get());
+                }
+            } else {
+                b.add(NMSBinding.biomeToBiomeBase(registry, i.getVanillaDerivative()));
+            }
+        }
+
+        return b;
+    }
+
+    private static Object getFor(Class<?> type, Object source) {
+        Object o = fieldFor(type, source);
+
+        if (o != null) {
+            return o;
+        }
+
+        return invokeFor(type, source);
+    }
+
+    private static Object fieldFor(Class<?> returns, Object in) {
+        return fieldForClass(returns, in.getClass(), in);
+    }
+
+    private static Object invokeFor(Class<?> returns, Object in) {
+        for (Method i : in.getClass().getMethods()) {
+            if (i.getReturnType().equals(returns)) {
+                i.setAccessible(true);
+                try {
+                    Iris.debug("[NMS] Found " + returns.getSimpleName() + " in " + in.getClass().getSimpleName() + "." + i.getName() + "()");
+                    return i.invoke(in);
+                } catch (Throwable e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+
+        return null;
+    }
+
+    @SuppressWarnings("unchecked")
+    private static <T> T fieldForClass(Class<T> returnType, Class<?> sourceType, Object in) {
+        for (Field i : sourceType.getDeclaredFields()) {
+            if (i.getType().equals(returnType)) {
+                i.setAccessible(true);
+                try {
+                    Iris.debug("[NMS] Found " + returnType.getSimpleName() + " in " + sourceType.getSimpleName() + "." + i.getName());
+                    return (T) i.get(in);
+                } catch (IllegalAccessException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return null;
+    }
+
+    @Override
+    protected Stream<Holder<Biome>> collectPossibleBiomes() {
+        return getAllBiomes(
+                ((RegistryAccess) getFor(RegistryAccess.Frozen.class, ((CraftServer) Bukkit.getServer()).getHandle().getServer()))
+                        .registry(Registries.BIOME).orElse(null),
+                ((CraftWorld) engine.getWorld().realWorld()).getHandle().registryAccess().registry(Registries.BIOME).orElse(null),
+                engine).stream();
+    }
+    private KMap<String, Holder<Biome>> fillCustomBiomes(Registry<Biome> customRegistry, Engine engine) {
+        KMap<String, Holder<Biome>> m = new KMap<>();
+
+        for (IrisBiome i : engine.getAllBiomes()) {
+            if (i.isCustom()) {
+                for (IrisBiomeCustom j : i.getCustomDerivitives()) {
+                    ResourceLocation resourceLocation = new ResourceLocation(engine.getDimension().getLoadKey() + ":" + j.getId());
+                    Biome biome = customRegistry.get(resourceLocation);
+                    Optional<ResourceKey<Biome>> optionalBiomeKey = customRegistry.getResourceKey(biome);
+                    if (optionalBiomeKey.isEmpty()) {
+                        Iris.error("Cannot find biome for IrisBiomeCustom " + j.getId() + " from engine " + engine.getName());
+                        continue;
+                    }
+                    ResourceKey<Biome> biomeKey = optionalBiomeKey.get();
+                    Optional<Holder.Reference<Biome>> optionalReferenceHolder = customRegistry.getHolder(biomeKey);
+                    if (optionalReferenceHolder.isEmpty()) {
+                        Iris.error("Cannot find reference to biome " + biomeKey + " for engine " + engine.getName());
+                        continue;
+                    }
+                    m.put(j.getId(), optionalReferenceHolder.get());
+                }
+            }
+        }
+
+        return m;
+    }
+
+    private RegistryAccess registry() {
+        return registryAccess.aquire(() -> (RegistryAccess) getFor(RegistryAccess.Frozen.class, ((CraftServer) Bukkit.getServer()).getHandle().getServer()));
+    }
+
+    @Override
+    protected MapCodec<? extends BiomeSource> codec() {
+        throw new UnsupportedOperationException("Not supported");
+    }
+
+    @Override
+    public Holder<Biome> getNoiseBiome(int x, int y, int z, Climate.Sampler sampler) {
+        int m = (y - engine.getMinHeight()) << 2;
+        IrisBiome ib = engine.getComplex().getTrueBiomeStream().get(x << 2, z << 2);
+        if (ib.isCustom()) {
+            return customBiomes.get(ib.getCustomBiome(rng, x << 2, m, z << 2).getId());
+        } else {
+            org.bukkit.block.Biome v = ib.getSkyBiome(rng, x << 2, m, z << 2);
+            return NMSBinding.biomeToBiomeBase(biomeRegistry, v);
+        }
+    }
+}

nms/v1_20_R4/src/main/java/com/volmit/iris/core/nms/v1_20_R4/NMSBinding.java

@@ -0,0 +1,552 @@
+package com.volmit.iris.core.nms.v1_20_R4;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Vector;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import com.volmit.iris.core.nms.datapack.DataVersion;
+import net.minecraft.core.component.DataComponents;
+import net.minecraft.world.item.component.CustomData;
+import net.minecraft.world.level.chunk.status.ChunkStatus;
+import org.bukkit.*;
+import org.bukkit.block.Biome;
+import org.bukkit.block.data.BlockData;
+import org.bukkit.craftbukkit.v1_20_R4.CraftChunk;
+import org.bukkit.craftbukkit.v1_20_R4.CraftServer;
+import org.bukkit.craftbukkit.v1_20_R4.CraftWorld;
+import org.bukkit.craftbukkit.v1_20_R4.block.data.CraftBlockData;
+import org.bukkit.craftbukkit.v1_20_R4.entity.CraftDolphin;
+import org.bukkit.craftbukkit.v1_20_R4.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.v1_20_R4.util.CraftNamespacedKey;
+import org.bukkit.entity.Dolphin;
+import org.bukkit.entity.Entity;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.bukkit.generator.ChunkGenerator;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+import com.mojang.brigadier.exceptions.CommandSyntaxException;
+import com.volmit.iris.Iris;
+import com.volmit.iris.core.nms.INMSBinding;
+import com.volmit.iris.engine.data.cache.AtomicCache;
+import com.volmit.iris.engine.framework.Engine;
+import com.volmit.iris.util.collection.KList;
+import com.volmit.iris.util.collection.KMap;
+import com.volmit.iris.util.hunk.Hunk;
+import com.volmit.iris.util.json.JSONObject;
+import com.volmit.iris.util.mantle.Mantle;
+import com.volmit.iris.util.math.Vector3d;
+import com.volmit.iris.util.matter.MatterBiomeInject;
+import com.volmit.iris.util.nbt.io.NBTUtil;
+import com.volmit.iris.util.nbt.mca.NBTWorld;
+import com.volmit.iris.util.nbt.mca.palette.*;
+import com.volmit.iris.util.nbt.tag.CompoundTag;
+
+import it.unimi.dsi.fastutil.objects.Object2IntMap;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.Holder;
+import net.minecraft.core.Registry;
+import net.minecraft.core.RegistryAccess;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.nbt.NbtIo;
+import net.minecraft.nbt.TagParser;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.level.biome.BiomeSource;
+import net.minecraft.world.level.block.Block;
+import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.state.BlockState;
+import net.minecraft.world.level.chunk.ChunkAccess;
+import net.minecraft.world.level.chunk.LevelChunk;
+import sun.misc.Unsafe;
+
+public class NMSBinding implements INMSBinding {
+    private final KMap<Biome, Object> baseBiomeCache = new KMap<>();
+    private final BlockData AIR = Material.AIR.createBlockData();
+    private final AtomicCache<MCAIdMap<net.minecraft.world.level.biome.Biome>> biomeMapCache = new AtomicCache<>();
+    private final AtomicCache<MCAIdMapper<BlockState>> registryCache = new AtomicCache<>();
+    private final AtomicCache<MCAPalette<BlockState>> globalCache = new AtomicCache<>();
+    private final AtomicCache<RegistryAccess> registryAccess = new AtomicCache<>();
+    private final AtomicCache<Method> byIdRef = new AtomicCache<>();
+    private Field biomeStorageCache = null;
+
+    private static Object getFor(Class<?> type, Object source) {
+        Object o = fieldFor(type, source);
+
+        if (o != null) {
+            return o;
+        }
+
+        return invokeFor(type, source);
+    }
+
+    private static Object invokeFor(Class<?> returns, Object in) {
+        for (Method i : in.getClass().getMethods()) {
+            if (i.getReturnType().equals(returns)) {
+                i.setAccessible(true);
+                try {
+                    Iris.debug("[NMS] Found " + returns.getSimpleName() + " in " + in.getClass().getSimpleName() + "." + i.getName() + "()");
+                    return i.invoke(in);
+                } catch (Throwable e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+
+        return null;
+    }
+
+    private static Object fieldFor(Class<?> returns, Object in) {
+        return fieldForClass(returns, in.getClass(), in);
+    }
+
+    @SuppressWarnings("unchecked")
+    private static <T> T fieldForClass(Class<T> returnType, Class<?> sourceType, Object in) {
+        for (Field i : sourceType.getDeclaredFields()) {
+            if (i.getType().equals(returnType)) {
+                i.setAccessible(true);
+                try {
+                    Iris.debug("[NMS] Found " + returnType.getSimpleName() + " in " + sourceType.getSimpleName() + "." + i.getName());
+                    return (T) i.get(in);
+                } catch (IllegalAccessException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return null;
+    }
+
+    private static Class<?> getClassType(Class<?> type, int ordinal) {
+        return type.getDeclaredClasses()[ordinal];
+    }
+
+    @Override
+    public boolean hasTile(Location l) {
+        return ((CraftWorld) l.getWorld()).getHandle().getBlockEntity(new BlockPos(l.getBlockX(), l.getBlockY(), l.getBlockZ()), false) != null;
+    }
+
+    @Override
+    public CompoundTag serializeTile(Location location) {
+        BlockEntity e = ((CraftWorld) location.getWorld()).getHandle().getBlockEntity(new BlockPos(location.getBlockX(), location.getBlockY(), location.getBlockZ()), true);
+
+        if (e == null) {
+            return null;
+        }
+
+        net.minecraft.nbt.CompoundTag tag = e.saveWithFullMetadata(registry());
+        return convert(tag);
+    }
+
+    private CompoundTag convert(net.minecraft.nbt.CompoundTag tag) {
+        try {
+            ByteArrayOutputStream boas = new ByteArrayOutputStream();
+            DataOutputStream dos = new DataOutputStream(boas);
+            tag.write(dos);
+            dos.close();
+            return (CompoundTag) NBTUtil.read(new ByteArrayInputStream(boas.toByteArray()), false).getTag();
+        } catch (Throwable ex) {
+            ex.printStackTrace();
+        }
+
+        return null;
+    }
+
+    private net.minecraft.nbt.CompoundTag convert(CompoundTag tag) {
+        try {
+            ByteArrayOutputStream boas = new ByteArrayOutputStream();
+            NBTUtil.write(tag, boas, false);
+            DataInputStream din = new DataInputStream(new ByteArrayInputStream(boas.toByteArray()));
+            net.minecraft.nbt.CompoundTag c = NbtIo.read(din);
+            din.close();
+            return c;
+        } catch (Throwable e) {
+            e.printStackTrace();
+        }
+
+        return null;
+    }
+
+    @Override
+    public void deserializeTile(CompoundTag c, Location pos) {
+        ((CraftWorld) pos.getWorld()).getHandle().getChunkAt(new BlockPos(pos.getBlockX(), 0, pos.getBlockZ())).setBlockEntityNbt(convert(c));
+    }
+
+    @Override
+    public CompoundTag serializeEntity(Entity location) {
+        return null;// TODO:
+    }
+
+    @Override
+    public Entity deserializeEntity(CompoundTag s, Location newPosition) {
+        return null;// TODO:
+    }
+
+    @Override
+    public boolean supportsCustomHeight() {
+        return true;
+    }
+
+    private RegistryAccess registry() {
+        return registryAccess.aquire(() -> (RegistryAccess) getFor(RegistryAccess.Frozen.class, ((CraftServer) Bukkit.getServer()).getHandle().getServer()));
+    }
+
+    private Registry<net.minecraft.world.level.biome.Biome> getCustomBiomeRegistry() {
+        return registry().registry(Registries.BIOME).orElse(null);
+    }
+
+    private Registry<Block> getBlockRegistry() {
+        return registry().registry(Registries.BLOCK).orElse(null);
+    }
+
+    @Override
+    public Object getBiomeBaseFromId(int id) {
+        return getCustomBiomeRegistry().getHolder(id);
+    }
+
+    @Override
+    public int getMinHeight(World world) {
+        return world.getMinHeight();
+    }
+
+    @Override
+    public boolean supportsCustomBiomes() {
+        return true;
+    }
+
+    @Override
+    public int getTrueBiomeBaseId(Object biomeBase) {
+        return getCustomBiomeRegistry().getId(((Holder<net.minecraft.world.level.biome.Biome>) biomeBase).value());
+    }
+
+    @Override
+    public Object getTrueBiomeBase(Location location) {
+        return ((CraftWorld) location.getWorld()).getHandle().getBiome(new BlockPos(location.getBlockX(), location.getBlockY(), location.getBlockZ()));
+    }
+
+    @Override
+    public String getTrueBiomeBaseKey(Location location) {
+        return getKeyForBiomeBase(getTrueBiomeBase(location));
+    }
+
+    @Override
+    public Object getCustomBiomeBaseFor(String mckey) {
+        return getCustomBiomeRegistry().get(new ResourceLocation(mckey));
+    }
+
+    @Override
+    public Object getCustomBiomeBaseHolderFor(String mckey) {
+        return getCustomBiomeRegistry().getHolder(getTrueBiomeBaseId(getCustomBiomeRegistry().get(new ResourceLocation(mckey)))).get();
+    }
+
+    public int getBiomeBaseIdForKey(String key) {
+        return getCustomBiomeRegistry().getId(getCustomBiomeRegistry().get(new ResourceLocation(key)));
+    }
+
+    @Override
+    public String getKeyForBiomeBase(Object biomeBase) {
+        return getCustomBiomeRegistry().getKey((net.minecraft.world.level.biome.Biome) biomeBase).getPath(); // something, not something:something
+    }
+
+    @Override
+    public Object getBiomeBase(World world, Biome biome) {
+        return biomeToBiomeBase(((CraftWorld) world).getHandle()
+                .registryAccess().registry(Registries.BIOME).orElse(null), biome);
+    }
+
+    @Override
+    public Object getBiomeBase(Object registry, Biome biome) {
+        Object v = baseBiomeCache.get(biome);
+
+        if (v != null) {
+            return v;
+        }
+        //noinspection unchecked
+        v = biomeToBiomeBase((Registry<net.minecraft.world.level.biome.Biome>) registry, biome);
+        if (v == null) {
+            // Ok so there is this new biome name called "CUSTOM" in Paper's new releases.
+            // But, this does NOT exist within CraftBukkit which makes it return an error.
+            // So, we will just return the ID that the plains biome returns instead.
+            //noinspection unchecked
+            return biomeToBiomeBase((Registry<net.minecraft.world.level.biome.Biome>) registry, Biome.PLAINS);
+        }
+        baseBiomeCache.put(biome, v);
+        return v;
+    }
+
+    @Override
+    public KList<Biome> getBiomes() {
+        return new KList<>(Biome.values()).qadd(Biome.CHERRY_GROVE).qdel(Biome.CUSTOM);
+    }
+
+    @Override
+    public boolean isBukkit() {
+        return true;
+    }
+
+    @Override
+    public int getBiomeId(Biome biome) {
+        for (World i : Bukkit.getWorlds()) {
+            if (i.getEnvironment().equals(World.Environment.NORMAL)) {
+                Registry<net.minecraft.world.level.biome.Biome> registry = ((CraftWorld) i).getHandle().registryAccess().registry(Registries.BIOME).orElse(null);
+                return registry.getId((net.minecraft.world.level.biome.Biome) getBiomeBase(registry, biome));
+            }
+        }
+
+        return biome.ordinal();
+    }
+
+    private MCAIdMap<net.minecraft.world.level.biome.Biome> getBiomeMapping() {
+        return biomeMapCache.aquire(() -> new MCAIdMap<>() {
+            @NotNull
+            @Override
+            public Iterator<net.minecraft.world.level.biome.Biome> iterator() {
+                return getCustomBiomeRegistry().iterator();
+            }
+
+            @Override
+            public int getId(net.minecraft.world.level.biome.Biome paramT) {
+                return getCustomBiomeRegistry().getId(paramT);
+            }
+
+            @Override
+            public net.minecraft.world.level.biome.Biome byId(int paramInt) {
+                return (net.minecraft.world.level.biome.Biome) getBiomeBaseFromId(paramInt);
+            }
+        });
+    }
+
+    @NotNull
+    private MCABiomeContainer getBiomeContainerInterface(MCAIdMap<net.minecraft.world.level.biome.Biome> biomeMapping, MCAChunkBiomeContainer<net.minecraft.world.level.biome.Biome> base) {
+        return new MCABiomeContainer() {
+            @Override
+            public int[] getData() {
+                return base.writeBiomes();
+            }
+
+            @Override
+            public void setBiome(int x, int y, int z, int id) {
+                base.setBiome(x, y, z, biomeMapping.byId(id));
+            }
+
+            @Override
+            public int getBiome(int x, int y, int z) {
+                return biomeMapping.getId(base.getBiome(x, y, z));
+            }
+        };
+    }
+
+    @Override
+    public MCABiomeContainer newBiomeContainer(int min, int max) {
+        MCAChunkBiomeContainer<net.minecraft.world.level.biome.Biome> base = new MCAChunkBiomeContainer<>(getBiomeMapping(), min, max);
+        return getBiomeContainerInterface(getBiomeMapping(), base);
+    }
+
+    @Override
+    public MCABiomeContainer newBiomeContainer(int min, int max, int[] data) {
+        MCAChunkBiomeContainer<net.minecraft.world.level.biome.Biome> base = new MCAChunkBiomeContainer<>(getBiomeMapping(), min, max, data);
+        return getBiomeContainerInterface(getBiomeMapping(), base);
+    }
+
+    @Override
+    public int countCustomBiomes() {
+        AtomicInteger a = new AtomicInteger(0);
+
+        getCustomBiomeRegistry().keySet().forEach((i) -> {
+            if (i.getNamespace().equals("minecraft")) {
+                return;
+            }
+
+            a.incrementAndGet();
+            Iris.debug("Custom Biome: " + i);
+        });
+
+        return a.get();
+    }
+
+    public boolean supportsDataPacks() {
+        return true;
+    }
+
+    public void setBiomes(int cx, int cz, World world, Hunk<Object> biomes) {
+        LevelChunk c = ((CraftWorld) world).getHandle().getChunk(cx, cz);
+        biomes.iterateSync((x, y, z, b) -> c.setBiome(x, y, z, (Holder<net.minecraft.world.level.biome.Biome>) b));
+        c.setUnsaved(true);
+    }
+
+    @Override
+    public void forceBiomeInto(int x, int y, int z, Object somethingVeryDirty, ChunkGenerator.BiomeGrid chunk) {
+        try {
+            ChunkAccess s = (ChunkAccess) getFieldForBiomeStorage(chunk).get(chunk);
+            Holder<net.minecraft.world.level.biome.Biome> biome = (Holder<net.minecraft.world.level.biome.Biome>) somethingVeryDirty;
+            s.setBiome(x, y, z, biome);
+        } catch (IllegalAccessException e) {
+            Iris.reportError(e);
+            e.printStackTrace();
+        }
+    }
+
+    private Field getFieldForBiomeStorage(Object storage) {
+        Field f = biomeStorageCache;
+
+        if (f != null) {
+            return f;
+        }
+        try {
+            f = storage.getClass().getDeclaredField("biome");
+            f.setAccessible(true);
+            return f;
+        } catch (Throwable e) {
+            Iris.reportError(e);
+            e.printStackTrace();
+            Iris.error(storage.getClass().getCanonicalName());
+        }
+
+        biomeStorageCache = f;
+        return null;
+    }
+
+    @Override
+    public MCAPaletteAccess createPalette() {
+        MCAIdMapper<BlockState> registry = registryCache.aquireNasty(() -> {
+            Field cf = net.minecraft.core.IdMapper.class.getDeclaredField("tToId");
+            Field df = net.minecraft.core.IdMapper.class.getDeclaredField("idToT");
+            Field bf = net.minecraft.core.IdMapper.class.getDeclaredField("nextId");
+            cf.setAccessible(true);
+            df.setAccessible(true);
+            bf.setAccessible(true);
+            net.minecraft.core.IdMapper<BlockState> blockData = Block.BLOCK_STATE_REGISTRY;
+            int b = bf.getInt(blockData);
+            Object2IntMap<BlockState> c = (Object2IntMap<BlockState>) cf.get(blockData);
+            List<BlockState> d = (List<BlockState>) df.get(blockData);
+            return new MCAIdMapper<BlockState>(c, d, b);
+        });
+        MCAPalette<BlockState> global = globalCache.aquireNasty(() -> new MCAGlobalPalette<>(registry, ((CraftBlockData) AIR).getState()));
+        MCAPalettedContainer<BlockState> container = new MCAPalettedContainer<>(global, registry,
+                i -> ((CraftBlockData) NBTWorld.getBlockData(i)).getState(),
+                i -> NBTWorld.getCompound(CraftBlockData.fromData(i)),
+                ((CraftBlockData) AIR).getState());
+        return new MCAWrappedPalettedContainer<>(container,
+                i -> NBTWorld.getCompound(CraftBlockData.fromData(i)),
+                i -> ((CraftBlockData) NBTWorld.getBlockData(i)).getState());
+    }
+
+    @Override
+    public void injectBiomesFromMantle(Chunk e, Mantle mantle) {
+        ChunkAccess chunk = ((CraftChunk) e).getHandle(ChunkStatus.FULL);
+        AtomicInteger c = new AtomicInteger();
+        AtomicInteger r = new AtomicInteger();
+        mantle.iterateChunk(e.getX(), e.getZ(), MatterBiomeInject.class, (x, y, z, b) -> {
+            if (b != null) {
+                if (b.isCustom()) {
+                    chunk.setBiome(x, y, z, getCustomBiomeRegistry().getHolder(b.getBiomeId()).get());
+                    c.getAndIncrement();
+                } else {
+                    chunk.setBiome(x, y, z, (Holder<net.minecraft.world.level.biome.Biome>) getBiomeBase(e.getWorld(), b.getBiome()));
+                    r.getAndIncrement();
+                }
+            }
+        });
+    }
+
+    public ItemStack applyCustomNbt(ItemStack itemStack, KMap<String, Object> customNbt) throws IllegalArgumentException {
+        if (customNbt != null && !customNbt.isEmpty()) {
+            net.minecraft.world.item.ItemStack s = CraftItemStack.asNMSCopy(itemStack);
+
+            try {
+                net.minecraft.nbt.CompoundTag tag = TagParser.parseTag((new JSONObject(customNbt)).toString());
+                tag.merge(s.getOrDefault(DataComponents.CUSTOM_DATA, CustomData.EMPTY).getUnsafe());
+                s.set(DataComponents.CUSTOM_DATA, CustomData.of(tag));
+            } catch (CommandSyntaxException var5) {
+                throw new IllegalArgumentException(var5);
+            }
+
+            return CraftItemStack.asBukkitCopy(s);
+        } else {
+            return itemStack;
+        }
+    }
+
+    public void setTreasurePos(Dolphin dolphin, com.volmit.iris.core.nms.container.BlockPos pos) {
+        CraftDolphin cd = (CraftDolphin)dolphin;
+        cd.getHandle().setTreasurePos(new BlockPos(pos.getX(), pos.getY(), pos.getZ()));
+        cd.getHandle().setGotFish(true);
+    }
+
+    public void inject(long seed, Engine engine, World world) throws NoSuchFieldException, IllegalAccessException {
+        ServerLevel serverLevel = ((CraftWorld)world).getHandle();
+        Class<?> clazz = serverLevel.getChunkSource().chunkMap.generator.getClass();
+        Field biomeSource = getField(clazz, BiomeSource.class);
+        biomeSource.setAccessible(true);
+        Field unsafeField = Unsafe.class.getDeclaredField("theUnsafe");
+        unsafeField.setAccessible(true);
+        Unsafe unsafe = (Unsafe)unsafeField.get(null);
+        CustomBiomeSource customBiomeSource = new CustomBiomeSource(seed, engine, world);
+        unsafe.putObject(biomeSource.get(serverLevel.getChunkSource().chunkMap.generator), unsafe.objectFieldOffset(biomeSource), customBiomeSource);
+        biomeSource.set(serverLevel.getChunkSource().chunkMap.generator, customBiomeSource);
+    }
+
+    public Vector3d getBoundingbox(org.bukkit.entity.EntityType entity) {
+        Field[] fields = EntityType.class.getDeclaredFields();
+        for (Field field : fields) {
+            if (Modifier.isStatic(field.getModifiers()) && field.getType().equals(EntityType.class)) {
+                try {
+                    EntityType entityType = (EntityType) field.get(null);
+                    if (entityType.getDescriptionId().equals("entity.minecraft." + entity.name().toLowerCase())) {
+                        Vector<Float> v1 = new Vector<>();
+                        v1.add(entityType.getHeight());
+                        entityType.getDimensions();
+                        Vector3d box = new Vector3d( entityType.getWidth(), entityType.getHeight(),  entityType.getWidth());
+                        //System.out.println("Entity Type: " + entityType.getDescriptionId() + ", " + "Height: " + height + ", Width: " + width);
+                        return box;
+                    }
+                } catch (IllegalAccessException e) {
+                    Iris.error("Unable to get entity dimensions!");
+                    e.printStackTrace();
+                }
+            }
+        }
+        return null;
+    }
+
+
+    @Override
+    public Entity spawnEntity(Location location,  org.bukkit.entity.EntityType type, CreatureSpawnEvent.SpawnReason reason) {
+        return ((CraftWorld) location.getWorld()).spawn(location, type.getEntityClass(), null, reason);
+    }
+
+    private static Field getField(Class<?> clazz, Class<?> fieldType) throws NoSuchFieldException {
+        try {
+            for (Field f : clazz.getDeclaredFields()) {
+                if (f.getType().equals(fieldType))
+                    return f;
+            }
+            throw new NoSuchFieldException(fieldType.getName());
+        } catch (NoSuchFieldException var4) {
+            Class<?> superClass = clazz.getSuperclass();
+            if (superClass == null) {
+                throw var4;
+            } else {
+                return getField(superClass, fieldType);
+            }
+        }
+    }
+
+    public static Holder<net.minecraft.world.level.biome.Biome> biomeToBiomeBase(Registry<net.minecraft.world.level.biome.Biome> registry, Biome biome) {
+        return registry.getHolderOrThrow(ResourceKey.create(Registries.BIOME, CraftNamespacedKey.toMinecraft(biome.getKey())));
+    }
+
+    @Override
+    public DataVersion getDataVersion() {
+        return DataVersion.V1205;
+    }
+}

settings.gradle

@@ -26,6 +26,7 @@ rootProject.name = 'Iris'
 include 'app', 'com.volmit.gui'
 include(':core')
 include(
+        ':nms:v1_20_R4',
         ':nms:v1_20_R3',
         ':nms:v1_20_R2',
         ':nms:v1_20_R1',