diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
index 67989e57a..d05d6ff8c 100644
--- a/.idea/jarRepositories.xml
+++ b/.idea/jarRepositories.xml
@@ -6,6 +6,11 @@
       <option name="name" value="Central Repository" />
       <option name="url" value="https://repo.maven.apache.org/maven2" />
     </remote-repository>
+    <remote-repository>
+      <option name="id" value="papermc" />
+      <option name="name" value="papermc" />
+      <option name="url" value="https://papermc.io/repo/repository/maven-public/" />
+    </remote-repository>
     <remote-repository>
       <option name="id" value="parsii.local" />
       <option name="name" value="parsii" />
diff --git a/pom.xml b/pom.xml
index 3bf17e955..806ee36fb 100644
--- a/pom.xml
+++ b/pom.xml
@@ -58,6 +58,10 @@
                             <pattern>parsii</pattern>
                             <shadedPattern>com.dfsek.terra.lib.parsii</shadedPattern>
                         </relocation>
+                        <relocation>
+                            <pattern>io.papermc.lib</pattern>
+                            <shadedPattern>com.dfsek.terra.lib.paperlib</shadedPattern> <!-- Replace this -->
+                        </relocation>
                     </relocations>
                 </configuration>
                 <executions>
@@ -88,6 +92,10 @@
             <id>CodeMC</id>
             <url>https://repo.codemc.org/repository/maven-public</url>
         </repository>
+        <repository>
+            <id>papermc</id>
+            <url>https://papermc.io/repo/repository/maven-public/</url>
+        </repository>
     </repositories>
 
     <dependencies>
@@ -149,6 +157,12 @@
             <artifactId>parsii</artifactId>
             <version>1.2</version>
         </dependency>
+        <dependency>
+            <groupId>io.papermc</groupId>
+            <artifactId>paperlib</artifactId>
+            <version>1.0.5</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 
 </project>
\ No newline at end of file
diff --git a/src/main/java/com/dfsek/terra/Terra.java b/src/main/java/com/dfsek/terra/Terra.java
index 8adab9176..9660ca720 100644
--- a/src/main/java/com/dfsek/terra/Terra.java
+++ b/src/main/java/com/dfsek/terra/Terra.java
@@ -5,6 +5,7 @@ import com.dfsek.terra.config.base.ConfigUtil;
 import com.dfsek.terra.config.base.WorldConfig;
 import com.dfsek.terra.config.lang.LangUtil;
 import com.dfsek.terra.generation.TerraChunkGenerator;
+import com.dfsek.terra.util.PaperUtil;
 import org.bstats.bukkit.Metrics;
 import org.bukkit.Bukkit;
 import org.bukkit.World;
@@ -52,6 +53,7 @@ public class Terra extends GaeaPlugin {
         saveDefaultConfig();
         Bukkit.getScheduler().scheduleAsyncRepeatingTask(this, TerraChunkGenerator::saveAll, ConfigUtil.dataSave, ConfigUtil.dataSave);
         Bukkit.getPluginManager().registerEvents(new EventListener(this), this);
+        PaperUtil.checkPaper(this);
     }
 
     @Override
diff --git a/src/main/java/com/dfsek/terra/event/OreVeinGenerateEvent.java b/src/main/java/com/dfsek/terra/event/OreVeinGenerateEvent.java
new file mode 100644
index 000000000..fce87d295
--- /dev/null
+++ b/src/main/java/com/dfsek/terra/event/OreVeinGenerateEvent.java
@@ -0,0 +1,34 @@
+package com.dfsek.terra.event;
+
+import com.dfsek.terra.TerraWorld;
+import com.dfsek.terra.config.genconfig.OreConfig;
+import org.bukkit.Location;
+import org.bukkit.event.Cancellable;
+
+public class OreVeinGenerateEvent extends TerraWorldEvent implements Cancellable {
+    private boolean cancelled;
+    private OreConfig config;
+
+    public OreVeinGenerateEvent(TerraWorld tw, Location l,  OreConfig config) {
+        super(tw, l);
+        this.config = config;
+    }
+
+    public void setConfig(OreConfig config) {
+        this.config = config;
+    }
+
+    public OreConfig getConfig() {
+        return config;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+}
diff --git a/src/main/java/com/dfsek/terra/event/TerraWorldEvent.java b/src/main/java/com/dfsek/terra/event/TerraWorldEvent.java
new file mode 100644
index 000000000..4c42c5331
--- /dev/null
+++ b/src/main/java/com/dfsek/terra/event/TerraWorldEvent.java
@@ -0,0 +1,37 @@
+package com.dfsek.terra.event;
+
+import com.dfsek.terra.TerraWorld;
+import org.bukkit.Location;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+public abstract class TerraWorldEvent extends Event {
+    private static final HandlerList HANDLERS = new HandlerList();
+    private final TerraWorld world;
+    private final Location location;
+
+    public TerraWorldEvent(TerraWorld tw, Location l) {
+        this.world = tw;
+        this.location = l.clone();
+    }
+
+    @Override
+    @NotNull
+    public HandlerList getHandlers() {
+        return HANDLERS;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return HANDLERS;
+    }
+
+    public TerraWorld getWorld() {
+        return world;
+    }
+
+    public Location getLocation() {
+        return location;
+    }
+}
diff --git a/src/main/java/com/dfsek/terra/event/TreeGenerateEvent.java b/src/main/java/com/dfsek/terra/event/TreeGenerateEvent.java
new file mode 100644
index 000000000..ee03c2298
--- /dev/null
+++ b/src/main/java/com/dfsek/terra/event/TreeGenerateEvent.java
@@ -0,0 +1,35 @@
+package com.dfsek.terra.event;
+
+import com.dfsek.terra.TerraWorld;
+import com.dfsek.terra.config.genconfig.TreeConfig;
+import org.bukkit.Location;
+import org.bukkit.event.Cancellable;
+import org.polydev.gaea.tree.Tree;
+
+public class TreeGenerateEvent extends TerraWorldEvent implements Cancellable {
+    private boolean cancelled;
+    private Tree tree;
+
+    public TreeGenerateEvent(TerraWorld tw, Location l, Tree tree) {
+        super(tw, l);
+        this.tree = tree;
+    }
+
+    public void setTree(Tree tree) {
+        this.tree = tree;
+    }
+
+    public Tree getTree() {
+        return tree;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(boolean cancel) {
+        this.cancelled = cancel;
+    }
+}
diff --git a/src/main/java/com/dfsek/terra/events/OreVeinGenerateEvent.java b/src/main/java/com/dfsek/terra/events/OreVeinGenerateEvent.java
deleted file mode 100644
index 04ba5ee44..000000000
--- a/src/main/java/com/dfsek/terra/events/OreVeinGenerateEvent.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.dfsek.terra.events;
-
-public class OreVeinGenerateEvent {
-}
diff --git a/src/main/java/com/dfsek/terra/events/TerraStructureLocateEvent.java b/src/main/java/com/dfsek/terra/events/TerraStructureLocateEvent.java
deleted file mode 100644
index 6b25e85a5..000000000
--- a/src/main/java/com/dfsek/terra/events/TerraStructureLocateEvent.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.dfsek.terra.events;
-
-public class TerraStructureLocateEvent {
-}
diff --git a/src/main/java/com/dfsek/terra/events/TreeGenerateEvent.java b/src/main/java/com/dfsek/terra/events/TreeGenerateEvent.java
deleted file mode 100644
index d2875f5fa..000000000
--- a/src/main/java/com/dfsek/terra/events/TreeGenerateEvent.java
+++ /dev/null
@@ -1,4 +0,0 @@
-package com.dfsek.terra.events;
-
-public class TreeGenerateEvent {
-}
diff --git a/src/main/java/com/dfsek/terra/population/FloraPopulator.java b/src/main/java/com/dfsek/terra/population/FloraPopulator.java
index fc3e93c37..23784da97 100644
--- a/src/main/java/com/dfsek/terra/population/FloraPopulator.java
+++ b/src/main/java/com/dfsek/terra/population/FloraPopulator.java
@@ -8,8 +8,11 @@ import com.dfsek.terra.biome.UserDefinedBiome;
 import com.dfsek.terra.config.base.ConfigPack;
 import com.dfsek.terra.config.genconfig.biome.BiomeConfig;
 import com.dfsek.terra.config.genconfig.biome.BiomeFloraConfig;
+import com.dfsek.terra.event.TreeGenerateEvent;
 import com.dfsek.terra.generation.UserDefinedDecorator;
+import org.bukkit.Bukkit;
 import org.bukkit.Chunk;
+import org.bukkit.Location;
 import org.bukkit.World;
 import org.bukkit.block.Block;
 import org.jetbrains.annotations.NotNull;
@@ -34,6 +37,8 @@ public class FloraPopulator extends GaeaBlockPopulator {
         try (ProfileFuture ignored = TerraProfiler.fromWorld(world).measure("FloraTime")) {
             TerraWorld tw = TerraWorld.getWorld(world);
             if(!tw.isSafe()) return;
+            int originX = chunk.getX() << 4;
+            int originZ = chunk.getZ() << 4;
             TerraBiomeGrid grid = tw.getGrid();
             ConfigPack config = tw.getConfig();
             for(int x = 0; x < 16; x++) {
@@ -42,7 +47,9 @@ public class FloraPopulator extends GaeaBlockPopulator {
                     if((x & 1) == 0 && (z & 1) == 0) {
                         int treeChance = biome.getDecorator().getTreeDensity();
                         if(random.nextInt(1000) < treeChance) {
-                            if(doTrees(biome, tw, random, chunk, offset(random, x), offset(random, z))) continue;
+                            int xt = offset(random, x);
+                            int zt = offset(random, z);
+                            if(doTrees(biome, tw, random, chunk, xt, zt)) continue;
                         }
                     }
                     if(biome.getDecorator().getFloraChance() <= 0) continue;
@@ -51,7 +58,7 @@ public class FloraPopulator extends GaeaBlockPopulator {
                         BiomeFloraConfig f = c.getFlora();
                         for(int i = 0; i < f.getFloraAttempts(); i++) {
                             Flora item;
-                            if(f.isFloraSimplex()) item = biome.getDecorator().getFlora().get(f.getFloraNoise(), (chunk.getX() << 4) + x, (chunk.getZ() << 4) + z);
+                            if(f.isFloraSimplex()) item = biome.getDecorator().getFlora().get(f.getFloraNoise(), originX + x, originZ + z);
                             else item = biome.getDecorator().getFlora().get(random);
                             for(Block highest : item.getValidSpawnsAt(chunk, x, z, c.getFloraHeights(item))) {
                                 if(random.nextInt(100) < biome.getDecorator().getFloraChance())
@@ -69,7 +76,10 @@ public class FloraPopulator extends GaeaBlockPopulator {
             Range range = world.getConfig().getBiome(biome).getTreeRange(tree);
             if(!range.isInRange(block.getY())) continue;
             try {
-                return tree.plant(block.getLocation(), random, Terra.getInstance());
+                Location l = block.getLocation();
+                TreeGenerateEvent event = new TreeGenerateEvent(world, l, tree);
+                Bukkit.getPluginManager().callEvent(event);
+                if(!event.isCancelled()) tree.plant(l, random, Terra.getInstance());
             } catch(NullPointerException ignore) {}
         }
         return false;
diff --git a/src/main/java/com/dfsek/terra/population/OrePopulator.java b/src/main/java/com/dfsek/terra/population/OrePopulator.java
index 1bbc6feeb..dfa22d891 100644
--- a/src/main/java/com/dfsek/terra/population/OrePopulator.java
+++ b/src/main/java/com/dfsek/terra/population/OrePopulator.java
@@ -3,6 +3,8 @@ package com.dfsek.terra.population;
 import com.dfsek.terra.TerraWorld;
 import com.dfsek.terra.config.base.ConfigPack;
 import com.dfsek.terra.config.genconfig.biome.BiomeOreConfig;
+import com.dfsek.terra.event.OreVeinGenerateEvent;
+import org.bukkit.Bukkit;
 import org.bukkit.util.Vector;
 import org.polydev.gaea.math.Range;
 import com.dfsek.terra.TerraProfiler;
@@ -30,13 +32,20 @@ public class OrePopulator extends GaeaBlockPopulator {
             BiomeOreConfig ores = config.getBiome((UserDefinedBiome) b).getOres();
             for(Map.Entry<OreConfig, Range> e : ores.getOres().entrySet()) {
                 int num = e.getValue().get(random);
-                int edgeOffset = e.getKey().getChunkEdgeOffset();
+                OreConfig ore = e.getKey();
+                int edgeOffset = ore.getChunkEdgeOffset();
                 for(int i = 0; i < num; i++) {
                     int x = random.nextInt(16 - edgeOffset*2) + edgeOffset;
                     int z = random.nextInt(16 - edgeOffset*2) + edgeOffset;
-                    int y = ores.getOreHeights().get(e.getKey()).get(random);
-                    if(e.getKey().crossChunks()) e.getKey().doVein(new Vector(x, y, z), chunk, random);
-                    else e.getKey().doVeinSingle(new Vector(x, y, z), chunk, random);
+                    int y = ores.getOreHeights().get(ore).get(random);
+
+                    Vector v = new Vector(x, y, z);
+                    OreVeinGenerateEvent event = new OreVeinGenerateEvent(tw, v.toLocation(world), ore);
+                    Bukkit.getPluginManager().callEvent(event);
+                    if(! event.isCancelled()) {
+                        if(ore.crossChunks()) ore.doVein(v, chunk, random);
+                        else ore.doVeinSingle(new Vector(x, y, z), chunk, random);
+                    }
                 }
             }
         }
diff --git a/src/main/java/com/dfsek/terra/util/DataUtil.java b/src/main/java/com/dfsek/terra/util/DataUtil.java
index 05c617379..546acbad3 100644
--- a/src/main/java/com/dfsek/terra/util/DataUtil.java
+++ b/src/main/java/com/dfsek/terra/util/DataUtil.java
@@ -7,7 +7,7 @@ import org.polydev.gaea.world.palette.RandomPalette;
 
 import java.util.Random;
 
-public class DataUtil {
+public final class DataUtil {
     public static final BlockData STONE = Material.STONE.createBlockData();
     public static final BlockData SNOW = Material.SNOW.createBlockData();
     public static final BlockData WATER = Material.WATER.createBlockData();
diff --git a/src/main/java/com/dfsek/terra/util/PaperUtil.java b/src/main/java/com/dfsek/terra/util/PaperUtil.java
new file mode 100644
index 000000000..55fafc07f
--- /dev/null
+++ b/src/main/java/com/dfsek/terra/util/PaperUtil.java
@@ -0,0 +1,18 @@
+package com.dfsek.terra.util;
+
+import com.dfsek.terra.config.lang.LangUtil;
+import io.papermc.lib.PaperLib;
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import java.util.logging.Level;
+
+public final class PaperUtil {
+    public static void checkPaper(JavaPlugin main) {
+        Bukkit.getScheduler().scheduleSyncDelayedTask(main, () -> {
+            if(!PaperLib.isPaper()) {
+                LangUtil.log("use-paper", Level.WARNING);
+            }
+        }, 100L);
+    }
+}
diff --git a/src/main/java/com/dfsek/terra/util/structure/RotationUtil.java b/src/main/java/com/dfsek/terra/util/structure/RotationUtil.java
index df089662f..421cc707a 100644
--- a/src/main/java/com/dfsek/terra/util/structure/RotationUtil.java
+++ b/src/main/java/com/dfsek/terra/util/structure/RotationUtil.java
@@ -5,10 +5,10 @@ import com.dfsek.terra.structure.Structure;
 import org.bukkit.block.BlockFace;
 import org.bukkit.block.data.Rail;
 
-public class RotationUtil {
+public final class RotationUtil {
     /**
      * Rotate and mirror a coordinate pair.
-     * @param arr Array containing X and Z coordinates.
+     * @param orig Vector to rotate.
      * @param r Rotation
      * @return Rotated coordinate pair
      */
diff --git a/src/main/java/com/dfsek/terra/util/structure/WorldEditUtil.java b/src/main/java/com/dfsek/terra/util/structure/WorldEditUtil.java
index af3928368..97e9fe151 100644
--- a/src/main/java/com/dfsek/terra/util/structure/WorldEditUtil.java
+++ b/src/main/java/com/dfsek/terra/util/structure/WorldEditUtil.java
@@ -11,7 +11,7 @@ import org.bukkit.Location;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.Plugin;
 
-public class WorldEditUtil {
+public final class WorldEditUtil {
     public static WorldEditPlugin getWorldEdit() {
         Plugin p = Bukkit.getServer().getPluginManager().getPlugin("WorldEdit");
         if (p instanceof WorldEditPlugin) return (WorldEditPlugin) p;
diff --git a/src/main/resources/lang/en_us.yml b/src/main/resources/lang/en_us.yml
index f5de07a94..403598e1a 100644
--- a/src/main/resources/lang/en_us.yml
+++ b/src/main/resources/lang/en_us.yml
@@ -106,4 +106,11 @@ warning:
 error:
   severe-config: "A severe configuration error has prevented Terra from properly generating terrain at coordinates: %1$s, %2$s. Please check your configuration for errors. Any config errors will have been reported above."
 debug:
-  data-save: "Saved population data for world \"%s\""
\ No newline at end of file
+  data-save: "Saved population data for world \"%s\""
+use-paper:
+  - "You appear to be using Spigot/CraftBukkit."
+  - "While Terra &odoes&r work on Spigot, some functionality will be lost. (Terra is untested on CraftBukkit; no support will be given for CraftBukkit)."
+  - "To get the most out of Terra, please switch to Paper."
+  - "Plus, Paper offers immense performance improvements over Spigot, and all Spigot plugins should work with Paper!"
+  - "To have the best experience with Terra, and all your plugins, please use Paper."
+  - "Find out more on Paper's website: https://papermc.io/"
\ No newline at end of file