diff --git a/adapters/fabric/build.gradle b/adapters/fabric/build.gradle
index 8127265c4..f5aefa5e2 100644
--- a/adapters/fabric/build.gradle
+++ b/adapters/fabric/build.gradle
@@ -181,6 +181,8 @@ dependencies {
         fabricApi = ((Map<String, String>) irisModTarget.fabricModules).collect { String module, String moduleVersion ->
             "net.fabricmc.fabric-api:${module}:${moduleVersion}".toString()
         }
+    }
+    if (irisModTarget.fabricPermissions != null) {
         fabricApi.add("me.lucko:fabric-permissions-api:${irisModTarget.fabricPermissions}".toString())
     }
     fabricApi.each { Object notation ->
@@ -296,6 +298,8 @@ if (irisModTarget.fabricModules != null) {
     nestedFabricApiJars = ((Map<String, String>) irisModTarget.fabricModules).collectEntries { String module, String ignored ->
         [(module): "${module}.jar".toString()]
     }
+}
+if (irisModTarget.fabricPermissions != null) {
     nestedFabricApiJars.put('fabric-permissions-api', 'fabric-permissions-api.jar')
 }
 
diff --git a/adapters/forge/build.gradle b/adapters/forge/build.gradle
index cae2321dd..8aa91b5a8 100644
--- a/adapters/forge/build.gradle
+++ b/adapters/forge/build.gradle
@@ -263,8 +263,9 @@ tasks.named('test').configure {
 processResources {
     inputs.property('version', irisVersion)
     inputs.property('minecraftVersion', minecraftVersion)
+    inputs.property('loaderRange', irisModTarget.forgeRange.toString())
     filesMatching('META-INF/mods.toml') {
-        expand('version': irisVersion, 'minecraftVersion': minecraftVersion)
+        expand('version': irisVersion, 'minecraftVersion': minecraftVersion, 'loaderRange': irisModTarget.forgeRange.toString())
     }
 }
 
diff --git a/adapters/forge/src/main/resources/META-INF/mods.toml b/adapters/forge/src/main/resources/META-INF/mods.toml
index 0c267e564..a3977a361 100644
--- a/adapters/forge/src/main/resources/META-INF/mods.toml
+++ b/adapters/forge/src/main/resources/META-INF/mods.toml
@@ -1,5 +1,5 @@
 modLoader = "javafml"
-loaderVersion = "[66,67)"
+loaderVersion = "${loaderRange}"
 license = "GPL-3.0"
 issueTrackerURL = "https://github.com/VolmitSoftware/Iris/issues"
 
@@ -16,7 +16,7 @@ logoFile = "assets/irisworldgen/icon.png"
 [[dependencies.irisworldgen]]
 modId = "forge"
 mandatory = true
-versionRange = "[66,67)"
+versionRange = "${loaderRange}"
 ordering = "NONE"
 side = "BOTH"
 
diff --git a/adapters/neoforge/build.gradle b/adapters/neoforge/build.gradle
index cd92352f8..7343c7031 100644
--- a/adapters/neoforge/build.gradle
+++ b/adapters/neoforge/build.gradle
@@ -264,8 +264,9 @@ tasks.named('test').configure {
 processResources {
     inputs.property('version', irisVersion)
     inputs.property('minecraftVersion', minecraftVersion)
+    inputs.property('loaderRange', irisModTarget.neoForgeRange.toString())
     filesMatching('META-INF/neoforge.mods.toml') {
-        expand('version': irisVersion, 'minecraftVersion': minecraftVersion)
+        expand('version': irisVersion, 'minecraftVersion': minecraftVersion, 'loaderRange': irisModTarget.neoForgeRange.toString())
     }
 }
 
diff --git a/adapters/neoforge/src/main/resources/META-INF/neoforge.mods.toml b/adapters/neoforge/src/main/resources/META-INF/neoforge.mods.toml
index a65393071..fbf789f52 100644
--- a/adapters/neoforge/src/main/resources/META-INF/neoforge.mods.toml
+++ b/adapters/neoforge/src/main/resources/META-INF/neoforge.mods.toml
@@ -25,7 +25,7 @@ logoFile = "assets/irisworldgen/icon.png"
 [[dependencies.irisworldgen]]
 modId = "neoforge"
 type = "required"
-versionRange = "[26.3.0.65-beta,26.4)"
+versionRange = "${loaderRange}"
 ordering = "NONE"
 side = "BOTH"
 
diff --git a/gradle/mod-target.gradle b/gradle/mod-target.gradle
index bc882bbe7..384fea748 100644
--- a/gradle/mod-target.gradle
+++ b/gradle/mod-target.gradle
@@ -8,6 +8,9 @@ Map<String, Object> target = targets.get(targetMinecraft)
 if (target == null) {
     throw new GradleException("Unsupported Iris mod target ${targetMinecraft}; choose ${targets.keySet().join(', ')}")
 }
+targets.each { String minecraft, Map<String, Object> candidate ->
+    candidate.put('overlays', candidate.get('overlays') ?: [minecraft])
+}
 ext.irisModTarget = target
 ext.irisModTargets = targets
 if (project.name.startsWith('iris-')) {
diff --git a/gradle/mod-targets.json b/gradle/mod-targets.json
index 3769a2540..e1df32669 100644
--- a/gradle/mod-targets.json
+++ b/gradle/mod-targets.json
@@ -4,7 +4,9 @@
     "fabricRemap": true,
     "fabricLoader": "0.19.5",
     "forge": "1.21.1-52.1.20",
+    "forgeRange": "[52,53)",
     "neoForge": "21.1.262",
+    "neoForgeRange": "[21.1,21.2)",
     "nativeAccess": "minecraft1_21_1",
     "fabricModules": {
       "fabric-api-base": "0.4.42+6573ed8c19",
@@ -25,7 +27,9 @@
     "fabricRemap": false,
     "fabricLoader": "0.19.5",
     "forge": "26.3-66.0.8",
+    "forgeRange": "[66,67)",
     "neoForge": "26.3.0.83",
+    "neoForgeRange": "[26.3.0.65-beta,26.4)",
     "nativeAccess": "minecraft26_2",
     "slf4j": "2.0.17"
   }
diff --git a/gradle/modded-version-sources.gradle b/gradle/modded-version-sources.gradle
index c0ad7dba9..b0556f577 100644
--- a/gradle/modded-version-sources.gradle
+++ b/gradle/modded-version-sources.gradle
@@ -1,6 +1,6 @@
 import groovy.json.JsonSlurper
 
-String sourceMinecraftVersion = providers.gradleProperty('minecraftVersion').getOrElse('26.3')
+List<String> sourceOverlays = (List<String>) irisModTarget.overlays
 List<File> adapterSourceRoots = [projectDir, file('../modded-common'), file('../client-common')]
 
 tasks.named('compileTestJava', JavaCompile).configure {
@@ -12,20 +12,33 @@ tasks.withType(Test).configureEach {
     })
 }
 
-['java', 'resources'].each { String kind ->
-    List<File> overlays = adapterSourceRoots.collect { File adapter ->
-        new File(adapter, "src/versions/${sourceMinecraftVersion}/${kind}")
+Closure<List<File>> overlayDirectories = { File adapter, String kind ->
+    sourceOverlays.collect { String overlay -> new File(adapter, "src/versions/${overlay}/${kind}") }
+}
+Closure<Integer> overlayOrigin = { List<File> overlays, String path ->
+    for (int index = overlays.size() - 1; index >= 0; index--) {
+        if (new File(overlays.get(index), path).isFile()) {
+            return index
+        }
     }
-    if (!overlays.any { File directory -> directory.isDirectory() }) {
+    return -1
+}
+
+['java', 'resources'].each { String kind ->
+    if (!adapterSourceRoots.any { File adapter -> overlayDirectories(adapter, kind).any { File directory -> directory.isDirectory() } }) {
         return
     }
     TaskProvider<Sync> prepareSources = tasks.register("prepareVersion${kind.capitalize()}", Sync) {
         adapterSourceRoots.each { File adapter ->
-            File overlay = new File(adapter, "src/versions/${sourceMinecraftVersion}/${kind}")
+            List<File> overlays = overlayDirectories(adapter, kind)
             from(new File(adapter, "src/main/${kind}")) {
-                exclude { FileTreeElement entry -> new File(overlay, entry.path).isFile() }
+                exclude { FileTreeElement entry -> overlayOrigin(overlays, entry.path) >= 0 }
+            }
+            overlays.eachWithIndex { File overlay, int index ->
+                from(overlay) {
+                    exclude { FileTreeElement entry -> !entry.directory && overlayOrigin(overlays, entry.path) != index }
+                }
             }
-            from(overlay)
         }
         includeEmptyDirs = false
         into(layout.buildDirectory.dir("generated/sources/iris/${kind}"))
@@ -41,37 +54,49 @@ tasks.withType(Test).configureEach {
     tasks.named('verifyNativeBoundary').configure { dependsOn(prepareSources) }
 }
 
-File testRulesFile = file("../modded-common/src/versions/${sourceMinecraftVersion}/test/source-replacements.json")
-if (testRulesFile.isFile()) {
-    Map<String, Object> testRules = (Map<String, Object>) new JsonSlurper().parse(testRulesFile)
+List<File> testRulesFiles = sourceOverlays.collect { String overlay ->
+    file("../modded-common/src/versions/${overlay}/test/source-replacements.json")
+}
+boolean testOverlays = testRulesFiles.any { File rules -> rules.isFile() } || adapterSourceRoots.any { File adapter ->
+    overlayDirectories(adapter, 'test/java').any { File directory -> directory.isDirectory() }
+}
+if (testOverlays) {
+    List<Map<String, Object>> testRules = testRulesFiles.collect { File rules ->
+        rules.isFile() ? (Map<String, Object>) new JsonSlurper().parse(rules) : [:]
+    }
     TaskProvider<Sync> prepareTests = tasks.register('prepareVersionTests', Sync) {
-        inputs.file(testRulesFile)
+        testRulesFiles.findAll { File rules -> rules.isFile() }.each { File rules -> inputs.file(rules) }
         adapterSourceRoots.each { File adapter ->
-            File overlay = new File(adapter, "src/versions/${sourceMinecraftVersion}/test/java")
+            List<File> overlays = overlayDirectories(adapter, 'test/java')
             from(new File(adapter, 'src/test/java')) {
-                exclude { FileTreeElement entry -> new File(overlay, entry.path).isFile() }
+                exclude { FileTreeElement entry -> overlayOrigin(overlays, entry.path) >= 0 }
+            }
+            overlays.eachWithIndex { File overlay, int index ->
+                from(overlay) {
+                    exclude { FileTreeElement entry -> !entry.directory && overlayOrigin(overlays, entry.path) != index }
+                }
             }
-            from(overlay)
         }
         includeEmptyDirs = false
         into(layout.buildDirectory.dir('generated/sources/iris/test'))
         doLast {
-            List<Map<String, String>> rules = (List<Map<String, String>>) (testRules.get('global') ?: [])
-            Map<String, List<Map<String, String>>> fileRules = (Map<String, List<Map<String, String>>>) (testRules.get('files') ?: [:])
             project.fileTree(destinationDir).matching { include('**/*.java') }.each { File source ->
                 String path = destinationDir.toPath().relativize(source.toPath()).toString().replace(File.separator, '/')
-                boolean overridden = adapterSourceRoots.any { File adapter ->
-                    new File(adapter, "src/versions/${sourceMinecraftVersion}/test/java/${path}").isFile()
-                }
-                if (!overridden) {
-                    String content = source.getText('UTF-8')
-                    String rewritten = content
+                int origin = adapterSourceRoots.collect { File adapter ->
+                    overlayOrigin(overlayDirectories(adapter, 'test/java'), path)
+                }.max()
+                String content = source.getText('UTF-8')
+                String rewritten = content
+                for (int index = origin + 1; index < testRules.size(); index++) {
+                    Map<String, Object> replacements = testRules.get(index)
+                    List<Map<String, String>> rules = (List<Map<String, String>>) (replacements.get('global') ?: [])
+                    Map<String, List<Map<String, String>>> fileRules = (Map<String, List<Map<String, String>>>) (replacements.get('files') ?: [:])
                     for (Map<String, String> rule : rules + (fileRules.get(path) ?: [])) {
                         rewritten = rewritten.replaceAll(rule.pattern, rule.replacement)
                     }
-                    if (content != rewritten) {
-                        source.setText(rewritten, 'UTF-8')
-                    }
+                }
+                if (content != rewritten) {
+                    source.setText(rewritten, 'UTF-8')
                 }
             }
         }
diff --git a/gradle/native-minecraft-sources.gradle b/gradle/native-minecraft-sources.gradle
index ef0818a30..836bc3647 100644
--- a/gradle/native-minecraft-sources.gradle
+++ b/gradle/native-minecraft-sources.gradle
@@ -1,4 +1,5 @@
 import groovy.json.JsonSlurper
+import java.util.zip.ZipEntry
 import java.util.zip.ZipFile
 
 Configuration nativeMinecraftSources = configurations.create('nativeMinecraftSources') {
@@ -8,31 +9,42 @@ Configuration nativeMinecraftSources = configurations.create('nativeMinecraftSou
 
 String nativeSourceLoader = extensions.extraProperties.get('nativeSourceLoader')
 String nativeSourceImplementation = 'minecraft26_2'
-String nativeSourceMinecraftVersion = providers.gradleProperty('minecraftVersion').getOrElse('26.3')
-String versionPrefix = "versions/${nativeSourceMinecraftVersion}/"
+List<String> nativeSourceOverlays = (List<String>) irisModTarget.overlays
+List<String> versionPrefixes = nativeSourceOverlays.collect { String overlay -> "versions/${overlay}/".toString() }
 extensions.extraProperties.set('nativeSourceImplementation', nativeSourceImplementation)
 dependencies.add(nativeMinecraftSources.name,
     "com.github.VolmitSoftware.VolmLib:native-${nativeSourceImplementation}-sources:master-SNAPSHOT")
 
-Set<String> overrides = new HashSet<>()
-Map<String, Object> replacements = [:]
+List<Set<String>> overlayEntries = versionPrefixes.collect { String ignored -> new HashSet<String>() }
+List<Map<String, Object>> overlayReplacements = versionPrefixes.collect { String ignored -> new HashMap<String, Object>() }
+Closure<Integer> overlayOrigin = { String path ->
+    for (int index = overlayEntries.size() - 1; index >= 0; index--) {
+        if (overlayEntries.get(index).contains(path)) {
+            return index
+        }
+    }
+    return -1
+}
 TaskProvider<Sync> unpackNativeMinecraftSources = tasks.register('unpackNativeMinecraftSources', Sync) {
     dependsOn(nativeMinecraftSources)
-    inputs.property('minecraftVersion', nativeSourceMinecraftVersion)
+    inputs.property('overlays', nativeSourceOverlays)
     inputs.property('loader', nativeSourceLoader)
     doFirst {
-        overrides.clear()
+        overlayEntries.each { Set<String> entries -> entries.clear() }
+        overlayReplacements.each { Map<String, Object> rules -> rules.clear() }
         for (File artifact : nativeMinecraftSources) {
             new ZipFile(artifact).withCloseable { ZipFile archive ->
-                archive.entries().each { entry ->
-                    if (entry.name.startsWith(versionPrefix)) {
-                        overrides.add(entry.name.substring(versionPrefix.length()))
+                versionPrefixes.eachWithIndex { String versionPrefix, int index ->
+                    archive.entries().each { ZipEntry entry ->
+                        if (entry.name.startsWith(versionPrefix)) {
+                            overlayEntries.get(index).add(entry.name.substring(versionPrefix.length()))
+                        }
                     }
-                }
-                java.util.zip.ZipEntry rules = archive.getEntry(versionPrefix + 'source-replacements.json')
-                if (rules != null) {
-                    archive.getInputStream(rules).withCloseable { InputStream stream ->
-                        replacements = (Map<String, Object>) new JsonSlurper().parse(stream)
+                    ZipEntry rules = archive.getEntry(versionPrefix + 'source-replacements.json')
+                    if (rules != null) {
+                        archive.getInputStream(rules).withCloseable { InputStream stream ->
+                            overlayReplacements.get(index).putAll((Map<String, Object>) new JsonSlurper().parse(stream))
+                        }
                     }
                 }
             }
@@ -42,32 +54,40 @@ TaskProvider<Sync> unpackNativeMinecraftSources = tasks.register('unpackNativeMi
         include('art/**', 'modded/**', "${nativeSourceLoader}/**",
             'resources/modded/**', "resources/${nativeSourceLoader}/**")
         eachFile { FileCopyDetails source ->
-            if (overrides.contains(source.path)) {
+            if (overlayOrigin(source.path) >= 0) {
                 source.exclude()
             }
         }
     }
-    from(provider { nativeMinecraftSources.collect { File artifact -> zipTree(artifact) } }) {
-        include("${versionPrefix}art/**", "${versionPrefix}modded/**", "${versionPrefix}${nativeSourceLoader}/**",
-            "${versionPrefix}resources/modded/**", "${versionPrefix}resources/${nativeSourceLoader}/**")
-        eachFile { FileCopyDetails source -> source.path = source.path.substring(versionPrefix.length()) }
+    versionPrefixes.eachWithIndex { String versionPrefix, int index ->
+        from(provider { nativeMinecraftSources.collect { File artifact -> zipTree(artifact) } }) {
+            include("${versionPrefix}art/**", "${versionPrefix}modded/**", "${versionPrefix}${nativeSourceLoader}/**",
+                "${versionPrefix}resources/modded/**", "${versionPrefix}resources/${nativeSourceLoader}/**")
+            eachFile { FileCopyDetails source ->
+                source.path = source.path.substring(versionPrefix.length())
+                if (overlayOrigin(source.path) != index) {
+                    source.exclude()
+                }
+            }
+        }
     }
     includeEmptyDirs = false
     into(layout.buildDirectory.dir('generated/sources/native-minecraft'))
     doLast {
-        List<Map<String, String>> rules = (List<Map<String, String>>) (replacements.get('global') ?: [])
-        Map<String, List<Map<String, String>>> fileRules = (Map<String, List<Map<String, String>>>) (replacements.get('files') ?: [:])
         project.fileTree(destinationDir).matching { include('**/*.java') }.each { File source ->
             String path = destinationDir.toPath().relativize(source.toPath()).toString().replace(File.separator, '/')
-            if (!overrides.contains(path)) {
-                String content = source.getText('UTF-8')
-                String rewritten = content
+            String content = source.getText('UTF-8')
+            String rewritten = content
+            for (int index = overlayOrigin(path) + 1; index < overlayReplacements.size(); index++) {
+                Map<String, Object> replacements = overlayReplacements.get(index)
+                List<Map<String, String>> rules = (List<Map<String, String>>) (replacements.get('global') ?: [])
+                Map<String, List<Map<String, String>>> fileRules = (Map<String, List<Map<String, String>>>) (replacements.get('files') ?: [:])
                 for (Map<String, String> rule : rules + (fileRules.get(path) ?: [])) {
                     rewritten = rewritten.replaceAll(rule.pattern, rule.replacement)
                 }
-                if (content != rewritten) {
-                    source.setText(rewritten, 'UTF-8')
-                }
+            }
+            if (content != rewritten) {
+                source.setText(rewritten, 'UTF-8')
             }
         }
     }