diff --git a/Engine b/Engine
index b0a2908..e151e3c 160000
--- a/Engine
+++ b/Engine
@@ -1 +1 @@
-Subproject commit b0a2908a05efa2390580cd147f4313a77bffc270
+Subproject commit e151e3ccf02d305378c269e3086863069fdf4a12
diff --git a/build.gradle b/build.gradle
index c44434d..6d829e9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -34,8 +34,8 @@ repositories {
 
 dependencies {
     minecraft "net.minecraftforge:forge:${mc_version}-${forge_version}"
-    lib (project(":FeatureManager")) { transitive false }
-    lib project(":Engine")
+    lib(project(":FeatureManager")) { transitive false }
+    lib(project(":Engine"))
 }
 
 minecraft {
@@ -97,21 +97,6 @@ task collectLibs(type: Copy) {
     duplicatesStrategy = "EXCLUDE"
 }
 
-task apiJar(type: Jar) {
-    dependsOn("reobfJar")
-
-    // copy contents of the main mod jar but only select packages
-    from { zipTree(tasks.jar.archivePath) }
-    include "com/terraforged/fm/**"
-    include "com/terraforged/api/**"
-    include "com/terraforged/core/**"
-    include "com/terraforged/n2d/**"
-    include "com/terraforged/world/**"
-
-    // self explanatory
-    classifier "api"
-}
-
 processResources {
     filesMatching("**/mods.toml") {
         // replaces the version string in the mods.toml
@@ -133,7 +118,6 @@ publishing {
         // publish the mod jar & api jar
         mavenJava(MavenPublication) {
             artifact jar
-            artifact apiJar
         }
     }
 
diff --git a/src/main/java/com/terraforged/mod/client/gui/page/WorldPage.java b/src/main/java/com/terraforged/mod/client/gui/page/WorldPage.java
index f996101..07de647 100644
--- a/src/main/java/com/terraforged/mod/client/gui/page/WorldPage.java
+++ b/src/main/java/com/terraforged/mod/client/gui/page/WorldPage.java
@@ -95,13 +95,13 @@ public class WorldPage extends BasePage {
 
     private CompoundNBT getDimSettings() {
         CompoundNBT dimSettings = instance.settingsData.getCompound("dimensions");
-
-        CompoundNBT generators = dimSettings.getCompound("dimensions").getCompound("value");
+        CompoundNBT generators = dimSettings.getCompound("dimensions");
         for (String name : generators.keySet()) {
-            CompoundNBT setting = generators.getCompound(name);
-            setting.put("#options", getWorldTypes());
+            if (name.startsWith("#")) {
+                CompoundNBT metadata = generators.getCompound(name);
+                metadata.put("options", getWorldTypes());
+            }
         }
-
         return dimSettings;
     }
 
diff --git a/src/main/java/com/terraforged/mod/client/gui/preview/Preview.java b/src/main/java/com/terraforged/mod/client/gui/preview/Preview.java
index 2af7133..a622ff2 100644
--- a/src/main/java/com/terraforged/mod/client/gui/preview/Preview.java
+++ b/src/main/java/com/terraforged/mod/client/gui/preview/Preview.java
@@ -29,6 +29,7 @@ import com.mojang.blaze3d.platform.GlStateManager;
 import com.mojang.blaze3d.systems.RenderSystem;
 import com.terraforged.core.cell.Cell;
 import com.terraforged.core.concurrent.cache.CacheEntry;
+import com.terraforged.core.concurrent.thread.ThreadPool;
 import com.terraforged.core.concurrent.thread.ThreadPools;
 import com.terraforged.core.settings.Settings;
 import com.terraforged.core.tile.Size;
@@ -62,6 +63,7 @@ public class Preview extends Button {
 
     private final int offsetX;
     private final int offsetZ;
+    private final ThreadPool threadPool = ThreadPools.createDefault();
     private final Random random = new Random(System.currentTimeMillis());
     private final PreviewSettings previewSettings = new PreviewSettings();
     private final DynamicTexture texture = new DynamicTexture(new NativeImage(WIDTH, HEIGHT, true));
@@ -92,6 +94,7 @@ public class Preview extends Button {
 
     public void close() {
         texture.close();
+        threadPool.shutdown();
     }
 
     @Override
@@ -204,7 +207,7 @@ public class Preview extends Button {
         context.factory.getHeightmap().getContinent().getNearestCenter(offsetX, offsetZ, center);
 
         TileGenerator renderer = TileGenerator.builder()
-                .pool(ThreadPools.getPool())
+                .pool(threadPool)
                 .size(FACTOR, 0)
                 .factory(context.factory)
                 .batch(6)
diff --git a/src/main/java/com/terraforged/mod/client/gui/preview2/Preview.java b/src/main/java/com/terraforged/mod/client/gui/preview2/Preview.java
index 22d10d5..c58e64e 100644
--- a/src/main/java/com/terraforged/mod/client/gui/preview2/Preview.java
+++ b/src/main/java/com/terraforged/mod/client/gui/preview2/Preview.java
@@ -19,8 +19,7 @@ public class Preview extends Widget {
 
     private static final float ZOOM_SCALE = 200F;
 
-    private final ThreadPool threadPool = ThreadPools.getPool();
-
+    private final ThreadPool threadPool = ThreadPools.createDefault();
     private final TerraSettings settings;
 
     private int seed;
@@ -49,6 +48,10 @@ public class Preview extends Widget {
         world.update(offsetX, offsetZ, zoom, true);
     }
 
+    public void close() {
+        threadPool.shutdown();
+    }
+
     @Override
     public void render(int mx, int my, float ticks) {
         try {
diff --git a/src/main/java/com/terraforged/mod/client/gui/preview2/PreviewPage.java b/src/main/java/com/terraforged/mod/client/gui/preview2/PreviewPage.java
index 106e756..7bb8fe5 100644
--- a/src/main/java/com/terraforged/mod/client/gui/preview2/PreviewPage.java
+++ b/src/main/java/com/terraforged/mod/client/gui/preview2/PreviewPage.java
@@ -24,6 +24,11 @@ public class PreviewPage extends UpdatablePage {
         return preview.getSeed();
     }
 
+    @Override
+    public void close() {
+        preview.close();
+    }
+
     @Override
     public void apply(Consumer<TerraSettings> consumer) {
         consumer.accept(genSettings);