diff --git a/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/TerrainPopulator.java b/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/TerrainPopulator.java
index 003779d..6622f02 100644
--- a/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/TerrainPopulator.java
+++ b/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/TerrainPopulator.java
@@ -27,12 +27,7 @@ package com.terraforged.core.world.terrain;
 
 import com.terraforged.core.cell.Cell;
 import com.terraforged.core.cell.Populator;
-import com.terraforged.core.util.Seed;
 import me.dags.noise.Module;
-import me.dags.noise.Source;
-
-import java.util.Arrays;
-import java.util.function.BiFunction;
 
 public class TerrainPopulator implements Populator {
 
@@ -62,41 +57,4 @@ public class TerrainPopulator implements Populator {
     public void tag(Cell<Terrain> cell, float x, float y) {
         cell.tag = type;
     }
-
-    public static TerrainPopulator[] combine(TerrainPopulator[] input, Seed seed, int scale) {
-        return combine(input, (tp1, tp2) -> TerrainPopulator.combine(tp1, tp2, seed, scale));
-    }
-
-    public static TerrainPopulator combine(TerrainPopulator tp1, TerrainPopulator tp2, Seed seed, int scale) {
-        Module combined = Source.perlin(seed.next(), scale, 1)
-                .warp(seed.next(), scale / 2, 2, scale / 2)
-                .blend(tp1.getSource(), tp2.getSource(), 0.5, 0.25);
-
-        String name = tp1.getType().getName() + "-" + tp2.getType().getName();
-        int id = Terrain.ID_START + 1 + tp1.getType().getId() * tp2.getType().getId();
-        float weight = Math.min(tp1.getType().getWeight(), tp2.getType().getWeight());
-        Terrain type = new Terrain(name, id, weight);
-
-        return new TerrainPopulator(combined, type);
-    }
-
-    public static <T> T[] combine(T[] input, BiFunction<T, T, T> operator) {
-        int length = input.length;
-        for (int i = 1; i < input.length; i++) {
-            length += (input.length - i);
-        }
-
-        T[] result = Arrays.copyOf(input, length);
-        for (int i = 0, k = input.length; i < input.length; i++) {
-            T t1 = input[i];
-            result[i] = t1;
-            for (int j = i + 1; j < input.length; j++, k++) {
-                T t2 = input[j];
-                T t3 = operator.apply(t1, t2);
-                result[k] = t3;
-            }
-        }
-
-        return result;
-    }
 }
diff --git a/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/provider/StandardTerrainProvider.java b/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/provider/StandardTerrainProvider.java
index 166c90c..089fa03 100644
--- a/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/provider/StandardTerrainProvider.java
+++ b/TerraForgedCore/src/main/java/com/terraforged/core/world/terrain/provider/StandardTerrainProvider.java
@@ -101,7 +101,7 @@ public class StandardTerrainProvider implements TerrainProvider {
 
     @Override
     public List<Populator> getPopulators() {
-        List<TerrainPopulator> mixed = combine(mixable, this::combine);
+        List<TerrainPopulator> mixed = combine(getMixable(mixable), this::combine);
         List<Populator> result = new ArrayList<>(mixed.size() + unmixable.size());
         result.addAll(mixed);
         result.addAll(unmixable);
@@ -117,14 +117,15 @@ public class StandardTerrainProvider implements TerrainProvider {
     }
 
     private static TerrainPopulator combine(TerrainPopulator tp1, TerrainPopulator tp2, Seed seed, int scale) {
-        Module combined = Source.perlin(seed.next(), scale, 1)
-                .warp(seed.next(), scale / 2, 2, scale / 2)
-                .blend(tp1.getSource(), tp2.getSource(), 0.5, 0.25);
+        float weight = Math.min(tp1.getType().getWeight(), tp2.getType().getWeight());
 
         String name = tp1.getType().getName() + "-" + tp2.getType().getName();
         int id = Terrain.ID_START + 1 + tp1.getType().getId() * tp2.getType().getId();
-        float weight = Math.min(tp1.getType().getWeight(), tp2.getType().getWeight());
+
         Terrain type = new Terrain(name, id, weight);
+        Module combined = Source.perlin(seed.next(), scale, 1)
+                .warp(seed.next(), scale / 2, 2, scale / 2D)
+                .blend(tp1.getSource(), tp2.getSource(), 0.5, 0.25);
 
         return new TerrainPopulator(combined, type);
     }
@@ -152,4 +153,14 @@ public class StandardTerrainProvider implements TerrainProvider {
 
         return result;
     }
+
+    private static List<TerrainPopulator> getMixable(List<TerrainPopulator> input) {
+        List<TerrainPopulator> output = new ArrayList<>(input.size());
+        for (TerrainPopulator populator : input) {
+            if (populator.getType().getWeight() > 0) {
+                output.add(populator);
+            }
+        }
+        return output;
+    }
 }
diff --git a/TerraForgedMod/src/main/java/com/terraforged/mod/biome/ModBiomes.java b/TerraForgedMod/src/main/java/com/terraforged/mod/biome/ModBiomes.java
index 70bcc26..ed926ac 100644
--- a/TerraForgedMod/src/main/java/com/terraforged/mod/biome/ModBiomes.java
+++ b/TerraForgedMod/src/main/java/com/terraforged/mod/biome/ModBiomes.java
@@ -27,6 +27,7 @@ package com.terraforged.mod.biome;
 
 import com.terraforged.api.biome.BiomeVariant;
 import net.minecraft.world.biome.Biome;
+import net.minecraftforge.common.BiomeDictionary;
 import net.minecraftforge.event.RegistryEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
@@ -53,7 +54,11 @@ public class ModBiomes {
 
     @SubscribeEvent
     public static void register(RegistryEvent.Register<Biome> event) {
-        biomes.forEach(event.getRegistry()::register);
+        biomes.forEach(biome -> {
+            event.getRegistry().register(biome);
+            BiomeDictionary.makeBestGuess(biome);
+            BiomeDictionary.addTypes(biome, BiomeDictionary.Type.OVERWORLD);
+        });
         biomes.clear();
         biomes.trimToSize();
     }
diff --git a/TerraForgedMod/src/main/java/com/terraforged/mod/biome/provider/BiomeHelper.java b/TerraForgedMod/src/main/java/com/terraforged/mod/biome/provider/BiomeHelper.java
index 75fbe47..f683c4f 100644
--- a/TerraForgedMod/src/main/java/com/terraforged/mod/biome/provider/BiomeHelper.java
+++ b/TerraForgedMod/src/main/java/com/terraforged/mod/biome/provider/BiomeHelper.java
@@ -25,7 +25,6 @@
 
 package com.terraforged.mod.biome.provider;
 
-import com.google.common.collect.Sets;
 import com.terraforged.core.settings.BiomeSettings;
 import com.terraforged.core.world.biome.BiomeData;
 import com.terraforged.core.world.biome.BiomeType;
@@ -55,20 +54,6 @@ import java.util.stream.Collectors;
 
 public class BiomeHelper {
 
-    private static final Set<Biome> IGNORE_BIOMES = Sets.newHashSet(
-            Biomes.THE_END,
-            Biomes.END_BARRENS,
-            Biomes.END_HIGHLANDS,
-            Biomes.END_MIDLANDS,
-            Biomes.SMALL_END_ISLANDS,
-            Biomes.NETHER,
-            Biomes.THE_VOID,
-            Biomes.JUNGLE_EDGE,
-            Biomes.MODIFIED_JUNGLE_EDGE,
-            Biomes.MOUNTAIN_EDGE,
-            Biomes.STONE_SHORE
-    );
-
     private static final Map<BiomeType, BiomePredicate> PREDICATES = new HashMap<BiomeType, BiomePredicate>() {{
         put(BiomeType.TROPICAL_RAINFOREST, BiomePredicate.TROPICAL_RAINFOREST);
         put(BiomeType.SAVANNA, BiomePredicate.SAVANNA.or(BiomePredicate.MESA).not(BiomePredicate.DESERT).not(BiomePredicate.STEPPE).not(BiomePredicate.COAST).not(BiomePredicate.MOUNTAIN).not(BiomePredicate.WETLAND));
@@ -227,7 +212,7 @@ public class BiomeHelper {
         if (biome.getCategory() == Biome.Category.NETHER) {
             return true;
         }
-        return IGNORE_BIOMES.contains(biome);
+        return !BiomeDictionary.getTypes(biome).contains(BiomeDictionary.Type.OVERWORLD);
     }
 
     private static Vec2f getRange(Collection<Biome> biomes, Function<Biome, Float> getter) {
diff --git a/TerraForgedMod/src/main/java/com/terraforged/mod/gui/element/TerraSlider.java b/TerraForgedMod/src/main/java/com/terraforged/mod/gui/element/TerraSlider.java
index 6689422..0f3fd6e 100644
--- a/TerraForgedMod/src/main/java/com/terraforged/mod/gui/element/TerraSlider.java
+++ b/TerraForgedMod/src/main/java/com/terraforged/mod/gui/element/TerraSlider.java
@@ -85,7 +85,7 @@ public abstract class TerraSlider extends Slider implements Slider.ISlider, Elem
 
         public Float(String prefix, CompoundNBT value) {
             super(prefix, value, true);
-            precision = 4;
+            precision = 3;
             setValue(value.getFloat("value"));
             updateSlider();
         }
diff --git a/TerraForgedMod/src/main/java/com/terraforged/mod/gui/preview/PreviewPage.java b/TerraForgedMod/src/main/java/com/terraforged/mod/gui/preview/PreviewPage.java
index b63103d..cb51588 100644
--- a/TerraForgedMod/src/main/java/com/terraforged/mod/gui/preview/PreviewPage.java
+++ b/TerraForgedMod/src/main/java/com/terraforged/mod/gui/preview/PreviewPage.java
@@ -68,7 +68,7 @@ public class PreviewPage extends BasePage {
         preview.setHeight(256);
 
         addElements(right.left, right.top, right, previewerSettings, right.scrollPane::addButton, this::update);
-        right.scrollPane.addButton(new TerraButton("Generate") {
+        right.scrollPane.addButton(new TerraButton("New Seed") {
             @Override
             public void onPress() {
                 preview.regenerate();