diff --git a/gradle.properties b/gradle.properties
index 092beb34..172c19fa 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -8,7 +8,7 @@ yarn_mappings=6
 loader_version=0.11.3
 
 # Mod Properties
-mod_version = 0.1.17
+mod_version = 0.1.18
 maven_group = ru.bclib
 archives_base_name = bclib
 
diff --git a/src/main/java/ru/bclib/util/WeighTree.java b/src/main/java/ru/bclib/util/WeighTree.java
index 28527dca..096747c4 100644
--- a/src/main/java/ru/bclib/util/WeighTree.java
+++ b/src/main/java/ru/bclib/util/WeighTree.java
@@ -1,5 +1,6 @@
 package ru.bclib.util;
 
+import java.util.Locale;
 import java.util.Random;
 
 public class WeighTree<T> {
@@ -20,20 +21,20 @@ public class WeighTree<T> {
 		return root.get(random.nextFloat() * maxWeight);
 	}
 	
-	private Node getNode(WeightedList<T> biomes) {
-		int size = biomes.size();
+	private Node getNode(WeightedList<T> list) {
+		int size = list.size();
 		if (size == 1) {
-			return new Leaf(biomes.get(0));
+			return new Leaf(list.get(0));
 		}
 		else if (size == 2) {
-			T first = biomes.get(0);
-			return new Branch(biomes.getWeight(0), new Leaf(first), new Leaf(biomes.get(1)));
+			T first = list.get(0);
+			return new Branch(list.getWeight(0), new Leaf(first), new Leaf(list.get(1)));
 		}
 		else {
 			int index = size >> 1;
-			float separator = biomes.getWeight(index);
-			Node a = getNode(biomes.subList(0, index + 1));
-			Node b = getNode(biomes.subList(index, size));
+			float separator = list.getWeight(index);
+			Node a = getNode(list.subList(0, index + 1));
+			Node b = getNode(list.subList(index, size));
 			return new Branch(separator, a, b);
 		}
 	}
@@ -57,18 +58,33 @@ public class WeighTree<T> {
 		T get(float value) {
 			return value < separator ? min.get(value) : max.get(value);
 		}
+		
+		@Override
+		public String toString() {
+			return String.format(Locale.ROOT, "[%f, %s, %s]", separator, min.toString(), max.toString());
+		}
 	}
 	
 	private class Leaf extends Node {
 		final T biome;
 		
-		Leaf(T biome) {
-			this.biome = biome;
+		Leaf(T value) {
+			this.biome = value;
 		}
 
 		@Override
 		T get(float value) {
 			return biome;
 		}
+		
+		@Override
+		public String toString() {
+			return String.format(Locale.ROOT, "[%s]", biome.toString());
+		}
+	}
+	
+	@Override
+	public String toString() {
+		return root.toString();
 	}
 }
diff --git a/src/main/java/ru/bclib/world/biomes/BCLBiome.java b/src/main/java/ru/bclib/world/biomes/BCLBiome.java
index 6706f94d..f4c589a0 100644
--- a/src/main/java/ru/bclib/world/biomes/BCLBiome.java
+++ b/src/main/java/ru/bclib/world/biomes/BCLBiome.java
@@ -2,9 +2,11 @@ package ru.bclib.world.biomes;
 
 import java.io.InputStream;
 import java.util.List;
+import java.util.Map;
 import java.util.Random;
 
 import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
 import com.google.gson.JsonArray;
 import com.google.gson.JsonObject;
 
@@ -31,6 +33,7 @@ public class BCLBiome {
 	protected float maxSubBiomeChance = 1;
 	protected final float genChance;
 
+	private final Map<String, Object> customData;
 	private final float fogDensity;
 	private BCLFeature structuresFeature;
 	private Biome actualBiome;
@@ -44,6 +47,7 @@ public class BCLBiome {
 		this.biome = definition.build();
 		this.genChance = definition.getGenChance();
 		this.fogDensity = definition.getFodDensity();
+		this.customData = definition.getCustomData();
 	}
 
 	public BCLBiome(ResourceLocation id, Biome biome, float fogDensity, float genChance) {
@@ -52,6 +56,7 @@ public class BCLBiome {
 		this.genChance = genChance;
 		this.fogDensity = fogDensity;
 		this.readStructureList();
+		this.customData = Maps.newHashMap();
 	}
 
 	public BCLBiome getEdge() {
@@ -179,4 +184,9 @@ public class BCLBiome {
 	public int hashCode() {
 		return mcID.hashCode();
 	}
+	
+	@SuppressWarnings("unchecked")
+	public <T> T getCustomData(String name) {
+		return (T) customData.get(name);
+	}
 }
diff --git a/src/main/java/ru/bclib/world/biomes/BCLBiomeDef.java b/src/main/java/ru/bclib/world/biomes/BCLBiomeDef.java
index 479ee4b1..7a96e694 100644
--- a/src/main/java/ru/bclib/world/biomes/BCLBiomeDef.java
+++ b/src/main/java/ru/bclib/world/biomes/BCLBiomeDef.java
@@ -1,8 +1,10 @@
 package ru.bclib.world.biomes;
 
 import java.util.List;
+import java.util.Map;
 
 import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
 
 import net.minecraft.core.Registry;
 import net.minecraft.core.particles.ParticleOptions;
@@ -50,6 +52,7 @@ public class BCLBiomeDef {
 	private final List<CarverInfo> carvers = Lists.newArrayList();
 	private final List<SpawnInfo> mobs = Lists.newArrayList();
 	private final List<SpawnerData> spawns = Lists.newArrayList();
+	private final Map<String, Object> customData = Maps.newHashMap();
 	
 	private final ResourceLocation id;
 
@@ -369,4 +372,12 @@ public class BCLBiomeDef {
 		carvers.add(info);
 		return this;
 	}
+	
+	public void addCustomData(String name, Object value) {
+		customData.put(name, value);
+	}
+	
+	protected Map<String, Object> getCustomData() {
+		return customData;
+	}
 }
\ No newline at end of file