diff --git a/src/main/java/net/minecraft/server/BiomeCache.java b/src/main/java/net/minecraft/server/BiomeCache.java
new file mode 100644
index 000000000..e33c645b2
--- /dev/null
+++ b/src/main/java/net/minecraft/server/BiomeCache.java
@@ -0,0 +1,52 @@
+package net.minecraft.server;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import java.util.concurrent.TimeUnit;
+
+public class BiomeCache {
+
+    private final WorldChunkManager a;
+    private final LoadingCache<ChunkCoordIntPair, BiomeCache.a> b;
+
+    public BiomeCache(WorldChunkManager worldchunkmanager) {
+        this.b = CacheBuilder.newBuilder().expireAfterAccess(30000L, TimeUnit.MILLISECONDS).build(new CacheLoader<ChunkCoordIntPair, BiomeCache.a>() {
+            public BiomeCache.a load(ChunkCoordIntPair chunkcoordintpair) throws Exception {
+                return BiomeCache.this.new a(chunkcoordintpair.x, chunkcoordintpair.z);
+            }
+        });
+        this.a = worldchunkmanager;
+    }
+
+    public BiomeCache.a a(int i, int j) {
+        i >>= 4;
+        j >>= 4;
+        return (BiomeCache.a) this.b.getUnchecked(new ChunkCoordIntPair(i, j));
+    }
+
+    public BiomeBase a(int i, int j, BiomeBase biomebase) {
+        BiomeBase biomebase1 = this.a(i, j).a(i, j);
+
+        return biomebase1 == null ? biomebase : biomebase1;
+    }
+
+    public void a() {}
+
+    public BiomeBase[] b(int i, int j) {
+        return this.a(i, j).b;
+    }
+
+    public class a {
+
+        private final BiomeBase[] b;
+
+        public a(int i, int j) {
+            this.b = BiomeCache.this.a.a(i << 4, j << 4, 16, 16, false);
+        }
+
+        public BiomeBase a(int i, int j) {
+            return this.b[i & 15 | (j & 15) << 4];
+        }
+    }
+}
diff --git a/src/main/java/net/minecraft/server/WorldGenDecoratorSpike.java b/src/main/java/net/minecraft/server/WorldGenDecoratorSpike.java
new file mode 100644
index 000000000..27f70cd52
--- /dev/null
+++ b/src/main/java/net/minecraft/server/WorldGenDecoratorSpike.java
@@ -0,0 +1,70 @@
+package net.minecraft.server;
+
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.common.collect.ContiguousSet;
+import com.google.common.collect.DiscreteDomain;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Range;
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.TimeUnit;
+
+public class WorldGenDecoratorSpike extends WorldGenDecorator<WorldGenFeatureDecoratorEmptyConfiguration> {
+
+    private static final LoadingCache<Long, WorldGenEnder.Spike[]> a = CacheBuilder.newBuilder().expireAfterWrite(5L, TimeUnit.MINUTES).build(new WorldGenDecoratorSpike.a());
+
+    public WorldGenDecoratorSpike() {}
+
+    public <C extends WorldGenFeatureConfiguration> boolean a(GeneratorAccess generatoraccess, ChunkGenerator<? extends GeneratorSettings> chunkgenerator, Random random, BlockPosition blockposition, WorldGenFeatureDecoratorEmptyConfiguration worldgenfeaturedecoratoremptyconfiguration, WorldGenerator<C> worldgenerator, C c0) {
+        WorldGenEnder.Spike[] aworldgenender_spike = a(generatoraccess);
+        boolean flag = false;
+        WorldGenEnder.Spike[] aworldgenender_spike1 = aworldgenender_spike;
+        int i = aworldgenender_spike.length;
+
+        for (int j = 0; j < i; ++j) {
+            WorldGenEnder.Spike worldgenender_spike = aworldgenender_spike1[j];
+
+            if (worldgenender_spike.a(blockposition)) {
+                ((WorldGenEnder) worldgenerator).a(worldgenender_spike);
+                flag |= ((WorldGenEnder) worldgenerator).a(generatoraccess, chunkgenerator, random, new BlockPosition(worldgenender_spike.a(), 45, worldgenender_spike.b()), WorldGenFeatureConfiguration.e);
+            }
+        }
+
+        return flag;
+    }
+
+    public static WorldGenEnder.Spike[] a(GeneratorAccess generatoraccess) {
+        Random random = new Random(generatoraccess.getSeed());
+        long i = random.nextLong() & 65535L;
+
+        return (WorldGenEnder.Spike[]) WorldGenDecoratorSpike.a.getUnchecked(i);
+    }
+
+    static class a extends CacheLoader<Long, WorldGenEnder.Spike[]> {
+
+        private a() {}
+
+        public WorldGenEnder.Spike[] load(Long olong) throws Exception {
+            List<Integer> list = Lists.newArrayList(ContiguousSet.create(Range.closedOpen(0, 10), DiscreteDomain.integers()));
+
+            Collections.shuffle(list, new Random(olong));
+            WorldGenEnder.Spike[] aworldgenender_spike = new WorldGenEnder.Spike[10];
+
+            for (int i = 0; i < 10; ++i) {
+                int j = (int) (42.0D * Math.cos(2.0D * (-3.141592653589793D + 0.3141592653589793D * (double) i)));
+                int k = (int) (42.0D * Math.sin(2.0D * (-3.141592653589793D + 0.3141592653589793D * (double) i)));
+                int l = (Integer) list.get(i);
+                int i1 = 2 + l / 3;
+                int j1 = 76 + l * 3;
+                boolean flag = l == 1 || l == 2;
+
+                aworldgenender_spike[i] = new WorldGenEnder.Spike(j, k, i1, j1, flag);
+            }
+
+            return aworldgenender_spike;
+        }
+    }
+}