diff --git a/src/main/resources/default-config/biomes/forest/dark_forest.yml b/src/main/resources/default-config/biomes/forest/dark_forest.yml
index eaf40f8a3..24fac3578 100644
--- a/src/main/resources/default-config/biomes/forest/dark_forest.yml
+++ b/src/main/resources/default-config/biomes/forest/dark_forest.yml
@@ -39,6 +39,11 @@ trees:
   density: 400
   items:
     DARK_OAK:
+      weight: 19
+      y:
+        min: 58
+        max: 84
+    RED_MUSHROOM:
       weight: 1
       y:
         min: 58
diff --git a/src/main/resources/default-config/biomes/mushroom_island.yml b/src/main/resources/default-config/biomes/mushroom_island.yml
new file mode 100644
index 000000000..53e81dffe
--- /dev/null
+++ b/src/main/resources/default-config/biomes/mushroom_island.yml
@@ -0,0 +1,49 @@
+noise-equation: "((-((y / 63)^2)) + 1) + ((noise2(x, z)+0.5) / 2)"
+extends: "BASIC_ORES"
+id: "MUSHROOM_ISLANDS"
+
+palette:
+  - "BLOCK:minecraft:bedrock": 0
+  - BEDROCK_MOST: 1
+  - BEDROCK_HALF: 2
+  - BEDROCK_LITTLE: 3
+  - RIVER_BOTTOM: 61
+  - RIVER_SHORE: 62
+  - MYCELIUM: 255
+vanilla: MUSHROOM_FIELDS
+
+flora:
+  chance: 15
+  attempts: 1
+  items:
+    RED_MUSHROOM:
+      weight: 100
+      y:
+        min: 62
+        max: 84
+    BROWN_MUSHROOM:
+      weight: 100
+      y:
+        min: 62
+        max: 84
+    SMALL_ROCK:
+      weight: 10
+      y:
+        min: 62
+        max: 84
+
+erodible: true
+
+trees:
+  density: 250
+  items:
+    BROWN_MUSHROOM:
+      weight: 8
+      y:
+        min: 58
+        max: 84
+    RED_MUSHROOM:
+      weight: 2
+      y:
+        min: 58
+        max: 84
diff --git a/src/main/resources/default-config/carving/cave.yml b/src/main/resources/default-config/carving/cave.yml
index f8b5166e9..6af35f30c 100644
--- a/src/main/resources/default-config/carving/cave.yml
+++ b/src/main/resources/default-config/carving/cave.yml
@@ -59,6 +59,7 @@ palette:
         y: 255
 shift:
   "minecraft:grass_block": [ "minecraft:dirt" ]
+  "minecraft:mycelium": [ "minecraft:dirt" ]
   "minecraft:podzol": [ "minecraft:dirt" ]
   "minecraft:gravel": [ "minecraft:dirt" ]
   "minecraft:sand": [ "minecraft:dirt" ]
diff --git a/src/main/resources/default-config/flora/button.yml b/src/main/resources/default-config/flora/button.yml
index a1746a0db..c1e37a8ae 100644
--- a/src/main/resources/default-config/flora/button.yml
+++ b/src/main/resources/default-config/flora/button.yml
@@ -11,5 +11,6 @@ spawnable:
   - "minecraft:gravel"
   - "minecraft:dirt"
   - "minecraft:coarse_dirt"
+  - "minecraft:mycelium"
 replaceable:
   - "minecraft:air"
\ No newline at end of file
diff --git a/src/main/resources/default-config/grids/ocean_deep.yml b/src/main/resources/default-config/grids/ocean_deep.yml
index 9c06d6afc..8f7aa223e 100644
--- a/src/main/resources/default-config/grids/ocean_deep.yml
+++ b/src/main/resources/default-config/grids/ocean_deep.yml
@@ -1,13 +1,13 @@
 grid:
   - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
   - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
-  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
-  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
-  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
-  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
-  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
-  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
-  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
+  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_SHELF", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
+  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_SHELF", "OCEAN", "OCEAN_SHELF", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
+  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_SHELF", "OCEAN", "MUSHROOM_ISLANDS", "OCEAN", "LUKEWARM_OCEAN_SHELF", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
+  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_SHELF", "OCEAN", "MUSHROOM_ISLANDS", "MUSHROOM_ISLANDS", "MUSHROOM_ISLANDS", "OCEAN", "WARM_OCEAN_SHELF", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
+  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_SHELF", "OCEAN", "MUSHROOM_ISLANDS", "OCEAN", "LUKEWARM_OCEAN_SHELF", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
+  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_SHELF", "OCEAN", "OCEAN_SHELF", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
+  - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_SHELF", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
   - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
   - [ "FROZEN_OCEAN_DEEP", "COLD_OCEAN_DEEP", "COLD_OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "LUKEWARM_OCEAN_DEEP", "WARM_OCEAN_DEEP" ]
 id: "OCEAN_DEEP"
\ No newline at end of file
diff --git a/src/main/resources/default-config/palettes/mycelium.yml b/src/main/resources/default-config/palettes/mycelium.yml
new file mode 100644
index 000000000..7ce4ba808
--- /dev/null
+++ b/src/main/resources/default-config/palettes/mycelium.yml
@@ -0,0 +1,11 @@
+layers:
+  - materials:
+      - "minecraft:mycelium": 1
+    layers: 1
+  - materials:
+      - "minecraft:dirt": 1
+    layers: 2
+  - materials:
+      - "minecraft:stone": 1
+    layers: 1
+id: "MYCELIUM"
\ No newline at end of file