Please read the pinned post on creating new biomes and dimensions. Remember that individual items, mobs, and structures should still go in their own categories - this is not a category for entire updates.

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Slimeblock land
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Ice Labyrinth
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Temporary dimensions
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Vale of Shadows (Dimension)
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Nether Lava Base
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Pusher boar (or) Boar of the underworld
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Soul ravines in the nether
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Jagged stone bay
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Dimension X
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Thunder dimension
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Tormentas de arena
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Mushroom Coral Reef
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Mejorar las playas
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Cubed Dimensions!
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Dragon stone (part three)
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Realm of oblivion
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Tight oak tree biome
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Twisted Dimension
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Asphalt Lakes - (Mini-biome)
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A moorland/heath biome
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(Biome) Walnut Forests
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Branch dimension nether
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The Fallen realm
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Thick forest biome
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Tryx dimension
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'Deep Underground' Zone (Part Two of Two)
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Adventure dimension
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The Underground Dimension
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Sapling Growth Speed Variation
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Tall Oak Trees and Tall Oak Tree Biome