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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4votes
The far lands
4votes
Pokimon
4votes
Nether Sky
4votes
New Dimension with a Boss and new traders and armor/tool
4votes
Crying Forests
4votes
Great ocean
4votes
Farland Garden: A new end biome
4votes
Araucaria's Biome
4votes
Pine Caves
4votes
Endless underworld dimension concept
4votes
Dead woods biome
4votes
Nether and End
4votes
Add a new dimension called "The Piglin Islands"
4votes
New Dimension: Badmist
4votes
Storm Biome
4votes
(Nether Biome) Coal hills
4votes
The Outlands of the End
4votes
Sahara
4votes
Mourning Fields (Nether Biome)
4votes
Crimson jungle
4votes
Monster Biome
4votes
The Cat dimension and the dog dimension
4votes
Slipped Forest
4votes
Добавление ада и ендер мира
4votes
Sever connections between Nether and End
4votes
Add seed generators for different dimensions
4votes
Inverted colour biome
4votes
(Biome) ender of eye
4votes
Stone Jungle (biome)
4votes
new dimension: Ice & fire