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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Biomes and Dimensions

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3votes
Deep and cold oceans should give you the frost effect
3votes
the alternative valley [new end biome]
3votes
New dimensions
7votes
How I think the deep dark should be
4votes
New End Void
0votes
Mangrove root thickness
3votes
Deep Dark Ancient City Portal Concept
4votes
Music in Deep Dark
1vote
End Warps, End leaks and Void Growth
1vote
Why the deep dark is good but also terrible
3votes
Bigger Realistic Fern with Pine trees
2votes
wool armor whith seasons
3votes
Expansion of Deep Oceans and Flooded Caves
5votes
New Fir Forest Mountains
5votes
Dynamic Forests
4votes
Vertically-oriented slime-themed Dimension
0votes
Beach and inner beach on the border between an ocean and land
2votes
Dried Stream Beds and Aquifers.
9votes
Ancient Riverbed
3votes
Mushroom Groves Sub Biome
2votes
The Lower Dimension
4votes
Haunted Grove
6votes
Snow Mushrooms
11votes
Dragon Graveyard. A new End Biome
4votes
Stone Desert
18votes
mushrooms can grow on the side of blocks like logs and dirt
5votes
New Nether Biome: Irradiated Barrens
3votes
Red Mountain edges
4votes
The Hearts of South America: Yellowheart, Greenheart, and Purpleheart
6votes
The paradise/Aether dimansian