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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6404votes
(Dimension) Sky lands under review
8043votes
Oasis under review
3722votes
Biome: Magic Forest under review
2563votes
Add natural events to the Nether. under review
1575votes
Dream Biome! under review
4242votes
Sandstorms under review
1612votes
2605votes
Giants Biome under review
3045votes
(Swamp) Fog under review