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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6354votes
(Dimension) Sky lands under review
7967votes
Oasis under review
3685votes
Biome: Magic Forest under review
2533votes
Add natural events to the Nether. under review
1550votes
Dream Biome! under review
4202votes
Sandstorms under review
1600votes
2578votes
Giants Biome under review
3019votes
(Swamp) Fog under review