Please read the pinned post on creating biomes and dimensions. Please put items for the new Mountains and Nether Updates in their proper categories. Remember portals are structures, that includes Nether portals.

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22votes
Underworld Dimension? needs info
1vote
Unnamed Dimension (with Blazes) needs info
3votes
Dimensions based on a single type of monster (was: Nuevas dimensiones) needs info
3votes
Corruption/ badlands/ dark lands needs info
21votes
Wastland biome needs info
64votes
Large biomes /Amplified Worlds needs info
22votes
Update Magma needs info