Please read the pinned post on creating biomes and dimensions. Remember portals are structures.

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540votes
Ready to talk biomes and dimensions? Here's how to do it! (Start Here) Pinned
2votes
The void update
2votes
Cave biome
4votes
MORE BIOMES
5votes
Dragon and the Magical update
3votes
more nether/end stuff
2votes
veryated end
3votes
Cave biomes Crystal / fossil etc
6votes
better nether
3votes
Better trees
1vote
metor biome
3votes
exaggerated biomes
5votes
Food dimension
2votes
Nether oasis
7votes
Deadlands Biome
4votes
Stone Forest
3votes
Zenith Dimension
0votes
Cold Ocean
2votes
new Cave biome: Underworld Utopia
0votes
watshee dimension
2votes
Thunder dimension
8votes
Glowing forest biome
9votes
Lake Biome
1vote
Lavender biome
4votes
Decrease jungle rarity
1vote
The Crimson Dimension
6votes
Shadewood trees and "Lost" biome
3votes
Mini-Nether
2votes
Big Oak Forest
0votes
Dead Volcano biomes