I am currently making my server: NebulaPvP (Factions) and I want to make it unique. I want to add custom biomes on the server. One example is the ore biomes. The ore biomes are biomes that have massive vains of the ore. For example: The diamond biome would be the rarest biome and if you find it, there will be tons of diamond ore underground. I don't know how to do this so I was thinking maybe one of you guys/girls can help me.