I am attempting to create a few different types of world maps and I've gotten stuck on one. I am now trying to create a nether void. That is, a all hell biome map-wide with nothing but air chunks. I have attempted cleanroomgenerator and VoidGenerator-1.1.0. Both are capable of creating void worlds just as Multiworld has an empty world gen built in. However, I have been unable to specify the biome for the new map. I either get plains, the usual random assortment of biomes normal maps make, or a biome called "The Void". The map will need to be rather large and might expand later so I need it to be able to generate new empty nether chunks as maps normally do, thus certain solutions I've found posted in other forums will not work such as: Making a normal nether and clearing it with worldedit. Making a normal nether and clearing it with mcedit. Making a void world and changing the biome with worldedit.