| Class | Description | 
|---|---|
| WorldTypeEvent | WorldTypeEvent is fired when an event involving the world occurs. If a method utilizes this Eventas its parameter, the method will
 receive every child event of this class.WorldTypeEvent.worldTypecontains the WorldType of the world this event is occurring in.All children of this event are fired on the MinecraftForge#TERRAIN_GEN_BUS. | 
| WorldTypeEvent.BiomeSize | BiomeSize is fired when vanilla Minecraft attempts to generate biomes. This event is fired during biome generation in GenLayer#initializeAllBiomeGenerators(long, WorldType, ChunkProviderSettings). |