The Greiflands

The mod recreates the feel of finding an area in a server world that has been griefed in anarchy play. Lavacasts are large cobblestone monuments topped with lava and water that flow out over the surrounding land, which ends up mostly covered in lava. Most vanilla structures generate inside the biome and usually survive, and hostile mobs are the only creatures that spawn there. The biome is most often found near oceans and jungles.

On Forge for 1.20.1 the mod adds a single new biome, while the NeoForge build for 1.21.1 and later can also spawn lavacasts in ordinary overworld biomes. The frequency of lavacast generation is set in the config, offered at common, rare and extremely rare levels. The author recommends choosing a frequency that feels right. The mod works with most biome mods and was tested with Biomes O Plenty and Terralith. It is server-side only, so players join without installing it. The code is not open source; it is released under CC0 1.0 Universal.