The Greiflands

For All Versions at 1.21.1 and above NeoForge
This mod adds lavacasts to your world generation. It should work with most biome mods; it has been tested with Biomes O Plenty and Terralith as these are the two most popular Biome mods.

4 versions of the file for the latest version have released
1 to 8 Everywhere
1 to 80 Common
1 to 160 Rare
1 to 320 Extremely Rare

I recomend selecting the frequency that you feel is right for you.

This controls the frequency of the lavacast generation in the world. Unlike the forge version there is NO Biome Dependancy and it should be able to spawn in any overworld biome that it can.

For 1.20.1 Forge Only
This mod adds one new Biome. The Greiflan. The Greiflan is a biome that adds no new mobs, no new blocks, nothing of value in a traditional sense. The Greiflan is covered in a wonderful thing called a lavacast. What is a lavacast you ask? Have you ever played skyblock? Have you ever seen flowing water and lava touch? Yes you know what I mean now. Large Cobblestone monsters topped off with lava and water that flows out from the biome covering the land in mostly lava (lmao). Most vanilla genrated structures can spawn inside this biome, but most will not survive. Hostile mobs are the only thing that spawns here and the biome is usually found near oceans and jungles.