🌋lavaSourceConversion/onlyInNetherBiomes

Lava sources being created in the Nether (left) vs not outside of it (right)

Granular Gamerules lets you filter lava source generation by biome, when the vanilla gamerule lavaSourceConversion is true.

Command: /gamerule lavaSourceConversion/onlyInNetherBiomes

You can specifiy your own biomes in the #granulargamerules:lava_convertible biome tag.

By default, this is everything in the #minecraft:is_nether and Fabric API #c:is_nether tags.

💧waterSourceConversion/onlyInWetBiomes