Not a big idiom, Cave Biome Api - which can be made Backport, good as lush caves down to - 30 blocks or - 60 blocks, it was possible to add normal slate ....Do you have a discord?

Biome Api - name ??? Fluidlogged-API+Biome API(Cave Biome Api) + Nether-API This was a powerful thing for mods..

Cave Biome Api

Someone else suggested a cave biome api, but instead as new functionality for Nether API (jbredwards/Nether-API#6). I like your approach much more of having it as a separate mod (so they can be maintained independently). I'll have to think about whether it's something that's actually practical on 1.12 though. If I were to make a cave biome library mod, it would probably be after I get caught up on the rest of my other mods first :)

Do you have a discord?

I'm not using discord at the moment, but you can send direct messages via CurseForge!

Fluidlogged-API+Biome API(Cave Biome Api) + Nether-API This was a powerful thing for mods..

This is very kind! <3

Nether API and Fluidlogged-API will be useful. One for the Nether, another for water, the last one is the Earth API. Three elements of Minecraft 112)) Yes, new patches update Minecraft.. But mods are updated less and less often, Minecraft.. + Three engines Forge, Neoforge, Fabric, which is not very convenient.. Think about this proposal, maybe - when there is time, you will do something similar.