Modding Discussion • How to do an Underground Magma/Lava Lake or Lava pocket?

For a game I'm writing, I need a reliable deep underground lava lake biome. The underground biomes of minetest_game aren't reliable in that they might create lava_source but that is not guaranteed and they are usually not deep enough.

The basic idea is, that there is a very hard to get item, which is only found deep underground at the bottom of a lava lake -- the deeper, the higher the chance that the item is there.

For now now two weeks, I try to build such a biome, getting into the noise and mapgen math, tried to adapt paramat's lvm_example and similar mapgen examples. But I just don't get it working.

So, how do you do an underground biome that blends nicely into the surrounding map and reliably places one or two mid-sized lava lakes?

Thanks for you time!

Statistics: Posted by Mik — Fri Apr 17, 2026 23:31