Frostfire caves

The Frostfire caves are cold deep caves biomes meant to replace the Deep dark before it was available in 1.18. To do so, the biome has its own aesthetic, mixing blue fire and ice in what seems to be a handbuilt area. Being a replacement for the Deep dark, Sculk sensors are scattered around this mysterious biome, but like the Deep dark, it will be difficult to get them.

Changelog
Made more common.