Minecraft wiki entry for Development_versions, associated text: Generate in all Nether biomes, except basalt deltas.
Four types of structures generate: Bridge, Hoglin Stables, Housing Units, and Treasure Room.
Are the only source of the "Pigstep" music disc and piglin banner pattern.
Piglins and hoglins spawn here.
Spawners that spawn magma cubes can be found in bastion remnants.