Bastion Remnant

Bastion remnants, also simply referred to as bastions,[1] are large, castle-like generated structures found in the Nether in all of the biomes except basalt deltas. They generate in four distinct variants, each with a unique structure and set of loot. Piglins and piglin brutes spawn in these structures on generation, and hoglins may also spawn on generation in the bridge and hoglin stables variants. Bastion remnants are the only place to find gilded blackstone, the Pigstep music disc, the snout banner pattern and armor trim, monster spawners which spawn magma cubes, and the netherite upgrade smithing template.

Bastion remnants generate in all Nether biomes except basalt deltas, although a bastion may extend into one. If a bastion tries to generate in a basalt delta, the bastion does not generate and a Nether fortress generates instead. To generate the structure, the game splits the Nether into regions, in which either a Nether fortress or a bastion remnant can generate. The regions are 432×432 blocks in Java Edition and 480×480 blocks in Bedrock Edition. Each region has a 4-chunk separation located on the south and east borders of the region in which neither a fortress nor a bastion can generate. This leaves only a 368×368 block section in Java Edition or 416×416 block section in Bedrock Edition where a structure can generate. Two structures never generate in the same region, although they might overlap if they generate close to the separation border. In Java Edition, the chance of a bastion generating instead of a fortress is 3⁄5 (60%), while in Bedrock Edition the chance of a bastion generating instead of a fortress is 2⁄3 (66.6%). Each of the four variants of bastion remnants has an equal chance of generating.

Piglins, piglin brutes, and hoglins that spawn upon generation in bastion remnants neither despawn naturally nor do they hunt each other. Piglin brutes also spawn exclusively here upon structure generation, and do not despawn unless killed, or if difficulty is set to Peaceful. Like shulkers in end cities, once these mobs are killed, they do not respawn, though the bastion remnant continues to spawn normal mobs depending on the biome it is located in.