Minecraft wiki entry for Best_biomes_for_homes, associated text: Three notable structures generate in the Nether, those being nether fortresses, bastion remnants, and ruined portals. Nether fortresses offer useful loot such as nether warts and blaze rods for brewing, saddles for striders, iron/gold ingots, obsidian, and diamonds. Wither skeletons can drop their skulls, which can be used in conjunction with soul sand/soil to summon the wither. Bastion remnants offer an abundance of blackstone, chains, and gold blocks, as well as a variety of gold and (rarely) netherite related items. The pigstep music disc can also be obtained here. Ruined portals are incomplete nether portals often accompanied by crying obsidian, a gold block or two, and likely a chest containing some gold and a flint and steel to ignite the portal, if the player has enough obsidian to restore it.