地狱装甲骷髅 are post-世纪之花 困难模式 enemies that spawn in the 地牢 after Plantera is defeated. Similar to 愤怒骷髅怪, they come in multiple forms, follow the Fighter AI, can open doors after a few hits, and are immune to the 着火了！, 中毒, and 毒液 减益s. Hell Armored Bones inflict the 着火了！ debuff for 10 seconds / 20 seconds. They are visible in darkness, but do not actually emit light, except for a faint glow when immersed in 水.
Hell Armored Bones are most common in Dungeon areas with Tiled Walls.