Hell Armored Bones are post-Plantera Hardmode enemies that spawn in the Dungeon after Plantera is defeated. Similar to Angry Bones, they come in multiple forms, follow the Fighter AI, can open doors after a few hits, and are immune to the On Fire!, Poisoned, and Venom debuffs. Hell Armored Bones inflict the On Fire! 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 water.
Hell Armored Bones are most common in Dungeon areas with Tiled Walls.