Hellfire Demon is a humanoid fire guardian of the second chamber of the Labyrinth in the Day of the False Master.
Its body burns permanently, and its weapons and attacks are incandescent. It is combative and attacks when intruders appear. Water neutralizes it temporarily, though it can reignite. Ärsvan and Michel defeated it with a blessed magical scythe.
It is the first of the Labyrinth’s infernal guardians, and possibly summoned by or servile to the Minotaur.