Helmasaur King

The Helmasaur King guards the First Crystal in the first dungeon of the Dark World in A Link to the Past. He is a large quadrupped creature with a large mask on his head. Before he can be damaged this mask must be destroyed with the Magic Hammer or the Bombs. Under it appears a large green emerald on his forehead which can be hit with the arrows and the sword. When he is defeated he leaves a Heart Container and the First Crystal in which one of the seven maidens is prisoned.