Lich

You should not have set foot through that door, because the ground beneath you crumbles away, causing you slip down through a dark and slimy passage. What is this place? It appears to be an ancient crypt. The huge stone lid of a sarcophagus grinds open to reveal a putrid corpse with rotting skin and demonic red eyes. You hear a deep groan, the groan of the disturbed and ancient dead...

Is it halloween yet? :)