Cerberus is the three-headed guard dog of the Greek underworld. He is the son of the monsters Typhon and Echidna, and the servant of Hades, god of the dead. It is his duty to ensure that only the souls of the dead are allowed into the underworld, and no one is permitted to leave. He is a truly fearsome creature to behold, and a deadly foe to face. However, so long as you do not attempt to pass by him, you should be safe.