Cerberus (Shin Megami Tensei)

In Greek mythology, Cerberus, also known as Kerberos, is a monster and pet under Hades that guards the gates of the Greek underworld, the realm of Hades. It is generally depicted as a vicious, gargantuan dog with three heads, although accounts may vary. Cerberus is in fact the Latin transliteration of the Greek name Kerberos.