Cerberus - Final Fantasy Summon Mythology

In Greek mythology, Cerberus, son of Typhoon and Equidna, was the guardian in the gates of Hades, the realm of the dead. In appearance, Cerberus was a gigantic size of a dog, which had three heads (or 50 according to different versions), a snake tail and on his back and thick layer of snakes heads. Its mission at the gates of the kingdom of the dead was to prevent any alive human being