Cerberus

The Three-Headed Guardian of the Gate, the copper-voiced hound who ensures that the transition between life and death is a one-way street. His three heads represent the past, the present, and the future—all watching the entrance to the house of Hades. He is the fierce loyalty of the earth to its secrets, the one who reminds us that the threshold of the sacred must always be guarded by a force that cannot be bribed.