Cerberus

Cerberus is a Greek beast.

Description
Cerberus is a large three-headed dog. It has lion claws and a serpentine tail. It's saliva produces aconite when it falls upon the ground. He guards the gates of the Underworld and he prevents the souls of the dead from leaving.

Mythology
One of the labors of Heracles was to fetch Cerberus from the Underworld. Heracles completed this task with the aid of Persephone.

Family

 * Father: Typhon
 * Mother: Echidna