Echidna

Echidna was a monster, part woman and part snake. She was the daughter of Phorcys and Ceto, or perhaps of Tartarus and Gaea.

By Typhon, Echidna was the mother of many monstrous offspring: Cerberus, Chimaera, Orthus, the Hydra, the Nemean Lion, the Sphinx, the Caucasian Eagle, the Crommyonian Sow and vultures.

Though Echidna never grew old, she was not immortal. Echidna met her death at the hand of Argus Panoptes.