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Typhon, the enemy of the Olympian gods, is described as a vast grisly monster with a hundred heads and a hundred serpents issuing from his thighs, who was conquered and cast into Tartarus by Zeus, or confined beneath volcanic regions, where he is the cause of eruptions. Typhon is thus the chthonic figuration of volcanic forces. Serpent elements figure among his offspring; among his children by Echidna are Cerberus (a monstrous three-headed dog with a snake for a tail and a serpentine mane); the serpent-tailed Chimaera; the serpent-like chthonic water beast Lernaean Hydra; and the hundred-headed serpentine dragon Ladon. Both the Lernaean Hydra and Ladon were slain by Heracles.