Caduceus is a continuation of the older Indo-European dragon-slayer motif. Wilhelm Heinrich Roscher (1913) pointed out that the serpent as an attribute of both Hermes and Asclepius is a variant of the "pre-historic semi-chthonic serpent hero known at Delphi as Python", who in classical mythology is slain by Apollo. One Greek myth of origin of the caduceus is part of the story of Tiresias, who found two snakes copulating and killed the female with his staff. Tiresias was immediately turned into a woman, and so remained until he was able to repeat the act with the male snake seven years later.
Serpent Men snake-like heads. They possess magical abilities, the most common of which is the use of illusion to disguise themselves as a human. In some stories, the ghost of someone killed by a Serpent Man becomes the Serpent Man's slave. Due to the shape of their mouths, Serpent Men cannot utter the phrase "Ka nama kaa lajerama." Howard's character Kull uses the phrase as a shibboleth in the story "The Shadow Kingdom". These creatures, unlike their kin and predecessors, have the bodies of giant serpents and the heads of human beings, with smaller snakes for hair like Medusa. Man-Serpents have hypnotic