Aldrusy is a demon in the hierarchy of the wandering prince Uriel, at least according to the Ars Theurgia. Aldrusy holds the rank of duke and has six hundred and fifty lesser spirits to serve beneath him. He takes the form of a massive serpent with a human’s head. He is a dishonest spirit, both stubborn and utterly evil.
SOURCE:
The Dictionary of Demons written by Michelle Belanger