Amdusias is the 67th spirit of the Goetia and a Duke of Hell. He first appears as a unicorn but upon the command of the summoner will take human form, causing music by unseen instruments to accompany the transformation. Amdusias gives excellent familiars to his summoner and rules over 29 legions of infernal spirits. His seal must be worn as a talisman around the summoner's neck or he will not heed any commands.
