Buer is the 10th spirit listed in the Goetia and a president of Hell who commands 50 legions of demons. He teaches natural and moral philosophy, logic, and the virtues of all herbs and plants. He can also heal infirmities and gives good familiars. His appearance differs across the descriptions; Johann Weyer's Pseudomonarchia Daemonum describes him manifesting as a star, the Ars Goetia as an archer, and the Dictionnaire Infernal as a lion's head surrounded by several goat legs. According to the Grand Grimoire, he is a direct subordinate of Agaliarept.