According to Johan Weyer, Bune is a most powerful demon, one of the Grand Dukes of the Infernal Regions. His form is that of a man. He does not speak save by signs only. He removes corpses, haunts cemeteries, and marshals the demons around tombs and the places of the dead. He enriches and renders eloquent those who serve him. Thirty legions of the infernal army obey his call. The demons under his authority are called Bunis and are regarded by the Tartars as exceedingly evil. Their power is great and their number immense. But their sorcerers are ever in communication with these demons by means of whom they carry on their dark practices.
Weyer, Johannes. Witches, Devils, and Doctors in the Renaissance: Johann Weyer, De Praestigiis. Edited by George Mora. Binghamton, N.Y.: Medieval and Renaissance Texts and Studies, 1991.