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.