Demon

A demon, daemon or fiend, is a supernatural, often malevolent being prevalent in religion, occultism, literature, fiction, mythology and folklore.

In Ancient Near Eastern religions as well as in the Abrahamic traditions, including ancient and medieval Christian demonology, a demon is considered an unclean spirit, sometimes a fallen angel, the spirit of a deceased human, or a spirit of unknown type which may cause demonic possession, calling for an exorcism. In Western occultism and Renaissance magic, which grew out of an amalgamation of Greco-Roman magic, Jewish demonology and Christian tradition, a demon is a spiritual entity that may be conjured and controlled.