In Western medieval legend, a succubus (plural succubi) or succuba (plural succubae) is a demon who takes the form of a beautiful woman to seduce men (especially monks)in dreams to have sexual intercourse. They draw energy from the men to sustain themselves, often until the point of exhaustion or death of the victim. From mythology and fantasy, Lilith and the Lilin (Jewish) and Lilitu (Sumerian) are, in redactive Christian fables (folktales not part of official Christian theology), considered succubi.