Succubus

A succubus (pl. succubi) is a female demon who is described in various folklore as appearing in the dreams of male humans in order to seduce them. Repeated interactions between a succubus and a man will lead to sexual activity, a bond forming between them, and ultimately sexual intercourse, as she requires semen to survive. The establishment and perpetuation of such a relationship enables the production of a hybrid offspring known as a cambion, but at the expense of the man, whose mental and physical health will deteriorate rapidly, eventually resulting in his death if the succubus continues courting him for a protracted period.

In modern representations, a succubus is often depicted as a beautiful seductress or enchantress, rather than as demonic or frightening, to attract people instead of repulsing them. The male counterpart to the succubus is the incubus. Historically, folkloric belief in succubi was motivated by distressing nighttime phenomena, chiefly wet dreams and sleep paralysis.