Succubi

A succubus (pl. succubi) is a female demon who is described in various European 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 child 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 woman seductress or charming, rather than as demonic or frightening, to attract people instead of repulsing them. The male counterpart of the succubus is the incubus. Historically, folkloric belief in succubi was motivated by distressing nighttime phenomena, chiefly wet dreams and sleep paralysis. In medieval Europe, union of a incubus or succubus and a human was supposed by some to result in the birth of beings half-demon and half-human children. Legendary magician Merlin was said to have been fathered by an incubus. Walter Stephens writes in his book Demon Lovers that some traditions hold that repeated sexual activity with an incubus or succubus may result in the deterioration of health, an impaired mental state, or even death.