Incubus

An Incubus is a demon in male form that appears in dreams and takes the form of a man in order to seduce women, usually through sexual activity. The female counterpart is known as a Succubus. Repeated sexual activity with an Incubus may result in the deterioration of health and mental state, or even death. Offspring between a Human and an Incubus is known as a Cambion.

Known Incubi

 * Asmodeus
 * Amaymon
 * Barbatos
 * Sitri

Etymology
Incubus is derived from Late Latin "incubo", meaning "a nightmare induced by such a demon", derived from "incubare", meaning "to lie upon".