The legends go that the first incubus was born of a demon and angel. Abandoned by both parents on earth, he became jealous and searched for a way to increase his power so as to destroy them. He found that through sex he was able to absorb the life force of a human.
The Morrigan is a Celtic goddess of battle, strife, and sovereignty. She sometimes appears in the form of a crow, flying above the warriors, and in the Ulster cycle she also takes the forms of an eel, a wolf and a cow.