As the night progresses the group discovers that they are not alone and that three succubi inhabit the house, imprisoned by a warlock's amulet.
In this movie, an immortal monk hunts down two succubi.
In a later storyline, she reveals that succubi gain their power by loving others, and a succubus who can not love will eventually die.
The amulet would give its user the ability to control the succubi, giving them extreme amounts of power.
