The amulet would give its user the ability to control the succubi, giving them extreme amounts of power.
In a later storyline, she reveals that succubi gain their power by loving others, and a succubus who can not love will eventually die.
In this movie, an immortal monk hunts down two succubi.
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.
