Dark Elves were created to bring pleasure by the Goddess Rhae. Her pleasure! But when the Gods left the planet she left them behind, only realizing that they needed mates. So She gave them enchantments to be able to take human women and procreate. The only hitch is they can only sire males. Now they live underground and surface at night to grab those females that can become true mates . Oh and did I mention they have to bespell the females to change so they can survive the delivery of said offspring!?