The oldest of Goddesses, the Bound Goddess Sariandi, exists in many forms.  When Aias and Elena release one of her avatars on an unsuspecting world, she grants them both a gift.  Well, she calls it a gift.  The more traditional term is "Sariandi's Curse," and Aias and Elena set off to right the wrong they started, learn, grow, and maybe save a few lives.  If they really have to, and it's not too inconvenient.