Time travel. For mages, it violates their number one rule: what the Mother has written, let no one unwrite. The Mother writes the destinies of the creatures on the world of Karishian. If her writings were undone, it is feared that Creation itself could be undone. The Dark Mage Morgorth takes this rule to heart, but there are others who do not.
Morgorth is about to claim a stone of power when it is stolen from him by a female mage he hasn't seen in decades. As they struggle for the stone, she activates it, and Morgorth is unwillingly plunged into another time and another place. It isn't long before he realizes what time he's found himself in and there are a few familiar faces.
Most notable is a much younger version of Aishe. His mate.