 Calis, being human, elven and Valheru, managed to undo the Lifestone over a period of many hours and amidst a battle with Jakan, a demon who sought the Lifestone for his own selfish gain.After defeating Jakan, the Lifestone (Which had the Valheru trapped inside) was destroyed forever, and with it the Valheru.Calis and Tomas/Ashen-Shugar suffer a painful transformation as this occurs, as their Valheru parts are "returned to the world", but being "more than Valheru", they survive.