After the decision made by the [[Angiris Council]] for the fate of [[Sanctuary]] and its inhabitants, the world would not be destroyed, but everyone (excluding the Nephalem because their time was almost up anyway) had to have their memory erased and "reset" so none of the battles of [[Uldyssian]] and his [[Edyrem]] would be remembered. After [[Imperius]] created the wave of white light that reset everyone's mind, including [[Achilios]] and [[Serenthia]], and also reset human existence back, we later discover that [[Trag'Oul]] saved Mendlen's mind from being wiped, so he could forever remember his brother, write about his experiences, teach others his ways, and also maintain the balance.