This story is a sequel to The Rise Of The Eternal Gaurdian

Thanatos, the god of death, returns from a long banishment from the land of the dead. He comes a changed god, on the side of good. He also brings a message, a way to change the past. The cost is merely giving up everything she ever done to restore the past and secure Equestria's future. Will Twilight let go of her destiny to give life back to those lost during the battle with Kaorn...