I know this isn't the most orriginal idea but i'm thinking about the comming of the next leveler(be it Alric or other) with Myrdred still living but not exactly on the light side. This new leveler will battle his way and destroy everything(traditionaly) and it will look as he will destroy all that remain in one final attack(as he should coz the dark age should come). But in the final stage Myrdred will come with a dark(undead) army of his own and battle the leveler. He will die in the process and kill the Leveler thus destroying the cykle.
Should I write anything more i'd spoil it. Anyhow I plan to mainly write about the last battle and to uncover Myrdreds mysterious mind and plans from all his life.
"You are a fool, but a powerfull fool. Ha you want my aid? I shall give it to you. And disciple, let the Watcher know who has aided you in his defeat!"
Almindor