Emperor in the Apocalypse

On a seemingly normal day, Mana wrecked havoc within earth. Millions of humans suddenly turned into zombie unable to adapt to Mana.Yet along with Mana came an opportunity, one that allowed humans to transcend mortality and gain unimaginable power in the form of a System. Witness the Journey of Kain, a man who strives for power and simply enjoys his life doing whatever he wants, without caring for morality and such.