The Void Emperor's Infinite Evolution

The Void was never meant to exist. Before heaven, before gods, before creation itself... There was only the endless abyss. When the Void was finally sealed, fragments of its power scattered throughout existence. One of those fragments chose him. Betrayed and left to die inside humanity's most dangerous dungeon, Kael expected death. Instead, he awakened the Infinite Evolution System. Every enemy he devoured became part of him. Every bloodline he consumed became his. Every evolution shattered the limits of life. Dragons. Angels. Demons. Titans. Even the gods would one day become prey. But with every evolution, the Void whispered louder... "Become whole." And somewhere beyond reality, something was waiting for the day the Void Emperor returned. — Description from novelcodex.org