I'm the Fourth Cataclysm in Warhammer

In the grim darkness of the far future, one man rewrites the rules of the Imperium itself. Founding the Second Empire, defying ancient AI prohibitions, establishing a forbidden state religion, and purging the High Lords in blood—he stops at nothing. When Mars itself falls under his divine judgment from the Colossus, the galaxy trembles. Yet through every heresy and every slaughter, his oath remains unbroken: absolute loyalty to the God-Emperor. In a universe where there is only war, he becomes the Fourth Cataclysm—the player who turns the grimdark into his personal playground.