This Cheat Is Way Too Powerful

(Fast-paced, invincible protagonist, ruthless and decisive)

The heavens change.

Humanity perishes.

A sudden catastrophe of blood mist sent the once-mighty cultivators crashing from their lofty heights. After flourishing for tens of thousands of years, humanity fell into decline once more, while the demon race rose again.

Was it all a conspiracy, a coincidence, or the return of the ancient and powerful clans?