Sign-In System: My Billion-Fold Critical Hits Shatter the Heavens!

Reborn as the scorned bastard prince of Zhenbei Kingdom, he awakens a heaven-defying sign-in system that grants rewards with every check-in—and a chance for billion-fold critical multipliers each month! After a thousand years of relentless cultivation through daily sign-ins, he stands at the apex of all realms, issuing one final challenge to the heavens: "Who among you dares face me?"