Warden of All Hells, I Sealed the Heavens with My Own Hands

He was once the "Prison-Suppressing Dragon King" who trembled in the world. Using the nine secret treasures as keys and himself as the lock, he sealed the eternal disaster into the endless abyss and ended the catastrophe of the world. Ten thousand years later, the heavens forgot his sacrifice. The rusty chains penetrated the divine bones, and the nine heavenly shackles nailed him to the throne of the rotten bone layer - now he is a forgotten prisoner in the deepest part of the abyss, and the nominal warden of this purgatory.