The Heavenly Prison's Lowly Guard: Sign-In to Become an Earthly Immortal

In the final years of the Great Qian dynasty, nine princes vie for the throne as demons and monsters wreak havoc.

Lu Yuan transmigrates into the lowest-ranking prison guard in the Heavenly Prison, a life worth less than grass.

Fortunately, he awakens a god-tier sign-in System. Signing in from a prison cell makes him stronger!

[Sign in at the Death Ward prison and receive the max-level Heaven-Suppressing Prison Art!]

[Sign in in the demon consort's cell and receive the max-level Phantom Steps!]

[Sign in in the deposed Crown Prince's cell and receive the Great Luo Sword Embryo!]

While the outside world runs red with blood as the princes fight for the throne, Lu Yuan quietly becomes invincible in prison. Now and then, he gives a fallen prince pointers to help him rise again, wins the heart of a peerless demon consort, and casually crushes a demonic cult leader attempting to escape.

Then, ten years later, the Rebellion of the Eight Princes erupts. Enemy armies and martial arts experts join forces to breach the capital.

As the court officials await death in despair, a sword aura erupts from deep within the Heavenly Prison, reaching straight into the sky.

Lu Yuan steps into the air, his sword flashing cold across nineteen provinces. "Which ants dare disturb my cultivation?"