Invincible: Slaying Demons in the Heavenly Prison

After transmigrating to another world, Qin Xuan finds himself in a heavenly prison from the start.

Demons run rampant, and his colleagues are being slaughtered.

It should be a death sentence, but Qin Xuan discovers that he can earn rewards by slaying demons.

Secret arts, miraculous techniques, spirit pills, divine weapons: bring them all to me.