Hei Yuan Liming Shi

Monsters have overrun the world following the emergence of the "Dark Abyss," an inter-dimensional portal. A group of mages, called portal protectors, work to contain it. Baiyu is considered the most powerful among them, but his arrogance leads to a fatal mistake when he faces an unexpectedly strong enemy. He dies but is later reincarnated two years later into the body of a teenage boy. With divine power granted in this new life, Baiyu seeks to prevent the world from descending into darkness.