Starting from The Witcher, he slaughtered his way across the world.

Under a dark sun, where daylight never returns, demons rise. Some, upon death, are imbued with demonic energy, transforming into demons themselves; the stronger their obsession, the stronger their demonic power. Even if they were your family and friends in life, after becoming demons, they will still be ruthless and merciless, killing without mercy. Thus, the profession of Demon Hunter was born, dedicated to fighting "demons." Becoming a Demon Hunter is no easy feat. Luo Fan, who transmigrated here, discovers he possesses a panel that can enhance everything. As long as he gains points, he can enhance all inanimate objects. Relics, magic spells, magic, items, potions... with enough points, even an ordinary dagger can be enhanced into a peerless divine weapon. ...The world's fire is about to be extinguished; Demon Hunters are the last spark. Luo Fan, clad in a black robe, walks through the darkness. "Only by slaughtering his way through this world can everything be ended!"