The book "Sting of Life" was a novel in which the male protagonist was the reincarnation of the God of Plagues. It was about a young man in a mountain village who became strong because of the power of faith. He shuttled between many demons and ghosts and eventually became the immortal of Sting of Life. The outcome was that he became an immortal. I think this novel is very interesting and recommend it to you. I hope you like my recommendation. Muah ~