The earth demon changes in seventy-two ways, and every change is a supernatural power. A magical yellow-shell book sent Li Changan back to the ancient world. Every time he killed a demon, he would get a supernatural power. Painted skin ghost, zombie king, spider demon ...Monsters fell under his sword one by one. Obsession, swordsmanship, demon slaying...all the supernatural powers were obtained from the book. When he exterminated all ghosts and drew his sword and looked around, he realized that all these were just before the rolling tide. A small wave.