According to the information provided, I recommend the novel Infinite Devouring Evolution Begins from a Cat. The novel was a fantasy novel about a cat that devoured and evolved in a world with recuperation of reiki. In this world, humans awakened and all kinds of spiritual beasts appeared. As a cat that could evolve, it outstandingly defeated all its opponents and finally became a peak demon emperor. The male protagonist devoured the soul fragments of others, adding suspense and mystery to the story. I hope you like this fairy's recommendation. Muah ~😗