I recommend the book," The Gods of Heaven ", to you! This was a fantasy novel about a high-level martial arts world. The core power of this novel was the ability to use blood as a gift. The blood sacrifice tool would produce some special abilities as a derivative of the ability. The main character's power system was simple. There would not be any random bonuses or halos. There would only be the main character's unique abilities. I hope you like my recommendation. Muah!