Muzan's Blood Demon Art is called “Biokinesis”, which grants him the ability to manipulate his body at will and shapeshift instantly. Though all demons have this innate ability, Muzan takes it to another level by changing his flesh and organs. He then molds them into the form he wants to take. Upper Moon One: Kokushibo. Upper Moon Two: Doma. Upper Moon Three: Akaza. Upper Moon Four: Nakime. Upper Moon Four: Hantengu. Upper Moon Five: Gyokko.