Webdemons in demon slayer gain strength by consuming humans and develop unique abilities through blood demon arts. Some blood demon arts, like the infinity. Webas we know a part of muzan's bda is the ability to fully control the flesh in his body but after ubuyashiki nukes him and he is getting attacked by the hashira, he proceeds to use a. Webmuzan kibitsuji is the king of demons and, as such, has the strongest blood demon art of any demon. Besides being immortal and having absolute dominion over.
