Any demon that is created from muzan's blood is bound by a curse that prevents them from uttering his name, lest they suffer a horrifying death. Webdespite his fearsome reputation among slayers and demons alike, muzan had an illness that almost took his life in demon slayer, resulting in his intense fear of. Webthe biggest villain of the series, muzan kibutsuji, is a figure clad in mystery. Fans have a lot of questions about where he came from, his motivations, and the source. Webas the sun rises and threatens to kill muzan, tanjiro moves in to deliver the final blow. However, he is fatally wounded. Webmuzan and the hashira exchange blows and notices that demon slayers with their mark activated can resist the effect of his demonic blood. As muzan tries to land a killing blow.
