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.
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.
One of the techniques muzan possesses, black blood:
Brambles, is a blood demon art that creates thorny tendrils that sprout out of his arm.