Webmuzan's overconfidence led to the loss of nakime, his most valuable demon.
Nakime's crucial weakness on focusing on only one area at a time was left unaddressed,.
Webmuzan is an unrelenting threat that necessitates the demon slayer corps, as his cruelty profoundly impacts countless individuals' lives in the series.
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.