Muichiro’s demon slayer mark, first revealed during the Swordsmith Village Arc, is a symbol of his unmatched determination to defeat demons and protect humanity. This mark, which only a few have ...

He would have defeated the Hashira as he brought Muichiro to the brink of death. Awakening his Demon Slayer mark was the only thing that helped Muichiro gain the upper hand and defeat Gyokko.