Webkokushibo, upper rank 1 demon, wields moon breathing & blood demon art for deadly, unpredictable attacks.
Kokushibo combines swordsmanship with blood.
Webgyokko (玉 (ぎょ) 壺 (っこ) , gyokko?), along with hantengu, was one of the primary antagonists in the swordsmith village arc of demon slayer:
Webhere's taking a look at 5 of the best fights in the demon slayer anime.
First on the list is rengoku, the flame hashira's fight.