Kubikiribōchō

Kubikiribōchō
("Executioner's Blade"; Literally meaning "Decapitating Carving Knife"): A giant sword with a butcher-knife-like appearance, the wielder can use the semi-circle on the blade to decapitate an opponent's head, hence the name. The sword has an ability to regenerate using the iron absorbed from the blood of those it cuts down. It is also called a "Seversword"