The Kabutowari
Helmsplitter is a blunt sword that can break through any defense. It is wielded by Jinin Akebino. The sword consists of a giant ax and hammer linked end to end by flat thin leather like rope. First the wielder attacks by making a nick in the opponent's weapon, then follows up by slamming the hammer on the blunt side of the ax downwards to hit past and slice the opponent.