Kanabo

It was constructed out of heavy oak wood, and covered with some form of metal from the end to the middle, with metal studs along the metal-shod end. It was this later version that many popular pictures of Japanese demons carry.It was usually a very heavy weapon.
Because of its sheer weight, only a few soldiers carried it. It was more of a mythical weapon, often used in tales by the great Japanese demons "oni" since the oni were extremely strong and could carry these mammoth weapons and so were feared by many superstitious people.