Ogama is the weapon of Akechi Rekai. They are a pair of scythes made by him that, they are designed to be used as a spear as well. On top of the blade of the scythes is a small blade that points up. That part of the scythe can be used for thrust attacks or slicing attacks. Also on the opposite end of the scythes bigger blade, are 2little points that can be used as a weapon as well, but they don't do that much damage. He can infuse chakra into this weapon to increase damage further.