Sword of the Bone Dragon

Sword of the Bone Dragon (Sorirōhone, 刀 竜 骨) Called sword, but it is more like a whip, Its  a blade is composed of small blades which held together by a hard wire, giving the blade the ability to extend or retract  at will. Because of this unique design, the specialty of this sword is the long range combat and not at close range. While the structure of the blade allows you to cut through even the hardest hordes of enemies with a simple movement.

Description
It is a sword of about twenty spikes of sabers that are hidden only in a blade. When used to attack, the spike of the blade are forming the shape of a spine. It is a fairly large, fast and accurate weapon, which makes the user  a difficult opponent.