Spiritsu

A spiritsu is a weapon that a warrior can weild. A spiritsu is a weapon that has a living spirit in side of it. The origin of this weapon is unkown, but it can be extremely powerful and dangerous if the warrior has ability that no one can match

Power
The power of Spiritsu is different for each warrior. But, all spiritsu weapons have the ability to transform their weilder depending on their power. With each stage of the weapon power, the weilder physiology changes as well. With this weapon the weilder can communicate with the spirit inside the weapon, communicating through telepathy or verbally.