Raikiri

The Raikiri is a legendary sword given to Kanami by Deneb. According to legend this sword was created by a legendary blacksmith. The blacksmith gave this sword the name Chidori, but when he was able to cut lightning with it he changed the name to Raikiri and ever since rumors say that the sword that can slay a thunder god. The myth continues to say that this sword was supposedly blessed by the Thunder God. This hasn't been proven and it was most likely Deneb's doing, but it certainly has abilities that suggest it was blessed. One such ability is that, it can be summoned by calling its name with the right hand extended upwards, palm upwards. Once its name has been called, thunderclouds form and lightning streaks down from the sky, towards Kanami's hand, but right before it hits her hand the lightning bolt turns into the sword. To dismiss the sword, Kanami extends her hand upward and says Chidori, which would then cause clouds to gather above and then cause lightning to strike the sword. Upon striking the sword, the sword will turn into lightning and go back up to the clouds with the lightning bolt. Another ability is that this sword's durablity and cutting power triples during a thunderstorm or whenever it is hit by lightning. It has been shown that it can block weapons that create blades made out of a pure energy substance during during thunderstorms. An advanced user of this sword is able to create and manipulate the weather with this sword, but that takes four years of training, while Kanami has only trained with it for three years. The last, and possible most useful ability is the ability of turning the blade into a blade made of pure lightning. This allows it to cut through most objects with relative ease.

Trivia

 * Deneb plans on giving the sword to Kanami Caust when she has completed her training.
 * Raikiri is not based off of the technique in the Naruto series, but rather a sword created by Tachibana Dōsetsu.