Bakusaiga

Bakusaiga(爆砕牙 lit. Blast Fang) is a sword from the manga and anime series InuYasha that was created from Sesshomaru's own body. it is unique as it is the only yokai sword not forged from yokai's fang. It is Sesshomaru's final signature sword.

History
Sesshomaru having given the Tenseiga's only offensive technique the Meidou Zangetsuha to the Tessaiga is once again swordless. A yokai born from the Shikon no Tama it's self called Magatsuhi appears before Sesshomaru in order to steal the last shard of the jewel from Kohaku, who is traveling with Sesshomaru. A battle erupts with Sesshomaru quickly losing, InuYasha comes to his aid, but he refuses to allow his younger brother to aid him, because he is still bitter towards his father for chossing InuYasha as his successor instead of himself. Sesshomaru loses his remaining bitterness toward InuYasha and desire for Tessaiga which allowed his left arm to regenerate along with a sword in it.

Totosai appear and reveals that the sword is the Bakusaiga created from Sesshomaru's own body, and that the Inu no Taishou gave Sesshomaru Tenseiga not only for him to master a technique just to give it up to InuYasha but to force him to go on a journey for him to lose his desire for Tessaiga and become a full fledged daiyokai(his desire for his father's swords prevented him from becoming one). Sesshomaru use the Bakusaiga to defeat Magatsuhi and destroy his physical body. After the battle Sesshomaru claims Bakusaiga as true signature weapon.

Sesshomaru uses Bakusaiga for the rest of the series to battle both Naraku and Magatsuhi. During the Final Battle against Naraku the Bakusaiga is used to destroy most of Naraku's body. In the final chapter set three years after Naraku's defeat the Bakusaiga is stilled carried by Sesshomaru.

Ablities
Bakusaiga is sword meant to cut the flesh as opposed to the Tenseiga which is meant to revive the dead. The Bakusaiga can decompose any organic material that it cuts, breaking it down until there is nothing left, it stops the regenration ablities, making it the perfect weapon against Naraku. Because of this ablitiy even a flesh wound caused by the Bakusaiga will eventually destroy the entire body of a enemy. The Bakusaiga's decomposing power is continuous and if anyone absorbs a yokai who was cut by the blade will also recieve the same damage as them, until their own body is completely destroyed.

The Bakusaiga can also release a huge wave of energy made of yoki which is simliar to the Kaze no Kizu, only much stronger. While the Kaze no Kizu can kill 100 yokai at once the Bakusaiga's yoki relase is shown to able to destroy a even larger amount of yokai.