Bakusaiga

Bakusaiga(爆砕牙 lit. Explosive Crushing Fang) is a sword from the manga series (Chapter 518 entitled "Bakusaiga") InuYasha that was created from Sesshomaru's own body. The Bakusaiga came from Sesshomaru's body attached to finally regenerated arm. It is unique as it is the only yokai sword not forged from a 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 with a sword not fit for fighting. A yokai born from the Shikon no Tama itself 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 choosing 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 appears 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 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 uses the Bakusaiga to defeat Magatsuhi and destroy his physical body. After the battle Sesshomaru claims Bakusaiga as his 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 still carried by Sesshomaru.

Abilities
Bakusaiga is a sword meant to cut the flesh as opposed to the Tenseiga which is meant to revive the dead.

Decomposition: The sword is the polar opposite of the Tenseiga, as it has the power to decompose any organic material that its blade comes in contact with, nullifying any regenerative abilities while doing so. Miroku comments that Naraku would suffer the same affliction should he absorb any demon wounded by Bakusaiga. The blade itself is the manifestation of Sesshomaru's own true power, born from his detachment of InuYasha's Tetsusaiga.

Destructive Wave: The Bakusaiga can also release a huge wave of energy made of yoki which is similar to the Kaze no Kizu, only much stronger. While the Kaze no Kizu can kill 100 yōkai at once the Bakusaiga's yoki release is shown to able to destroy an even larger amount of yokai (1000 demons in one swipe).