Meidō Zangetsuha

Meidou Zangetsuha is a technique that creates a path that sends anyone who is hit with it directly hell, killing them without actually harming them. The technique originally belonged to the yokai Shishinki.The Inu no Taishou battled Shishinki and defeated him with the Tessaiga and used it to steal the technique. Because of the techniques dangerous ablitiy the Tenseiga was created to contain it.

The Meidou Zangetsuha creates a massive black circle that will send a entire body into hell, leaving no trace left behind. However when one is first learning to use the technique the Meidou will take the form of a black cresent moon that will only send a part of person into hell along with their soul, stronger yokai may be uneffected by the cresent Meidou. As the user gains strength the Meidou will grow until it becomes a perfect circle. When Totosai unlocked the technique in Tenseiga Sesshomaru could create a cresent shaped Meidou.

As Sesshomaru gained strength the Meidou became bigger, than became a oval shape, and finally a perfect circle. Seeshomaru gave the Meidou Zangetsuha to InuYasha by allowing Tessaiga to absorb it.

When InuYasha mastered the Meidou Zangetsuha the technique evolved into a new technique that matched Tessaiga's nature of a sword that cuts. The new Meidou takes the form of a blade that can cut opponents and send their remains to hell. The new Meidou gains the ablitiy to cut while keeping it's original power intact.