Bakuzan

Secret Sword Bakuzan is a special sword used by Satsuki Kiryūin with the ability to cut Life Fibers. It was split into Bakuzan Goko and Bakuzan Kōryo after Satsuki is defeated by Ragyō Kiryūin.

Secret Sword Bakuzan
Satsuki Kiryūin owns Secret Sword Bakuzan, and it appears as a black katana, and is very powerful, able to fight evenly with the Scissor Blade. After it is broken, it is shown at the end of Episode 19 that Satsuki has a shard hidden under her toenail.

Bakuzan Gako
The Bakuzan Gako appears as a small dagger and is wielded by Nonon Jakuzure.

Bakuzan Kōryo
The Bakuzan Kōryo is larger than the Bakuzan Gako, appearing to be a short sword. It is wielded by Ira Gamagōri at first, but is given to Uzu Sanageyama as Gamagōri states that it is "more your thing".