Ittō Kasō

Description
Ittō Kasō is a forbidden offensive technique. The practitioner can only activate the spell by using their own body as the catalyst. Due to this effect, Sōsuke Aizen referred to it as the spell of sacrifice. The spell causes a massive pillar of red fire to erupt from the ground in the shape of a giant katana's tip. By using this spell, Genryūsai Shigekuni Yamamoto lost his left arm.

Incantation
Unknown.

Known Practitioners

 * Genryūsai Shigekuni Yamamoto