Ittō Kasō

Description
A forbidden technique that can only be activated by using one's own body as a catalyst; 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 katana's tip. By using this spell, Genryūsai Shigekuni Yamamoto lost his left arm.

Incantation
Unknown.

Known Practitioners

 * Genryūsai Shigekuni Yamamoto