Kyūjūrokkei Kakafūmetsu

is a Kidō seal created by Kisuke Urahara specifically for use against Sōsuke Aizen.

Description
Activating on its own when the target is weakened, it pierces them from the inside out with several cross-shaped beams of light, which merge into a single, vaguely star-shaped barrier, with the target sealed inside.

Incantation
Unknown.

Known Practitioners

 * Kisuke Urahara