Gōkei

is a technique of Byakuya Kuchiki's Bankai, Senbonzakura Kageyoshi.

Description
Swirling around the opponent in a spherical formation, the blade petals of Senbonzakura Kageyoshi fly into the target from every possible angle, leaving no blind spots and no possibility of escape, before collapsing in on themselves, destroying the opponent. It is strong enough to completely obliterate a very large building from the inside out, and the resulting shockwave generated by the attack is powerful enough to force Byakuya himself to move away with Shunpo.