Kageoni

is a technique of Shunsui Kyōraku's Zanpakutō, Katen Kyōkotsu.

Description
The rule of this game is whoever gets their shadow stepped on "loses". The game itself allows competitors to manipulate shadows to their advantage. Shunsui has hid himself in shadows by using this technique, and he can control the shadows and use them to attack an opponent by attacking the shadow they are currently standing upon.