"The 
Hōgyoku (崩玉, 
Crumbling Orb; 
Viz "
Breakdown Sphere") is a small, bluish-purple orb composed of a unique substance thought to have been capable of dissolving the boundaries between 
Shinigami and 
Hollow, allowing one race to attain the powers of the other. However, its true power lies in its ability to sense the hearts of those around it and materialize their deepest desire.
Two Hōgyoku are known to exist, the first invented by 
Sōsuke Aizen and the other by 
Kisuke Urahara. Ultimately, Aizen merged his orb with the latter's, forming a single Hōgyoku."
@Mashiro Blue your name is mentioned here.
I assume Aizen gets a power-up, but Ichigo and co join town in return ?