User blog comment:Soulreaper1234/Why does Urahara Kisuke hid the Hogyoku inside Rukia's soul?/@comment-2038785-20100512131959

Well yeah to Aizen it was like a carrot on a stick but it still must have adleast some power and i mean a lot cause it runs on will power to put it simply as aizen said so it must have a shed load of power to do that.

Mabye it's a kind of forbidden power like the Bakkōtō the more you use it, the more powerful you become but if you use it too much you die a horrible horrible death.