User blog comment:Xilinoc/Ch. 546 - THE LAST 9DAYS/@comment-5551986-20130717085558

Good review. I "think" the shield around Sereitei might be that thing that Ichigo and friends had to bypass at the beginning.

But "he would regain the world after 9 days"? seems vague, but why Soul Society? Was it his originally or something silly? Seems like we got a GoT reference going on here, subtly hinted here. A little changed but. "He would watch his 'world' burn so he could be king of the ashes"

Yhwach makes no sense, why destroy a world he wishes to conquer.