User blog comment:Sosuke Aizen008/Who is the most powerful in stern ritters?/@comment-5398287-20130921193709/@comment-11051098-20130921201210

You mean B, right? Haschwalth is Stern Ritter B.

But I agree - he's the Stern Ritter Grand master, that indicates that he's one of the strongest, if not THE strongest, next to the Emperor.