User blog comment:B214/Question & Answers 5/@comment-26821288-20160322160430

I remember reading somewhere in the LN or here, that the amount (of Evil Pieces) that are needed to reincarnate is determinded by the Devil's (the "Master" Devil's) own strength, or something like that.

With that in mind, how could Mephisto possibly reincarnate Tannin as his Queen? Is Mephisto super strong or something, by any chance?