User blog comment:Imouto-tan/Cynthia Amicus/@comment-4867780-20160302050906/@comment-26362471-20160304130038

While she is pretty strong, she can't battle Sherria one on one as Sherria has this:

"Immunity Bypassing- She can even bypass the immunity of being nigh omnipotent and having omni-negation."

Which includes "Ultimate Nemesis" as something that Sherria can bypass, but Sherria's magic doesn't effect her completely, only damaging her slightly.

"Ultimate Nemesis" is ability that cannot be explained by science or magic and should be impossible to have as it's very nature is a paradox; a magical Jewel ability that negates everything and anything with very little that can stop her. While the Hibiki Units and certain magical items can nullify her power for a time; she is basically the closest thing to a Deus Ex and is unstoppable.

She may or may not be the living embodiment of the Counter-Force.