Karcen
Ten Thousand Club
her wish would be be able to protect Yui now to keep with the wish she must have the power to defeat whatever they come across as otherwise the wish isn't fulfilled because she wouldn't be able to do so this means Katja would have to either be one punch man levels of power so nothing could ever be a threat to yui or she would have to constantly scale in power so she can protect yui otherwise the wish would not be granted it is redundant wish because it constantly requires more power to protect from more poowerful threat