Proof of mastery. When they heard these words, Nina and Jino looked at each other. This was a title that neither the two Sword Emperors, nor Ghyslaine had been given. The proof of mastery was that amazing of a title.
"Though it'd also be fine to jump you straight up to Sword Emperor but... you'd have to fight Ghyslaine here. If you want to jump up to Sword God then you'll have to kill me.