Lucas was stumped when he heard it. But if that was the case, it made sense since even a high-ranking Lotus Prince did not even make any progress yet.
Speaking of Lotus Prince, Lucas was reminded of the ranking system Angst had explained. It was about the difference between a B-Rank and an A-Rank. Lucas then asked Lilith what ranked Explosion Magic Art was, and he received a reply with a distressed tone:
'Explosion Magic Art is a peak level Earth Grade Art.'
Lucas frowned when he heard Lilith's ashamed tone and scolded her for being ashamed of the Art she possessed. After all, for him, it was already an overpowered Art, so what was he asking for? He was only curious about its grade, that's all.