It's discount Berserker from F/Z!
Boy, you were referred to this dungeon to train your swordsmanship. Not play healer in the back like he always did. Additionally, the knights are C-ranked so an A-ranker like him should be able to fight them even with his rudimentary sword techniques. It would offer a challenge since they're only weak to crushing and not slashing, but I wonder if he didn't apply magic to his sword, would that count as blunt damage?
Anyway, another chapter offering no clue what happened between Lena and Yuki.