Beat the boss counter to my play style.

So, I finally made it to floor 40 worth a solid character. Maxed out vorpal blade with a duplicate; the whole shebang. Engage the final boss and can't hit it while it chunks my health away. Spent the whole dungeon fighting with longswords with 24 dex. Pondering how I can hurt the boss, I notice my evocation was at skilled. Guess it got bumped up from a couple lucky training scrolls since I never used offense magic. Beat the boss by slinging acid at it and escaped. Been playing Nethack on and off for 15 years. Not sure if Pathos counts as a legit win, but it still feels good to finally beat it. Anyone else have stories about winning a hard fight counter to your build?