I made it to the fairy fight. A lone character, having to keep another character alive, because that character tells you which of the 4 enemies isn't the four fairies to hit. Still a one in three chance to hit. If there's a pattern, I haven't figured it out after an hour of boss fight. Since I'm forced to keep someone alive, I went with the parametic. However, for a lot of it, I'm still stuck wasting a turn, having to take 4 enemy attacks. Hoping I don't have misfortune. I assume that means I hit the wrong one, even if I did damage? On top of that, I still have the typical chance to miss.
Edit: Found the trick to beating that boss. Just attack a single fairy, no matter how much you hit or miss.