All I have to say is Legend of Legaia....the Delilias.
Yeah, generally past the halfway point most bosses could combo one character on your team for an instant kill, but something about the delilias always made the game seem unfair, forcing you to overlevel for that extra hp boost.
Hahaha, the Delilas Family boss fight was great in the sense that you have that gimmick where your party is separated fighting 3 1vs1 battles after going through three separate tunnels filled with obstacles, and then having to defeat Koru in 4 turns otherwise you'd be insta-killed.
Let me guess, it was Che Delilas that ticked you off, right? Mostly because Gala sucked giant amounts of butt for the majority of the game compared to Vahn and Noa and Che's attacks hit the hardest. It was also irritating that they teased you with a save point but wouldn't let you save until you beat the Delilases, meaning through the tunnels you go if you lose at any point. Eesh, I can hear it now "GORGEOUS MEGATON PRESS! WHOAH....CLEAR!"