Oh, so there's not an even harder mode to be unlocked when finishing Nightmare? Thank God!
Well, I guess if I beat Nightmare, then that should be doable too. Of course the Health Catalyst is incredibly helpful cause I heal 25HP after each battle instead of just 5. But with that I still don't need a whole lot of restoratives. Playing without that reward would mean more running back and forth for food. And of course playing with the original party, but that wouldn't make much difference. The original party is not better or worse than using any of the unlocked characters.
I'm now playing with Erin, Saehral, Peeboo and MEGAPIUUUUUUUU. But I'm missing Athena and Clochette is quite cool too.
@Tomas - I personally would never do that. I know, I'm a coward. But then the game would certainly not be enjoyable for me.