Wiz6
I am playing a six magic-users party. To my biggest surprise it was a piece of cake so far. Until the Styx river. Now, Houston we have a problem. But I am a little low-level. I have only a Level 10 party: PRI-PRI-ALC-PSI-MAG-MAG
No wonder you need to drink so much from the fountain with that party.
You'll need a Lord, a Valkyrie and a Samurai to wield the best weapons in the game.