All characters are base level! No XP in weapons, attributes, or magic. The 4th character comes already leveled up as you don't get them until the end of the game. Consequently, they become the tank/damage dealer, and the other characters are buffers.
The basic strategy is to boost intelligence of 4th slot and drain the MP as fast as possible. Four Osmose tomes will drain all MP. I unfortunately got hit with curse, so I couldn't drain MP fast enough and got hit by Starfall.
Once MP is drain, you should Haste and Berserk 4th character. Then, spam Blink. Keeping other people awake in case of lucky hit. That's it.
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