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and the barbarian can have a spell which drives them away... YAY good ideas.
Actualy, that spell would hardly ever be used, unless you like the idea of surrounding the entire party in low-damage-high-health enemies near a town.
Basicaly, people really dislike when they're trying to get some exp, and the enemies run away. I know this from personal experience and watching others.
Alright, for a Barbarian spell you could have a jumping-attack or charging-attack or something, which would randomly select a target(or you could have it be selected with a Scourge or something).
It moveds all the enemies that are within 1 square of the hit-location, and then moves the Barbarian there, replaces the moved units, and creates a blind Wraith there.
Or a spell for, I dunno, best would be the thief, assuming you'll use Phoenix Soul's idea.
It would create a blinded Scourge or something that can only move within a set of locations around the thief that represent a circle, and when the spell is casted again, it creates a Lurker which attacks to where the Scourge was, along with moving the Thief there.
I'm not sure how you would have the Lurker attack that specific target, seeing as you only have 2 computers, but I'm sure it's possible.