Hmmm... well, theres the cheap method of nailing him with a finger of death, but that kind of steals the satisfaction of winning the fight.
Here's what I'd do. Use the bard's anti-fear song to keep your guys fighting as long as possible, and summon up as much fodder as possible. Be sure to prebuff with spells like haste. During the fight, wack away with your melee guys, and have your mages (if they can, I don't remember) use Mordenkainan's Sword on the gaurdian. If they don't have that, use direct damage spells such as flame arrow.
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