Like everyone said, a mage with improved invisibility casting ck, deathfog, or a cleric with fire storm, then close the door. I took it a step further and after having the mages cast deathfog, I sent Yoshimo up to set traps, and then hide in shadows, then open the door. The already weakened bastards came out and then died on the traps. I didn't have to touch a single one.
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