Its easy, first send your cleric invisible, cast blade barrier and send it near them, but dont attack simply looks blade barrier damaging them, when blade barrier ends retire cleric and use your thief, hide in shadows and put him/her near door so you can close when you want, then use your mage and cast a poison cloud that fills the area near door and run for safety, when you see message "mindflayer attacks mage" close door with thief and look those dumbs poisoned to dead, the last step choose your best warrior, give him haste, heroic potions inmunity to psionics, etc and give a merciless kill, at this time the only survive must be near dead
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