First hit every room with a cloudkill spell to eliminate the Umber Hulks. Then try to get the Mindflyer out into the hallway. Summon Elementals and Skeletons to block the entrance to the room and attack them with ranged weapons. Have allways enough Skeletons at hand.
I was never able to counter the Domination spell by dispel magic, so I just kill all the mindflyer and get away from that chracater until it wears off.
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