[Feagil of the shadow]

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Right I've just finished Durlag's Tower- not too difficult. I've arrived back at Ulgoth's BEard, and killed all Cultists etc except ones in the room with Aet'Letec. And I can't Kill Aet'Letec! I know I have to kill the cultists else he regens, so I've been trying to do that, but he holds my people, makes them panic, and did this funny thing that had a sign saying Dying next to my chars, then they all blew up!! I am despairing here! So far I try to cast summons to keep the demon busy while I try to kill the cultists- but he still hacks my chars to pieces and every summon!
what am I doing so wrong?

My PArty:
Ajantis Level 7
Minsc Level 7
Branwen level 8
Jaheira level 7/8
Thief level 9
Dynaheir levl 8