And if the good advice given above helps, try the improved Mind Flayers from Tactics mod. Mind Flayers are supposed to be one of the most dangerous species in Faerun and with Tactics they surely are. They become a REAL pain in the a..

If you can summon a few skeletons (via Animate Dead) that will also help as they are immune to psionics.

korgan works pretty well for me. just bersek him and send him first, so the other party members dun get the first wave of psionic blasts. then u can send them in wif ranged weapons. jus note that the mind flayers automatically go for those who have been hit wif psionic blasts so perhaps you can use ur party members to block or get rid of those attacking the stunned guys first, or they might get KOed

Mordy swords.

Or you can allways cast polymorph on yourself, change in to a mind flayer and kill your kind muahahahahaha [img]graemlins/evillaughter2.gif[/img] ...