Yes Prot. from magic weapons does stop u getting intelli drained.... but one of my FAVOURITE tactics vs. the Flayers and ulitarid is Summoning a pit fiend to block the door.... and arrow bombardment from behind... the pit fiend gets Stunned but luckily he doesnt get intelli drained... so you have protection from the buggers in the room while u peg them off nice and easy
Also the Mind Flayers in Athkatla can be easily killed by a cloudkill filled spell trigger into the room then slamming the door shut so they all die in there while trying to get too you [img]graemlins/biglaugh.gif[/img]