Last night I had trouble escaping Illithid city. It must be obvious, because I couldn't find any previous posts on this topic. I got one of the warded doors by collaring a mind flayer, but can't seem to open the other warded door. How do they escape???

BTW those monks slice through mind flayers like butter. Didn't even need that anti-psyonic potion.

If you have any of those mind controlling circlets left wait for a mind flayer to respawn out of a room off to the upper right from the central circular room. I know it's vague, but it was a long time ago...:P
There's another door to be opened that leads to the Great Brain or something look in West side of the "city" for any hidden doors you might have missed. If you have no circlets left I used the staff of mind control that you find in the city. It works on Illithids and Flayers almost every time!

Good luck!
oSo

Great suggestions given already in the above post. Other than mind controlling options there is the other option. That 'option' is stated in the floating text when you get to certain doors.." This door can only be opened by a powerful mind OR GODLY STRENGTH". In other words, it could be SLAYER time... 25 Strength.

Additionally one of the rooms 'respawns' an Illithid every so often that you can collar and mind control. That is if you've 'done the deed of exterminating' all the bad guys in the area already.