How can i open the door in the Mind flayer jail???? i have rescued the slaves, but i cant open the door that says i need some "great power or big mind" any help would be great

Spoilish...
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In the room with the slaves, click on the gizmo all the way to the east in that room to make mind control collars (make yourself a few). Put one in a quick slot then use it on a mind flayer. It'll dire charm the target. Lead the victem up to the door, and he'll open it for you (and then attack). The room all the way east of the arena spawns mind flayers, so there will always be a convenient victem.

They slayer also has the power to open the door.

I have released the slaves & charmed the flayer in the Gladiator Pit area but he doesn't see- & can't pass thru- either the magic door or the western door in the same room. (I chose ALL & tried to pass thru either door but the flayer can't pass thru, either).

Uh, yeah. Well, the best thing to do is free the slaves with the goop, grab the headbands and go back to the goop room. A mind flayer will respawn there (just so you can open the doors). Put the headband on it, take it out to the room with the doors, and they'll open automatically. Alternatively you could stop mucking about and turn into the Slayer.