I recently got to the end part of Planescape (after long frustrating hours and some cheating..heheh) to only find out I can go no further becuase of my lack of intellegence????? In the area where there are 3 of the Nameless one's no matter what I do, the game ends and says you cannot continue.blah blah blah... So I snooped around for some cheats and it said that to continue I to control the mind of one of the other Nameless one's I would have to have an intellegence of 21? Is this true...I got so pissed off I uninstalled the game from my PC...(Although I do want to see what happens at the end....) I've played BG, Icewind, starting BG2 and I've never been so frustrated!! Oh well I guess that's why they are RPG's they make you use your BRAIN.....

As far as I remember, having the intelligence that high only allows you to consume the other incarnations, but that's just one option.
You can always kill the crazy one, merge with the good one and work things out with the practical one.
Anyway, after you merge with the good one all your stats go up a few levels. (After you use the sphere).
In the worst case, you can always hack your intelligence and set it to 21, but I seriously doubt that you MUST have it that high to finish the game.

Check the editors on the site if you decide to hack it, or the bunch of walkthroughs and guides that probably contain the info you need as well.

You know where to look... http://www.sorcerers.net/Games/Torment