It is very important who talks to Lonk. Because when you open the door (or you come to that area down the stairs) he talks to you immediately. So check on your character portaits who is he really talking to ! You can see a small pink sign on the char.
I'm not sure about INT but CHA always worked for me. Just get the char with 18 CHA to talk to Lonk. You have a second or two to move that char close to the door and others away.
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I grow tired of shouting battle cries when fighting this mage. Boo will finish his eyeballs once and for all, so he does not rise again. Evil, meet my sword! SWORD, MEET EVIL!<br />- Minsc
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