Not a bad question. Having someone like Mah or yerssot with you would make it easier (Adventurers are very skilled).
Well, if you go to the sort of place where that sort of entracne may be you might have a chance.
Or if you find someone who could tell you.
I could just tell you exactly what to do, of course, but there would be little fun in that.
Lance and Xeth walk around a little longer searching for one of the secret enterances. Lance was about to give up when a thought hit him, ask one of the locals and see if they have seen these huge doors.
So Lance walks across the street and heads for a quaint little pub. He then walks inside and goes straight to the bar. And starts to talk to the bar keep.
"Hello, can you get me a blue ale?"
"The pleasure is all yours," he says.
Now you look at his left arm, Lance (and this is notwithstanding that AOTC might have made it that prosthetics are lousy anyway), it DOES look rather artificial. Larger than it should be. and not quite real. And no hairs on his hand (and preumably on the arm). Unconvincing skin. Not very pretty ay all.
"Not finished your business here yet?"