artifice guard dialog

i forgot to do this when i saw it and now i can't get back to get the location, but the guard at the door to the other halls, after the first three, says

Alley Oop: deeper
Artifice Guard: Beyond the golden door likes some more of what we have to offer. We do ask that you at least sample the other pleasures we have here first, but many find their desires require more careful attention. Simply collect a key from each of the outer halls, and you will be able to proceed.

 

Thanks, got it