The Gates of Firestorm Peak[/b] was an adventure by Bruce Cordell meant to showcase the 2nd edition AD&D Player's Option Rules. It also introduced the Far Realm and many of its creatures. In addition, duergar were somehow involved.
Here's a review.
Some say the glass is half full, some say half empty. I say .... who cares it will be mine in a minute.
— yugoloth realist