A One-Round Living Greyhawk Regional Adventure set in The Kingdom of Nyrond
From the introduction:
In the wild marshland of the Gnatmarsh, dark places become lost, decayed, and forgotten. For resolute treasure hunters and mystery seekers, it’s a nagging call and a ripe lure. One such seeker, Kelwyn, now has mysterious keys that fit a lost door as well as a map to that door. The route leads to a long forgotten temple ruin in the depths of the Gnatmarsh. Legends say only a fool would use the keys to open that dark door. Kelwyn is looking for such fools.
A one-round Regional adventure set in the Kingdom of Nyrond for characters level 1 - 10.