A One-Round Living Greyhawk Perrenland Regional Adventure
From the introduction:
Events in the ruins at Kir-Rüss included some damage to the citadel. In the rubble, a hitherto unknown passage was found, leading to a sunken city below. The archaeologists want to check it out, and perhaps it holds the key to the defeat of Perrenland's enemies, but first it must be made safe. Are you up for the task?
Set around Harvester - Patchwall 595 CY.
For characters levels 3–13.
The adventure was distributed as two PDF documents - the 28-page adventure and a 7-page "Appendix" of maps and player handouts.