A One-Round Living Greyhawk Geoff Regional Delve Mini-Module
From the introduction:
The enormous castle floats ominously above the combined forces of Gyruff. As has happened so often in this conflict, the might of the Gyric wolfpack is used to infiltrate this fortress. What wonders does it hold? Whom does it hold? Can this behemoth be stopped before it lays waste to the armies and Hochoch?