A One-Round Living Greyhawk Pale Regional Adventure
From the introduction:
Winter, CY 595. The war has ended as quickly as it began. The city of Calbut, now annexed into the Theocracy of the Pale, celebrates as operations in its four platinum mines resume. You are contacted by a scholar who has knowledge of an ancient Flan treasure. The trail to the treasure begins where the mines end; in the Underdark.
An adventure for [player characters] who aren't afraid of the dark.
For 4th - 12th level characters.