A One-Round Living Greyhawk Highfolk Regional Adventure
From the introduction:
Elves can be a very secretive race of beings. Their haughty aloofness is renowned across the Flanaess, but no one can say it is unearned. Time and time again, the elves of Oerth have proven their skill on the diplomatic, warfare, and artistic fronts. Occasionally, such resourcefulness comes from the darkest places of the world. Yes, even the elves of the Vesve have secrets.
A dungeon-based adventure for PCs APL 8-12.
An adventure tangentially related to the House Divided series.