A One-Round Living Greyhawk Veluna Regional Adventure
From the introduction:
You received a message to meet Sheen Kriha in the Museum of Mitrik. The message said it was urgent that you report at once as you were recommended for a mission of the utmost importance in this time of need. With the armies of The One encamped around Mitrik what on earth could be important enough to draw you away from the defense of the walls?