Xynkil's Vault

Publisher's blurb: This adventure is designed for a party of 11th to 12th level characters. It is set in the Forgotten Realms. In the depths of the Underdark, the beholder Xynkil patiently guards its precious treasure, waiting to destroy anyone foolish enough to try and steal it. This is the eighth and final adventure in the Seldom Spring series. It can be played independently or as part of that series.