Pyramid of Light

This adventure was originally designed as an AD&D scenario and run at GenCon XIV Convention. However, due to copyright reasons, it was published in "Adventure Gaming" as a generic adventure, suitable for any fantasy RPG.

Your homeland, the small, but happy and prosperous country of Bel-Vedere, has been attacked by insidious black sorcery. All of the country's wise men and mages have failed to block the attack, which has taken the form of mass confusion, fear, and frightening illusions.
After studying ancient manuscripts, the mages determined that Bel-Vedere's only salvation lay in their obtaining an artifact called the "Pyramid of Light". A plea for adventurers to undertake the quest to locate this artifact was issued, and you ten were chosen from those responding.
A torn parchment, found with the manuscript which told of the Pyramid, bears a map to the temple, which is the legendary home of the artifact. The parchment also contained the enigmatic phrase "Three keys only will open the door to enlightenment".
Equipped by the mages, your party has followed the ancient map for 20 days, through the southern wastelands, stopping at the oases marked. Mid-morning of the 21st day, you come upon a huge, pyramid-shaped structure nestled between sand dunes. Approaching it slowly, your adventure begins...