In the mysterious continent of Xendrick, the adventuring party came across a very old abandoned tower. The only way into the tower was a long sloping tunnel that turned out to be trapped and filled with a deadly poison and the numerous corpses of the previous adventuring parties. Of course, if you are a D & D adventurer, such a tunnel is not going to scare you off. It is going to irresistibly pull you in.
After nearly dying on three different attempts to get through the tunnel, Gandy Rumspot, the halfling rogue and thief, realized that it was a poison gas in the tunnel. So he sent Big Cogwheel, the warforged artificial man who didn’t need to actually breathe air, to use his natural immunity to poison to go down and open the tricky invisible door and gain access to the tower.
Voila! On to further tricks and traps. At one point, exploding skeleton warriors animated by necromantic trap spells nearly killed Cog the warforged (by rolling a twenty on an attack roll) and required a miraculous magical repair by Gandy to save him. That left the big metal man with a permanent irrational fear of skeletons.
Along the way, they encountered and had to overcome a bound female demon who had been imprisoned in the tower to keep watch over the property. She was the slave of the Wizard Crane, builder of the tower long ago, who had then gone abroad and died in his semi-noble quest to slay a devil. She told the adventurers a great deal about her former master and her imprisonment, monologuing as villains will before killing and eating the adventurers. She overdid it, though, accidentally revealing the presence in the room of the devil jar that enslaved her, and even more stupidly, revealing how to activate the jar to physically seal her inside like a genii in a lamp.
Finally, they found the teleport room in the top of the tower which zapped them to the dungeon under the earth where Crane’s ultimate treasure was kept. It turned out to be a crystal ball which contained all the knowledge, memories, and experiences of Crane himself. In fact, Crane’s entire life up to the point where he left on his fatal adventure took the form of Crane’s imprisoned self, longing to have someone to talk to again after hundreds of years of loneliness. This proved to be a great boon to the magic users in the party, especially the half-elven wizardess Drualia. So that adventure left the adventuring team with more than a mere heap of experience points. It also gained them a crystal ball with an imprisoned sorcerer in it to talk too much and complain too much and teach them exotic and dangerous magic spells.
Like any three-session D & D adventure, this one was probably a lot more entertaining to play than it was to retell, but there it is, complete with the secrets that kept my players thinking about them for more than three weeks.