The one where the party forgets to stay together.
Turns out the party had traveled into the lich’s tower on the plane of fire and were trapped and dying of dehydration. The lich Altree Graetus had been surveilling the parties’ progress, and was very amused that the two short swords that were stolen by the battle-cautious halfling were Cursed Berserking Swords. The party decided to bargain for their lives, and Mr. White the gnome proposed that the party would recover the final key to the tower and return it to the lich. The lich graciously acquiesced to the parties request with the small caveat that the party submit to a Geas spell. The party will have to return the key to the tower or report back to the lich within 30 days or the ill-effects of the spell will begin.
With the clock now ticking, the party fled the tower and went straight to the boat. The undead bat was released from its cage, and the party had only to wait until it reached the Horned one. The bat was to be used by the orcs who were digging at the villa as a signal for the horned one that they had found the hidden keep. The horned one was sure to return soon. And the party would let him simply pass by into the keep with the key, thereby fulfilling the geas, and the party could return to town and collect the original prize from the half elf wizard and be on with their lives.
Well, surprisingly enough, there was a wrinkle in the plan. The two dwarves seemed to remember that there were two gems in the eyes of the falcon atop the tower (opposite the tilted bridge), and decided to retrieve them. That went well enough, so the dwarves decided to see if there was a way to retrieve the paladin’s maul which was lost when the bridge tilted. They descended the stairs where they had battled the demon days before, and found some strange porthole-like stones in the wall in the tower at what they estimated to be the tower level. They spent several hours chipping away at the stone with chisels.
At that point the sound of oars in water were heard from the party in the villa above. It appeared that the horned one was here! Instead of forsaking their dwarves to their well-deserved fate, the entire party went below and warned them. By the time the dwarves made it up to the Iron Worm Chamber, the horned-ones party had landed and had discovered the secret passage into the dungeon. Quickly the party decided to cast Rope Trick and hide most of the characters in the interdimensional space created by that spell, and the two mages would cast Invisibility on themselves. Roger the halfling begged to be tied up so that the beserker rage brought on by the cursed swords would not get him killed, but the party decided that would not be a good idea because the spell would expire and he would be killed falling 20 feet. “Besides,” said Brecon, “you do have two magic swords, and we need the help; you’ll be fine..”
Soon, six enormous Ogre Zombies, four “super” skeletons, the Horned one, and one additional zombie, which turned out to be the former party member, Malik, who died at Ogre Jima, but whom the Horned one re-animated for his own vile purposes.
The session ended after it was apparent that the invisible mage Tez was eventualy going to be found by the undead to the undead, and he decided the jig was up, and became visible and tried to convince the Horned One to proceed through the chamber to the Lich’s Tower.