Vessel was created over 4,000 years ago to be a servant and support for the Chilorans. Today, he is once again fulfilling his directive deep in the vaults—this time for a very different group of people. Vessel will lead these adventurers through the underground labyrinth and warn them of dangers whenever asked. But Vessel will not do any of these things until he is asked—and that tiny detail could be the difference between life and death... especially for a gnome.

We recap the last 5 episodes.  

Driven by a directive given millennia ago, Vessel leads the heroes into a labyrinth full of traps and trials that test their courage, fortitude, and intellect against the riddles of the Ancient Chiloran. But even if they survive the traps, they must still face the Hulking Automatons that await with their own directive: to kill everyone that is not Chiloran.

Galen gets a break in his quest for Vedenite, and the group decides to cross an ocean beneath the mountain to reach it. Zaldor faces reprimand in his role as a Wizard of Selection, and Goli is dragged into an unexpected reunion.

After enduring a brutal aerial onslaught of dragons, the battered Wake limps toward the legendary dwarven city of Shadow Hall. There, Lord Ansgar is hailed as a hero, while Goli faces consequences of choices he made in his previous life.

The Wake and her crew barely escape the Iron Fortress, though the airship is left badly damaged. With no skilled craftsmen in Kanebren to make the magical repairs she needs, the crew sets their course for Shadow Hall, hoping to avoid trouble along the way. Jericho is reunited with a long-lost acquaintance, while Zaldor is confronted by a figure from his past—one who warns that ancient beasts are beginning to rise from their centuries-long slumber.

The Iron Fortress powers on once more. Its systems groan awake waiting for their next command. Corridors glow with a cold light that reveals dangers previously concealed in the darkness. The archives reconnect to their databanks, exhuming secrets that were never meant to be discovered, and many people who thought that they were lost forever are suddenly, and violently, found. 

Jeremy recaps us up to date.  

Hugo holds up his end of the bargain, even as his thirst for revenge against the Guardians burns within him. Room after room unfolds before them, each passage leading deeper into the heart of the decaying ship. At last, they discover the means to awaken the Iron Fortress—and with it, all of its deadly protectors.

Warily following their new guide deeper and deeper into the bowels of the Iron Fortress, the Guardians are forced to confront the horrors of what the Legion has done—and continues to do—to the people of Calaviare.