The Gate of the Feral Gods

The Gate of the Feral Gods isn't a faction — it's a legendary-tier artifact Carl comes across on the fifth floor: a device that tears a doorway through the void between worlds to link two distant locations. Using it has a cost. When the portal closes, an ancient, maddened deity is loosed into the world on the side it opened from.

At around 600 pages in hardcover, it was the longest entry in the series at the time it published — driven by the fifth floor's "Bubble" challenge, which splits the crawlers across four castles that all have to fall before the stairwell opens.

Yes. The series never lets the group settle into a stable configuration. New companions join, old ones leave or die, and Carl's social orbit shifts with each floor.

No. The series is too serialized for this to work as a starting point. Read from book one.

Significantly. Book four is where the dungeon's underlying machinery — who runs it, why it exists, and what it costs — starts to come into focus in ways that change how Carl approaches the game.

Roughly similar energy, but with more political complexity. The humor is still present but the stakes escalate considerably in the second half.