The Dungeon Anarchist's Cookbook

Carl, Princess Donut, Katia Grim, Mongo, and Mordecai arrive on the fourth floor, the Iron Tangle, inside a moving subway train. They quickly learn that the floor is a giant rail network where trains, transfer stations, and maps matter more than open exploration. Donut is forced to choose a new class and becomes a Hooligan, gaining the party-support skill Mascot. After surviving a monster swarm by turning Carl's Protective Shell into a stationary wall that the moving train smashes enemies into, the group reaches transfer station 83. There they discover that crawler numbers have collapsed badly, receive unusually strong compensation loot, and combine their personal-space coupons into an advanced shared home with training, crafting, and recovery upgrades. The new base becomes a major long-term advantage, but Carl's mood darkens when he reads Brandon's final message, sent as Brandon died holding off monsters so others could escape.

The team settles into training, mapping, and resource gathering while Mordecai studies the floor. Carl starts crafting, trades books with Limp Richard, and tests fighting formations inside train cars. On the Yellow Line, the party meets Vernon, a drunken dwarf conductor whose employee-only car is protected from monsters. Vernon explains crucial rules: the line seems to reset after station 435, the train's contents reset but items carried on a person can persist, monsters board in patterns, and the full route takes days. Carl thinks Vernon may be the key to understanding the floor, but a trapped reward suitcase unleashes fire ants, destroys the conductor's car, and kills Vernon. Forced off at station 116, the group explores the station instead of simply fleeing. They build resistance to the nausea caused by Red Cornets, discover showrunner control sigils and dormant dwarven robots, salvage large amounts of metal and batteries, and learn from Bautista that Imani is alive and wants to meet.

At station 131, the party upgrades again. Mongo reaches level 15 and gains a new attack, Mordecai improves the alchemy setup, and Donut receives a saddle that would let her ride Mongo if she can learn to use it. Carl's Platinum fan box turns disastrous when a Prize Carousel hosted by Chaco appears in the saferoom. Mordecai recognizes Chaco, attacks him, and is suspended for seven days. With no guidance, Carl chooses a strange prize: The Dungeon Anarchist's Cookbook. Once Chaco leaves, Carl discovers the book is a hidden inherited manual for sabotaging the dungeon, invisible to viewers and administrators. He must keep it secret and make any breakthroughs look like his own work. Soon after, Carl and Donut meet Elle and Imani at the Desperado Club. Imani explains that Brandon died after splitting from Chris, who has changed badly and is now looking for Carl. During the same visit, Donut is attacked by another crawler and kills him in self-defense, gaining a skull above her name and a set of dangerous PVP coupons she later quietly discards.

Without Mordecai, Carl begins relying more heavily on his own analysis and his growing network of crawlers. He trains, crafts explosives, improves Katia's disguise options, and derails an ochre-line train to capture an engineer. Gore-Gore, the mantaur engineer, reveals the floor's most important secret: ordinary cars are dumped at the end of the line, but an engine car can survive the return route, while an employee portal offers a second, riskier path. After Gore-Gore becomes a neighborhood boss and attacks, Carl kills him by knocking him onto the electrified rail and loots a full Ochre Line map. The team then boards the named train Dismemberment Limited, where Levi the Seventh, a terrified symbiote engineer, becomes the center of a quest. Carl and Donut use Donut's Hole spell in an improvised decapitation trick to kill the war mage Dismember. Later Carl turns scrap and crafting knowledge into a powerful exploit for Katia, building equipment that lets her absorb far more mass and transform into a much heavier combat form.

Carl next hijacks the Nightmare Express in a reckless tunnel ambush. The plan nearly kills him, but his shield attack wipes out most of the train's monsters and crew. Clinging to the engine, he learns the controls from Fire Brandy, a demon stoker living in the boiler, and drives the train himself. At Abyss station 436 he finally understands the Iron Tangle: train cars are discarded into a giant burning pit while engine cars are sent through portals to a zombie-filled trainyard for reuse. His new portal-analysis upgrade lets him inspect these thresholds, and he learns that seemingly useless items such as conductor hats can function as keys. Soon stage-two withdrawal monsters start invading even transit stations that had seemed safe. Passing through Repair Hub E, Carl encounters Festering Ghouls, a gremlin technician named Widget who dies almost immediately, and Madison, an HR worker whose confused memories reveal how fake the workers' supposed home lives are. Madison also explains that Terminus stations are actually station mimics that consume passengers, and later Carl confirms that station 60, advertised as an employee city, is an empty lie.

Other threats close in at the same time. Frank Q., broken and half-finished as a threat, reveals the truth about Yvette's death and gives Carl the cursed Marked for Death ring. Carl learns that Yvette had marked him, which meant she could not heal after being injured, and that Maggie ultimately killed her own daughter to end her suffering. Frank also confirms Maggie may still have a powerful tracking potion. A media appearance follows, where Carl refuses to read an offensively false script about Earth culture, steals useful furniture from the production trailer, and learns that Chris has killed Frank. Then Hekla and Brynhild's Daughters arrive in Carl and Donut's personal space. Hekla asks for help rescuing a thousand trapped crawlers at station 101 and proposes using Katia as the front plow on a reinforced train. Carl distrusts Hekla and Eva, but Katia insists on going because she still feels loyalty to Hekla's team.

The rescue run becomes a nightmare. Katia reshapes herself into a living scoop attached to the train, and the combined group uses her body to smash through ghoul hordes and withdrawal monsters. Carl learns that soul-crystal-powered ghoul generators are producing some of the new horrors. As the train nears station 101, Katia's health falls faster than expected, and Donut finally sees the real cause through her special glasses: Hekla has been hiding assassin bolts inside her ordinary attacks and embedding them in Katia. In the cramped cab afterward, Eva admits Katia was targeted on purpose to provoke Carl into a fight and leave Donut vulnerable to recruitment. Katia, devastated and enraged, uses Rush, misses Eva, and accidentally kills Hekla instead. The death of the number-two crawler shatters Brynhild's Daughters, vaults Katia up in level and notoriety, and forces Carl to take command of the packed train. He reverses it out of station 101, exposes Hekla's plan to Silfa, and hands part of the evacuation effort to Li Jun while he, Donut, and Katia keep trying to save people.

At station 75 the team commits to a larger rescue strategy. Crawlers donate hundreds of portal hats and keys, showing Carl that solidarity still exists despite the floor's attempts to destroy trust. Katia opens powerful rewards, including a crossbow from Hekla and later gifts that improve her crowd-control role. Zev warns that politics may soon remove her as the team's representative. Carl then discovers that Growler Gary, an apparently immortal gnoll bartender, is the key to using rapid-response interdiction carts whose portal scoops can clear entire rail lines. Because the carts require gnoll hands to stay active, Carl repeatedly kills Gary and harvests his left hands until Gary understands the mission and willingly endures the process. With Bautista's help, Carl launches rescue carts toward the isolated groups around the Abyss while also bombing lines and redirecting monster flows. During this phase he learns a horrifying new truth: stage-three withdrawal monsters do not die cleanly but burst into swarms of fast-growing Krakaren larvae.

Carl, Donut, and Katia then ride a cart down the Mindaro line to rescue Bautista's stranded group. On the way Carl accidentally teleports the massive station-433 mimic city boss into trainyard E, turning that route into a death trap. After learning the mimic is too dangerous to fight directly, he switches plans and uses the Abyss portal plus the stockpiled hats to evacuate Bautista's survivors to yard H instead. The operation rescues roughly 1,400 crawlers. When Mordecai finally returns, he apologizes for his suspension-triggering outburst, warns Carl that the Ring of Divine Suffering would make him a prime target on later floors, and helps decode the map. The Iron Tangle, he says, is both a stylized Syndicate logo and anti-Krakaren propaganda. Katia then realizes the stations are paired and partly mirrored, with hidden chambers between levels. Carl concludes that the Krakaren are being set up as the floor's true final disaster.

Acting on that theory, Carl evacuates the stairwell stations and rigs station 36 with a hanging interdiction cart aimed into the Abyss. When the floor timer reaches one day remaining, the Iron Tangle breaks down and full-sized Krakaren erupt upward through the stairwell hubs exactly as he predicted. At station 36, the portal trap works, dumping thousands straight into the pit, but the defenders still have to hold the side passages against juveniles, ghouls, and acid blood. Soul crystals begin exploding elsewhere, confirming Carl's belief that synchronized large kills can overload the system. To exploit that, he retrieves another portal cart, briefly ruins Prepotente's slower plan to kill a province boss, and pushes toward the trainyard. There he tries an even riskier cookbook-inspired idea: use his gauntlet to force a mantaur to summon Grull beside a portal. The move misfires, and Carl is dragged into trainyard E with the mantaur just as Grull arrives.

Trainyard E becomes one of the book's worst crises. Carl is trapped between the Mimic Rex and an invulnerable Grull, now sponsored by Prince Maestro. He survives only through invisibility, smoke, and Mordecai's powerful healing brew while Grull destroys the mimic and nearly crushes him. Refusing his orders to stay away, Donut, Katia, Li Na, Li Jun, Zhang, Elle, and Mongo mount a rescue. They bring a second prepared mantaur, trigger a fresh summoning sequence, and throw the creature through the portal at the exact moment needed to pull Grull away from the trainyard. Afterward Carl positions the Nightmare Express on the employee track and sends it into the Abyss, intending to destroy more generators and soul crystals. Fire Brandy and Tizquick choose to stay aboard and die with the train rather than continue serving the system that trapped them in repeated false lives. The explosion succeeds, Carl gains levels, and the surviving crawlers can finally move toward the open stairwell.

At the threshold of descent, Agatha suddenly reappears and walks down ahead of them. Then the story shifts to a heavily controlled post-floor interview. Zev is gone, replaced by the more censorious Loita, who says Zev has been sent to reeducation after a personal tragedy. During Odette's show, Carl learns his odds in the Grull challenge had been set at fifty to one, evidence of how much Borant expected him to die. Odette clashes openly with Loita's censorship and privately admits she, not her husband, backed Hekla, while nearly revealing something more about Chris before being silenced. Instead of being returned normally, Carl, Donut, and Katia are sent straight into the fifth-floor selection chamber. Donut spins the wheels, and the team draws the Air quadrant and the Dirigible Gnomes, sending them toward a sky-fortress war on the next floor.