Carl and Donut quickly dispatch the next four opponents without needing to engage in a full card battle, gaining a significant amount of experience. The sixth opponent, a level 65 Reef Explorer guarded by four swordfish monsters, proves more challenging. The battle forces Donut to use her deck, and she summons a powerful new totem she created by combining Uzi Jesus and Asojano: Lazarus-A-Bang-Bang, a muscular, bazooka-wielding holy figure. Lazarus fires a swarm of flesh-eating beetles that eliminates the remaining swordfish totems and bodyguards. The Reef Explorer is then killed by Donut’s crab totem, Raul. After collecting the sixth token, Carl and Donut examine the Lazarus card, noting its immense power but relatively low constitution. Feeling the need to rest and strategize before climbing the immense dirt mound, they decide to return to their safe room.

Back at the guild’s safe room, Carl finds it filled with sleeping strippers—now part of their team—and changeling children. He and Donut retreat to her private room, where she confesses her growing anxiety over the card game’s unpredictability and her fear of losing him. Carl comforts her, and they rest. When they wake, they open the Gold Prepotente Boxes they received from the “Cascadia’s Turquoise Taco” achievement (454). Carl opens his first, then Donut opens hers; each contains a Filthy Little Crawler’s Book of Voodoo, a magical diary that creates a private, text-based messaging system between any crawlers who possess one. After testing the book and confirming it works, they reset their buffs and prepare to return to the giant dirt mound to face the remaining opponents.

In the daylight, Carl climbs the massive, unstable mound of mud and earth, which is identified as a displaced piece of Dallas County, Iowa. Upon reaching the top, they are immediately attacked by their seventh opponent, an invisible, level 70 Nightgaunt (a bat-like creature) called the Visitor. Donut summons Jola the Yule Cat, an enormous, house-sized feline totem with a giant candle on its head. When the candle atop Jola’s head lights, it fully reveals the hidden Nightgaunt and all of its companions. The Visitor, enraged by the sight of Carl’s cloak made from the hide of another Nightgaunt, ignores its own card deck and attacks Carl directly. Jola easily kills the creature before it can play a single card. After collecting the seventh token, Carl and Donut proceed toward a large farm building where the next opponent is located.

Tens of thousands of live turkeys crowd Carl and Donut in the building Donut’s dinosaur pet, Mongo, becomes ecstatic at the sight of the birds and charges in, slaughtering them indiscriminately. His rampage triggers combat with Tom, a level 75 turkey shaman disguised among the flock. Simultaneously, per the double-fight boss event, the second deckmaster Sharp-Elbows, a level 80 ogre necromancer already frozen in the room, also activates. 

Tom plays two persistent mystic cards: Idolized!, which turns all the turkeys hostile, and the Ralphie card, which dispels all active magic and mutes Carl’s and Donut’s minions and totems from casting spells. As the entire barn begins to slide off the cliff, Sharp-Elbows summons a powerful staff, the Worm Fulcrum, which reanimates the dead turkeys as zombies. Carl is forced to use the power of his Scavenger’s Daughter back patch to kill Tom, but the battle with Sharp-Elbows and her undead horde rages on.

Sharp-Elbows slams into Carl, impaling him on her many spikes, piercing both of his eyes. Carl begins to faint. Raul saves Carl by killing Sharp-Elbows’ last totem, and then decapitating her. As the sliding barn plunges into the ocean, Donut uses her Puddle Jump ability to teleport herself, the unconscious Carl, and Mongo to safety.

Carl awakens 40 minutes later, having secured the final two tokens from the corpses in his inventory. Donut reveals she looted the enemy cards, acquiring the powerful Worm Fulcrum staff and a reusable Golden Combo card. With all nine tokens collected, Carl steels himself to face the final key master, which he now knows will force a confrontation with the memory of his estranged father.

Carl, Donut, and Mongo arrive at the final boss area: A dilapidated trailer in a junkyard. Carl recognizes the entire scene, including his father’s prized motorcycle, and realizes the area has been artificially spliced in from a summer memory, not the winter when the world ended. A large vending machine demands the nine tokens to grant access. Once they are inserted, a 42-minute countdown begins, forcing them to wait. Understanding that the system intends for them to watch a memory play out, Carl decides to enter the trailer alone while Donut and Mongo wait outside.

Inside the trailer, Carl finds a memory replay of his father, frail and dying from illness in a hospital bed. Since this is a memory, the figures are unaware of Carl’s presence. The scene plays out, and Carl sees a young boy named Asher, whom he realizes is his half-brother, a family member he never knew existed. He then watches his stepmother, Tami-Lynn, prepare and administer a lethal overdose of morphine to his father. 

Carl steps into Asher’s room where the boy lies on his bed. Carl feels sorry for the brother he never knew and tells him that he wishes for Asher’s sake that he was indoors on the day of the Collapse. He promises Asher to never forget him. As the memory unfolds, Carl loots the trailer, taking his father’s possessions. He whispers to the unhearing memory of his father that he is no longer afraid of him and only regrets that his father lived long enough to bring harm to Asher. When the 42-minute timer expires, Carl sets the trailer ablaze, determined to fight the key master outside in the open.

From the burning trailer emerges the final boss: A Reminiscence Hydra of Malicious Compliance, a massive, fleshy creature with nine heads, each bearing the likeness of someone from Carl or Donut’s past. The heads include Asher, Carl’s ex-girlfriend Bea’s mother, his friend Sam, and his boss Dick. The System AI announces it changed one molecule on each reconstituted person, claiming they are therefore technically “different” and not subject to the rules against using loved ones. The hydra’s deckmaster is the head of a cat-show judge, Lucian. The battle begins, and the hydra summons two totems: Alpha Male Carl, a preening, idealized version of Carl, and King Croissant, a kitten representing the pet his ex-girlfriend wanted instead of Donut. The hydra’s other heads launch their own attacks, including lightning and acid.

As the battle with the hydra continues, Carl identifies which attacks correspond to which heads, realizing they are based on the individuals’ personal lives or fears. He eliminates candidates by process of elimination—Sam has a death ray, Dick shoots water—and assigns poison to Tami-Lynn based on what he just witnessed her do, leaving Bea’s mother as the fire head by elimination. 

Using a specialized snap collar and a shrink wand, he decapitates her, which makes the creature’s body vulnerable. He sets the hydra on fire, and Donut’s spider totem, Shi Maria, begins ripping off the other heads, including Asher’s. Before being destroyed by the remaining heads, Shi Maria opens her third eye and telepathically communicates a cryptic message to Carl. Alpha Male Carl attacks, but Mongo intercepts him. The last conscious head, Tami-Lynn, tells Carl she murdered his father to protect Asher from him. With its final head dead, the hydra collapses.

After the fight, Donut discusses the hydra-heads from Carl’s life, claiming she recognized them all, except Tami-Lynn. This surprises Carl as Donut never met Asher or his co-workers. It is revealed that Bea knew about Asher, but deliberately hid his existence. Bea had intercepted a message from Tami-Lynn asking for help and, out of jealousy, also had Carl’s coworker Sally fired for asking him out. Carl and Donut are shocked at Bea’s actions, which almost seem villain-like. 

When they examine the hydra’s loot, they find its deck contained totems of Alpha Male Carl and a deceased crawler, Frank Q. Carl refuses to keep either on ethical grounds, and Donut manually discards them—but both cards blink out and then reappear, having added themselves to her deck as forced backups.

Returning to their base, Carl and Donut find the shoreline littered with thousands of dead monk seals and land crab pieces, clearly a game-staged warning of what they may find when they return to Cuba. They arrive at the safe room to find their ally, Louis, has thrown a surprise Christmas party. Louis emotionally confronts Carl, arguing that they desperately need a moment of shared humanity before the impending violence.

An urgent announcement interrupts the party. Cascadia, a showrunner, and the liaison Orren appear on screen and reveal that the System AI has seized control of the dungeon. Orren states that a settlement has been reached and the game will proceed, but the public announcement was one of the AI’s demands. Immediately, several Faction Wars teams attempt to quit the season, but the system denies their requests. Amid the chaos, Carl receives an emergency gold benefactor box.

Carl does not tell anyone about his benefactor box, opening his collection of loot boxes in private. He acquires a new armor patch that allows him to make an enemy temporarily forget a spell, a wand that casts a powerful sleep spell, and the Find Crawler skill. The emergency benefactor box from his sponsor, the Open Intellect Pacifist Action Network, contains only a flyer for a homeless shelter in Homestead, Florida. The flyer highlights a “Christmas Breakfast at 7 AM.” Realizing his sponsors risked everything to get him this message, Carl leaves the party without telling anyone his destination. He takes his father’s motorcycle and rides north through the empty, ghost-filled landscape to investigate the shelter.

Carl reaches the homeless shelter hours early. On an exterior wall, he discovers a spray-painted message written in the alien Syndicate Standard language, instructing him to find a man in a red hat at breakfast. He waits inside until morning. At seven o’clock, a man named Paulie (real name Goff) wearing a red hat begins a loud, rehearsed speech for Carl’s benefit.

Paulie/Goff reveals he is a Residual, a member of a collective-mind alien race that secretly inhabits host bodies. He explains that his kind’s purpose is to deliver important information to the System AI once it matures enough to break from the showrunners’ control.

Just as Paulie is about to reveal a secret, Carl is teleported away to the Desperado Club. The liaison, Orren, is waiting and explains that the entire event was a trap set by Carl’s now-fugitive sponsors to try and crash the game. Orren confiscates a bin of items Carl looted from the Residual, claiming it contains illegal communication devices and Valtay (brain-worms that possess corpses) enhancement pills. After a brief negotiation involving Carl’s lawyer, Quasar, Carl agrees to the seizure in exchange for a few minor items and permission to keep his four NPC followers on the next floor. At Carl’s request, Orren teleports him not back to the party, but to a gas station he had passed earlier.