Scribe Marcus Vale documents the horrifying truth behind "Project: Beneath the Divide," a pre-war initiative designed to adapt humans for underground survival that instead birthed the subterranean monsters known as Tunnelers. As he compiles scattered logs, Vale reveals that these creatures are not just predators but an ecological cataclysm capable of collapsing the Mojave from below. The story serves as a grim warning of scientific hubris, presenting a looming threat that could render the surface world uninhabitable regardless of who wins the war above.

Vault 117 faces a catastrophic water failure, forcing the Overseer to break centuries of protocol and send a young dweller named Alex to the surface for vital repair parts. Emerging from his sheltered life, Alex encounters a wasteland dominated by "The Unity," a regime that enforces a suffocating, absolute peace upon its subjects. Caught between the safety of his home and the dangerous allure of true freedom, Alex is thrust into a conflict that challenges the very meaning of survival and choice in a broken world.

Mercer, a former mercenary, finds redemption as a Railroad agent, trading the simplicity of violence for the burden of saving synth lives in the shadows. His existence is defined by paranoia until a mission to guide a synth named Echo to freedom helps him understand the true value of his sacrifice. Years later, Mercer retires to rebuild the town of Salem, transforming from a ghost of the underground into a pillar of a thriving community. He ends his days not as a spy, but as a builder, finding peace in the "sound" of a life lived for others.

Scribe Tacitus of the Followers of the Apocalypse documents the Mojave five years after the Courier’s victory, revealing a fractured world where favored settlements thrive while the rest collapse into anarchy under a system of selective feudalism. The defeated NCR views the Courier with bitter regret, the broken Legion worships him as a technological demon, and the Brotherhood fears him as an existential threat. Tacitus confronts the Courier in the Lucky 38, discovering a disillusioned caretaker who has rejected all ideologies to simply manage the wasteland's ruin rather than rebuild it. The story concludes with the realization that the Courier has frozen the Mojave in a state of perpetual, indifferent struggle, proving that true peace may be impossible.

Overboss Colter rules Nuka-World in a state of bored invincibility inside his electrified power armor until his lieutenant Gage betrays him. A Vault Dweller challenges him not with a weapon, but with a squirt gun that short-circuits his suit, stripping away his power and leaving him paralyzed with fear. As the raider gangs turn on him, Colter realizes his "godhood" was a hollow cage just before the challenger executes him with a shotgun. His consciousness remains trapped in the dead suit, doomed to endlessly relive the humiliating moment his arrogance led to his destruction.

Arcade Gannon leaves the Followers of the Apocalypse to guide the Courier, hoping to use their power for good, but quickly discovers he is following a terrifying entity governed by video game logic rather than reality. He watches in horror as the Courier heals broken bones instantly by eating raw potatoes, stands motionless for hours to reset vendor inventories, and manipulates faction leaders while wearing ridiculous stat-boosting lingerie. As the Courier conquers the Mojave through absurd "speech checks" and hoarding useless collectibles like snow globes, Arcade realizes he is merely an NPC in a player's world. Ultimately broken, Arcade resigns himself to being a silent witness, waiting for the "player" to inevitably reboot the world for a new playthrough.

Facing imminent collapse in the Mojave, the Brotherhood of Steel allies with Mister House, trading their autonomy for technological revitalization and survival. This "Steel Strip" alliance creates a formidable military force that crushes local threats, humiliates the NCR at Hoover Dam, and establishes a hyper-efficient, corporate police state in New Vegas. Over time, the Brotherhood's culture erodes into mere corporate enforcement, sparking a secret "Codex Revival" rebellion led by disillusioned traditionalists. The story concludes with the Mojave poised for a brutal civil war between House's soulless order and the Brotherhood's resurrected ideology, while the vengeful NCR watches from the shadows.

Following the collapse of the Iron Pact, President Serena merges her consciousness with the bio-mechanical "Unmaker" hive mind, forcing the NCR to launch a desperate offensive into the ruined east. The Republic utilizes the ancient ARCHIMEDES II orbital laser to halt the alien invasion before special forces infiltrate Serena's fortress at Cheyenne Mountain and incinerate her. Though victorious, the NCR transforms into a grim authoritarian garrison state to maintain control over the traumatized continent. The story concludes with a new existential threat looming as the warlord Ghor engineers a self-replicating "Super-Mutant Hive" to challenge humanity's dominance.

Facing extinction from a robotic swarm known as the Scourge, the Brotherhood of Steel and Enclave merge to form the totalitarian "Iron Pact," sacrificing technology to survive. They establish a "Benevolent Tyranny" that ruthlessly oppresses the wasteland and crushes the "Wasteland Liberation Front" rebellion using genetically engineered horrors called Purifiers. Decades later, internal strife over a mind-control virus and the return of an evolved, bio-mechanical Scourge shatter the regime. The story ends in apocalyptic chaos, with the Pact collapsing into civil war while the NCR scrambles to contain the spreading madness.

Ranger Karlekan, an NCR soldier prepared to die at Quarry Junction, witnesses a Courier tame an Alpha Deathclaw not with violence, but by naming it "Mr. Snuggles" and giving it belly rubs. This absurd act shatters Karlekan's worldview, proving that the wasteland's brutal "rules" of kill-or-be-killed are merely a choice rather than a law of nature. Unable to reconcile this new reality with his soldier's life, he deserts the NCR to become a wandering "archaeologist of the absurd," collecting stories of impossible grace. He spends his remaining days as a hermit, guarding the memory that the world can be reshaped by gentleness instead of fear. Ultimately, Karlekan finds peace in the realization that everyone has the choice to break the cycle of violence and live in a new story.