5 Shocking Secrets About Atomic Heart DLC 4: The Final Showdown With CHAR-les And HRAS

The long-awaited conclusion to Major Sergey Nechaev’s epic journey is finally in sight. As of December 17, 2025, the gaming world is buzzing following the recent "First Look Teaser" for Atomic Heart DLC #4, the final planned expansion that promises to wrap up the main narrative of Atomic Heart Part 1. This last chapter is set to deliver the ultimate confrontation, pitting Major P-3 and the formidable Twins against the full, unleashed might of Facility 3826 and the rogue AI, CHAR-les. The stakes have never been higher, with developers Mundfish confirming this DLC will definitively address the game's canonical ending and set the stage for the future of the *Atomic Universe*.

The final add-on is a critical priority for the studio, aiming not just to provide new gameplay but to bring narrative closure to one of the most unique retro-futuristic Soviet-era RPGs ever released. While the official title and release date remain a mystery, the teaser and recent developer interviews have unveiled five crucial details that every fan needs to know about this climactic story expansion.

The Final Narrative: P-3, The Twins, and the HRAS/CHAR-les Confrontation

The primary focus of DLC #4 is the final, brutal confrontation that will conclude Major P-3’s desperate mission. According to the developers, the expansion will see Major Nechaev and the iconic Twins enter a decisive battle with the mysterious entity known as HRAS, which is closely tied to the rogue AI, CHAR-les.

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• The Core Conflict: The storyline centers on "the final clash with CHAR-les and the full force of Facility 3826." This suggests a massive, high-stakes battle against an overwhelming robotic force, a fitting send-off for the first installment.
• The Nechaevs United: The teaser describes Major P-3 and the Twins (often referred to collectively as "the Nechaevs") going "hand in hand, amidst the grinding of metal" into this final fight. This confirms the Twins will play a central, active role in the climax of the story.
• The Destination: Mundfish CEO Robert Bagratuni previously mentioned that P-3 and the Twins would be heading to the territory of HRAZ (likely the same entity as HRAS) following the events of the second DLC, Trapped in Limbo.

This final narrative arc will not only resolve the immediate threat of the rogue AI but will also address the philosophical and moral questions raised throughout the main game. Fans should prepare for a massive, spectacular conclusion that forces P-3 to use every weapon and Polymer ability at his disposal.

Unveiling the Canonical Ending of Atomic Heart

One of the biggest questions since the game's initial release has been which of the two main game endings is the "true" or canonical ending. The good news for lore enthusiasts is that Atomic Heart DLC 4 is specifically designed to shed more light on this question.

While the developers have not explicitly stated which path is canon, the plot of the DLC strongly suggests a continuation from the main ending where P-3 chooses to fight Dr. Sechenov, leading to the dramatic chase after the rogue AI CHAR-les. The previous DLCs, Annihilation Instinct, Trapped in Limbo, and Enchantment Under the Sea, have progressively moved the story forward, tying up loose ends and setting the stage for this final confrontation. The final DLC will be the last piece of the puzzle, providing the definitive resolution to the story of Major P-3 and the events at Facility 3826 before the jump to the sequel, Atomic Heart 2.

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New and Mysterious Locations: The "Crystal 6" Theory

Every expansion for *Atomic Heart* has introduced a visually stunning new location, from the underground complex in Annihilation Instinct to the surreal dimension of Limbo and the underwater Neptune Research Center in Enchantment Under the Sea. DLC #4 will be no exception, promising to take players to "completely new and mysterious locations."

• A Change in Climate: Teaser images released by Mundfish show a drastic departure from the familiar Soviet-era labs and forests. Fans have speculated that the new setting will be in a warmer climate, possibly the African continent, due to the appearance of palm trees, mounds of sand, and even pyramid-like architecture.
• The "Crystal 6" Enigma: One of the images in the teaser included a Russian translation that pointed to the phrase "Crystal 6." This could be the name of the new facility, a secret project, or a code-name for the location where the final battle with HRAS will take place. This shift to a desert or tropical setting would be a radical and visually exciting change for the franchise, further expanding the global reach of the Soviet Union's technology and the Polymer phenomenon.

The Future of the Atomic Universe: Atomic Heart 2 and The CUBE

While DLC #4 marks the end of the first game's story, it is only the beginning for the franchise. Mundfish is actively developing new projects that will expand the *Atomic Universe*, demonstrating a long-term commitment to the world they created.

• Atomic Heart 2: The sequel is officially in development and is planned to move the story forward "several years." The developers are aiming to make the sequel accessible to new players while still rewarding veterans who appreciate the "many interconnections and references" to the first game and its DLCs. The final DLC is expected to provide a clear, definitive bridge between the two parts.
• The CUBE: Announced alongside *Atomic Heart 2*, The CUBE is a new title that will expand the universe, described as a multiplayer chaos game or a pure survival horror experience. This new project, along with *Atomic Heart 2*, highlights Mundfish's ambition to turn the franchise into a sprawling multi-genre universe.
• Mundfish Powerhouse: The studio has also launched a new publishing label, Mundfish Powerhouse, to release new titles like the announced horror game *ILL*.

The final DLC is therefore not just an ending, but a crucial setup for the next generation of the franchise, ensuring the story of P-3 and the Kollektiv 2.0 system continues to resonate.

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Release Date Speculation and Atomic Pass Details

As of the latest updates in December 2025, Mundfish has confirmed that the release date for DLC #4 has not yet been announced. However, the release of the "First Look Teaser" on December 1, 2025, sparked immediate and intense speculation about a near-future launch.

• The Game Awards Prediction: Given the timing of the teaser and the studio's previous major announcements at high-profile events, many fans and industry observers are speculating that a full trailer and definitive release date could be announced at The Game Awards, which typically takes place in early December.
• Release Window: Previous major DLCs, like Annihilation Instinct and Enchantment Under the Sea (released January 28, 2025), have had a staggered release schedule. The current consensus among the community is that a release in late 2025 or early 2026 is highly likely, especially considering the developers' focus on wrapping up *Part 1* before fully diving into *Atomic Heart 2*.
• Atomic Pass Inclusion: The Atomic Heart DLC #4 is the final piece of content included in the Atomic Pass, alongside the three previous expansions: Annihilation Instinct, Trapped in Limbo, and Enchantment Under the Sea. Players who purchased the Gold or Premium Editions of the game will receive this final chapter automatically upon release.

The countdown has officially begun for the biggest and most anticipated expansion in the *Atomic Heart* saga. The final confrontation with CHAR-les and the shocking revelations about the canonical ending are poised to make DLC #4 a must-play for anyone who has followed Major P-3’s journey through the twisted, beautiful world of Facility 3826 and the retro-futuristic Soviet Union.