Marathon's Symbiosis Update Brings Permanent PvE, 3v3 Deathmatch and a Free Week in December

Marathon's next major update removes one of the defining threats of its extraction gameplay: other players. Expedition, a permanent PvE experience arriving with Symbiosis on December 8, will allow solo Runners and crews to complete missions without worrying about hostile human teams.

That decision is a meaningful change for Bungie's shooter. Since launch, Marathon has built much of its tension around the uncertainty of entering a dangerous environment, collecting valuable equipment and attempting to escape before another crew takes everything away.

Symbiosis does not eliminate that original structure. Instead, it introduces separate experiences that emphasize different aspects of combat, exploration and character progression. Bungie detailed the new content on November 10 alongside a gameplay trailer, and the update is scheduled for PS5, Xbox Series X|S and PC.

Expedition makes PvE a permanent part of Marathon

Expedition's first phase is built around sequences of three runs. Players can tackle them individually or with a crew, facing environmental hazards and AI-controlled enemies while developing their character through temporary upgrades.

Those upgrades are called Flash Boosts. They allow players to modify their build during an Expedition series, introducing a roguelite-style progression element where decisions made during one run can influence subsequent encounters.

The absence of hostile Runners changes how players approach risk. Traditional extraction gameplay demands careful decisions about when to fight, what to carry and when to leave. Expedition shifts more attention toward surviving environmental challenges, handling enemies and improving a build across consecutive runs.

Bungie identifies this as phase one of its permanent PvE experience. The December launch should therefore be understood as an initial implementation, rather than the final form of the mode.

Its long-term appeal will depend on how varied the challenges become and whether the progression systems provide enough reasons to play multiple sequences. Those aspects cannot be established from a trailer alone.

A more dangerous Perimeter

Symbiosis also makes significant changes to Perimeter, one of Marathon's central exploration areas. Alien organisms and fungal growth have transformed the landscape, creating new spaces and encounters.

The newly announced locations include Burrows, an underground area, and Sunken Reservoir, a submerged environment. Bungie is also introducing the Tick Queen, a creature lurking beneath Tau Ceti IV's surface.

These additions matter because Perimeter is closely tied to the game's early learning experience. More varied exploration could give players better reasons to revisit the environment, especially when combined with new PvE objectives.

Bungie has not detailed every encounter associated with the Tick Queen or fully explained how the new locations will affect the existing extraction routes. Those questions remain open until the update becomes playable.

Deathmatch offers competitive combat without gear loss

Players who prefer fighting human opponents will receive another option. Deathmatch is an experimental 3v3 PvP mode in which two teams compete for points in shorter encounters.

Its biggest distinction from extraction is what happens after a defeat. Players will not risk losing their permanent loadouts in Deathmatch, reducing the consequences of entering a fight with unfamiliar weapons or experimenting with a different Runner shell.

This could make Deathmatch useful as a training environment as well as a standalone competitive activity. A player wanting to improve combat skills can spend time fighting opponents without first preparing and risking a valuable extraction loadout.

There is a trade-off, though. Removing the extraction stakes also removes part of what makes Marathon different from more conventional shooters. Bungie will need to establish whether the mode's combat and progression provide enough appeal on their own.

Deathmatch launches in beta, with its future development dependent on Bungie's testing and player feedback.

A social hub and a new way to fight

The new Bishop Runner shell is designed around fast, precise melee combat. Bungie describes Bishop as a blade-wielding robot, suggesting a substantially different combat identity from more conventional firearm-focused loadouts.

Symbiosis also introduces two weapons. The V17 Flamethrower focuses on close-range area denial, while the Maverick offers a revolver-style hand cannon archetype.

Another notable addition is Limbo, a dedicated social space with firing ranges and a dueling pit. Players will be able to meet other Runners, experiment with gear and challenge one another without first entering a traditional extraction mission.

Limbo may be particularly useful for newcomers. Marathon combines different Runner abilities, equipment systems and progression mechanics, and learning them under the pressure of an extraction run can be demanding.

A dedicated testing environment gives players a place to become familiar with those systems before committing valuable resources.

A free week designed to introduce the new Marathon

From December 8 to December 15, Bungie will run an Open Play Week. Anyone will be able to download and experience Marathon without purchasing the game, including the content introduced by Symbiosis.

The promotion does not turn Marathon into a permanently free-to-play title. Once the open period ends, players will need a purchased copy to continue accessing the game. Any items and progression earned during the free week can be retained if they subsequently buy it.

Bungie is also organizing Crew Up, a cooperative event running through December 22. Participating players will complete challenges together in Expedition to earn cosmetic rewards, including emblems, weapon decorations and other customization items.

The event requires teamwork. Bungie specifies that the relevant challenges cannot be completed entirely solo, and participants must form a crew with at least one other eligible player.

Cross-play support allows teams to include players from PlayStation 5, Xbox Series X|S and Steam. Cross-save is also supported, subject to Bungie's account-linking and game ownership requirements.

A larger change in Bungie's development approach

Symbiosis is part of a longer development plan announced earlier in 2026. Bungie moved away from a rigid seasonal release structure, choosing instead to organize major updates around development readiness and the scale of their features.

Content initially intended for September was moved into the December 8 release. A smaller October update focused on refreshing progression and rewards while the team continued developing Symbiosis.

Bungie has acknowledged that Marathon did not reach as many players as originally hoped. Its response includes broader gameplay options, improvements to onboarding, more long-term goals and an increased emphasis on survival within the game's alien world.

The studio has also emphasized that extraction remains a central part of Marathon. The introduction of permanent PvE and experimental Deathmatch is an expansion of its systems, not the abandonment of its original PvPvE identity.

Further development is planned for March 2027, when Bungie intends to connect and deepen several of the systems being established during the current update cycle.

For now, December 8 is the important date. Existing owners will receive Symbiosis as an update, while newcomers will have one week to try the revised experience without buying Marathon.