Bungie’s Marathon Symbiosis update launches on December 8, 2026, and it is the biggest change to the extraction shooter since release: a permanent PvE mode called Expedition, a 3v3 Team Deathmatch beta, a reworked Perimeter zone, a new Bishop Runner shell, two new weapons and a social space named Limbo. A free Open Play Week runs December 8 to 15 so anyone can try it. Everything below comes from Bungie’s announcement as relayed on the PlayStation Blog, plus PC Gamer and Engadget; where Bungie has not said something yet, this guide says so.
Table of Contents
Quick answer: Marathon Symbiosis at a glance
- Release date: December 8, 2026, for all players. The sources we read give no start time yet.
- Open Play Week: December 8 to 15. PC Gamer reports the game is fully free to play that week, new modes included, and that progress and items carry over if you buy the game afterwards.
- New modes: Expedition (PvE only, phase 1) and Deathmatch (Beta, 3v3 PvP).
- New content: updated Perimeter zone, Bishop Runner shell, V17 Flamethrower and Maverick revolver, the Limbo social space.
- Platform note: the PlayStation Blog lists Marathon as available now on PS5 with full cross-play and cross-save; console play needs internet access and a paid subscription.
Facts from the PlayStation Blog post of November 10, 2026; details can still change before launch.
AI-generated illustration of the kind of fungal, flooded spaces Perimeter gains, not official art
What is in the Marathon Symbiosis update?
Bungie describes Symbiosis as the start of “the evolution of Marathon,” according to PC Gamer. The PlayStation Blog post by Sony’s Tim Turi lists the headline features:
| Feature | What Bungie says |
|---|---|
| Expedition | Phase 1 of a new PvE-only mode built around a three-run series. Play solo or with a crew, face combat and environmental challenges with no PvP threats, and use Flash Boosts to shape your build during a run. |
| Deathmatch (Beta) | An experimental PvP mode of bite-sized 3v3 Team Deathmatch matches. Two crews compete for points without risking their permanent loadouts. |
| Updated Perimeter | Fungal growth and alien life transform the zone, adding the underground Burrows and the submerged Reservoir. A boss called the Tick Queen lurks deep beneath the surface. |
| Limbo | A new social space with firing ranges to test weapons and gear, and a dueling pit. |
| Bishop Runner shell | A fast, surgical blade-wielding robot. |
| New weapons | The V17 Flamethrower (short-range area denial) and the Maverick, a revolver with a hand-cannon feel. |
How does Expedition PvE work?
Expedition is the part most players have asked about, and also the part with the fewest details. What is confirmed: it is PvE only, it is structured as a three-run series, you can play solo or with a crew, and Flash Boosts let you shape your build as a run goes on. PC Gamer quotes Bungie’s teaser calling it a “co-op PvE roguelite” and notes that the mode becomes permanent, with the studio calling this “phase one” of its PvE plan.
What has not been shared in the sources we read: rewards, whether progress from Expedition feeds the normal progression, difficulty tiers, and what exactly a Flash Boost does. Engadget reported in September that the goal of the mode is to let players experiment with builds and sharpen their skills without being attacked by other players, with details still being finalized at that point. Treat any claim about loot or progression as unconfirmed until Bungie publishes patch notes.
For a sense of how the genre is handling the same question, see our report on the ARC Raiders PvE test results, where Embark said almost half of the rounds played were PvE.
AI-generated illustration of a firing range and dueling pit like the ones Limbo promises
What is Deathmatch (Beta)?
Deathmatch is a 3v3 Team Deathmatch mode that Bungie calls experimental, hence the Beta label. The key line from the PlayStation Blog is that crews compete for points “without risking their permanent loadouts,” which makes it the low-stakes alternative to extraction runs. Match length is described only as “bite-sized”; there is no map list or score limit in the announcement.
What changes in Perimeter, the Bishop shell and the weapons?
Perimeter is the first zone new Runners see, according to Engadget. Bungie says it is getting a more unique visual identity and new encounters. The new spaces are the Burrows (underground) and the Reservoir (submerged), and the Tick Queen is the boss to watch for.
Bishop is billed as a “high-performance robot samurai” in Bungie’s September description (via Engadget), a new shell archetype aimed at experienced players. The PlayStation Blog describes the fantasy as a fast, surgical, blade-wielding robot. Bungie has not published ability names or stats yet.
| New weapon | Archetype | Role per Bungie |
|---|---|---|
| V17 Flamethrower | Flamethrower | Short-range area denial |
| Maverick | Revolver | A new revolver archetype with a hand-cannon feel |
When is Open Play Week and who can play?
Open Play Week begins with Symbiosis on December 8 and ends December 15. Bungie also lists a “Crew Up Event” alongside it on the official Marathon site, under the headline “Marathon Symbiosis: Open Play Week and Crew Up Event”; the article itself is script-driven and we could not read its text, so we do not describe the event here. Per PC Gamer, the free week includes the new modes and content, and anything you earn carries over if you buy the game.
What should you do before December 8?
- Check your platform: the PlayStation Blog states cross-play and cross-save, and cross-save needs a copy for each system plus a platform account linked to your Bungie.net account.
- Link your accounts now if you plan to use cross-save, so it is not a launch-day task.
- Read the patch notes on release day for Expedition rewards and Deathmatch rules; those are not in the announcement.
- Remember the bigger picture: Engadget reported Bungie says an unnamed March 2027 update will be “meaningfully larger than Symbiosis,” with permanent PvE, PvP and PvEvP experiences, a new zone and alien enemies.
Other live-service updates we are tracking: Marvel Rivals Season 11 and the Apex Legends Godzilla event.
FAQ
What time does Marathon Symbiosis release on December 8?
The announcements we read give the date only. We will add a start time when Bungie publishes one.
Is Marathon free during Open Play Week?
PC Gamer reports it is fully free to play from December 8 to 15, including the new content, and progress carries over if you purchase the game.
Is Expedition PvE only?
Yes. The PlayStation Blog calls it a PvE-only mode with no PvP threats, played solo or with a crew across a three-run series.
Sources: PlayStation Blog, PC Gamer, Engadget, marathonthegame.com.
Checked November 12, 2026 at 09:42 UTC against the PlayStation Blog, PC Gamer and Engadget; Bungie can still change details before launch.
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Featured image: Bungie / Sony Interactive Entertainment
