Bungie's Marathon Symbiosis update adds Expedition, the shooter's first PvE-only mode, plus Deathmatch beta, Limbo, new weapons, Open Play Week, and a reworked Perimeter zone.
Image: blog.playstation.com
Marathon gets its first PvE-only lane on December 8
The Marathon Symbiosis update launches December 8, and its headline change is Expedition, a new PvE-only activity built around a three-run series. Sony Interactive Entertainment's Tim Turi detailed the update on PlayStation Blog, saying Expedition can be played solo or with a crew and removes PvP threats while adding new combat and environmental challenges.
That is the sharpest shift in this update because Symbiosis is not simply adding another playlist to the existing rotation. Bungie is carving out a mode where the pressure comes from the run structure, enemies, hazards, and build choices rather than another squad crashing the fight. For players who like Marathon's weapon handling but have been waiting for a lower-friction way into its systems, the Marathon PvE Expedition mode is the feature to watch.
Bungie is also adding a 3v3 Deathmatch beta, the Limbo social space, the Bishop Runner shell, the V17 Flamethrower, the Maverick revolver, and an overhauled Perimeter zone. The full Marathon December 8 update reads like a broad mode-mix correction: safer PvE, contained PvP, a place to test gear, and a refreshed combat space on Tau Ceti IV.
Expedition changes the risk profile without turning Marathon into a campaign
The confirmed structure is specific but still leaves room for major questions. PlayStation Blog describes Expedition as Phase 1 of a new PvE-only mode where players run a three-part series, either alone or in a crew. During a run, players use Flash Boosts to shape their build. The source material does not describe Expedition as a story campaign, raid, offline mode, or replacement for Marathon's PvP-focused identity.
MMOHuts reports that Expedition is launching as a permanent PvE mode, while the official PlayStation Blog wording calls it Phase 1 of a new PvE-only mode. Those descriptions are compatible, but they emphasize different things. The official post confirms the first phase and the rules of play; MMOHuts adds the permanent label in its coverage of Bungie's details.
For FPS players, the practical appeal is obvious. A PvE-only playlist lets players practice movement, ability timing, weapon ranges, and squad coordination without being third-partied by a human crew. It also gives Bungie a cleaner lane for encounter tuning. If a fight feels cheap in Expedition, the culprit cannot be chalked up to another team entering from a weird angle. That makes the mode a useful test for Bungie's combat sandbox, especially with new weapons arriving at the same time.
Deathmatch beta gives PvP a smaller, lower-stakes test bed
Symbiosis does not move Marathon away from PvP. It adds Deathmatch in beta, described on PlayStation Blog as an experimental mode with bite-sized 3v3 Team Deathmatch matches. Two crews compete for points, and players do not risk their permanent loadouts.
That last detail matters for pacing. Permanent-loadout risk can create memorable stakes, but it also slows down how players experiment. A no-risk 3v3 mode gives Bungie a cleaner read on weapon balance, team fighting, peeking discipline, and close-quarters pressure without the noise of extraction-style loss aversion. It also gives competitive players a way to warm up or test a new gun before taking it into higher-risk play.
Limbo supports that same idea from the non-matchmaking side. Bungie describes it as a social space where Runners can connect, use firing ranges to test weapons and gear, and challenge each other in a dueling pit. That is a basic quality-of-life need for a shooter with permanent loadouts and build choices. If the sandbox is going to expand, players need somewhere to feel out recoil, damage rhythm, and kit timing before a real run starts.
Perimeter's rework puts the new sandbox into a changed combat space
The updated Perimeter zone is the other major pillar of Symbiosis. According to PlayStation Blog, fungal growth and alien life have transformed the area, adding new playable spaces such as the underground Burrows and the submerged Reservoir. The Tick Queen is also being added as a threat lurking beneath the surface.
Bungie has not provided full layout details in the supplied source material, so it is too early to call how Perimeter will play in terms of sightlines, rotation routes, or choke points. What is confirmed is that the zone is expanding into distinct new spaces, which matters because Marathon's new modes are arriving alongside a map-side shakeup rather than landing on an unchanged board.
The new weapons are built to stress that board in different ways. PlayStation Blog says the V17 Flamethrower offers short-range area denial, while the Maverick introduces a revolver archetype with a hand-cannon feel. That gives Symbiosis one tool for space control and one for precision rhythm. Add the Bishop Runner shell, described as a fast, surgical blade-wielding robot fantasy, and Bungie is clearly pushing both movement and close-range pressure in the same update.
Open Play Week makes Symbiosis a public audition
Open Play Week runs from December 8 to December 15 alongside the Marathon Symbiosis update. PlayStation Blog says players can experience Marathon during that window, and MMOHuts reports that anyone can download and play the full game during Open Play Week, with progress and unlocked items carrying over if they buy Marathon afterward.
The access details still come with platform and account realities. PlayStation Blog states that Marathon is available now on PS5 with full cross-play and cross-save support. It also notes that gameplay requires internet access and a paid subscription on console, sold separately. For cross-save, the post says players need an internet connection, a compatible copy of Marathon on each system they use, and a system network account linked to their Bungie.net account.
Bungie is also running a Crew Up event tied to Expedition, according to MMOHuts. The event is scheduled from December 8 at 12 p.m. PT through December 22 at 10 a.m. PT, requires players to team up with at least one other person who has redeemed the code DMA-T7Y-XJL through bungie.net/redeem once Symbiosis is live, and offers Codex entries plus cosmetics. MMOHuts lists the rewards as the Queen's Nest emblem, Queen's Dominion background, Queen's Maw weapon sticker, Cluster Bunch weapon charm, Arata Vectus Destroyer skin, and Exterminator title. Players joining during Open Play Week can participate at no extra cost during that window, but MMOHuts says they will need a Marathon license after December 15 to keep playing through the rest of the event.
The real test is whether the new modes hold after the free week
As a shooter update, Symbiosis is built around a sensible split. Expedition gives PvE players and cautious newcomers a place to learn the sandbox without PvP interruption. Deathmatch beta gives competitive players short matches without permanent-loadout risk. Limbo gives everyone a firing range and a dueling pit. Perimeter, Bishop, and the new weapons give the update enough combat variables to feel like a live sandbox shift rather than a menu reshuffle.
The unanswered questions are the ones that decide retention. Bungie has confirmed the structure of Expedition, but the supplied sources do not detail its reward cadence, matchmaking options, difficulty scaling, enemy variety across the three-run series, or how Phase 1 will expand later. The studio has confirmed Deathmatch is experimental, but it has not said in the provided material how long the beta label will last or whether the mode will become a permanent competitive pillar.
For players waiting on a broader Bungie reset around Marathon's live direction, the December 8 update provides a concrete checklist. Try Expedition first if PvP pressure has kept you away. Use Limbo and Deathmatch beta if your main concern is gunfeel, duels, and low-stakes reps. Wait for post-launch impressions if your decision depends on long-term rewards, PvE depth, or whether the Tick Queen and Perimeter changes support repeat play beyond Open Play Week.