Marathon Symbiosis update arrives December 8 with permanent PvE

Bungie says the Symbiosis update for Marathon launches on December 8. The update adds Expedition, a permanent co-op PvE mode with roguelite elements. Players can play solo or in a crew through a three-run series, using randomized Flash Boosts upgrades to face escalating environmental and combat challenges.

Marathon · official art via IGDB

The update also adds a beta PvP Deathmatch mode featuring 3x3 team bouts where players do not risk their permanent loadouts. Bungie expanded the Perimeter zone on Tau Ceti IV with fungal growth and alien life, adding the underground Burrows and submerged Reservoir areas. A new social hub called Limbo includes a firing range and a duelling pit.

New gear arrives with the update, including the sword-wielding Bishop Runner shell, the Maverick pistol, throwing knives, hack grenades, and the V17 flamethrower. Bungie will also hold an open play week from December 8 to December 15, allowing new players to access all content for free.