Marathon receives a major update next month with Season Symbiosis launching December 8th. The season introduces Expedition, a roguelite PvE mode playable in co-op that requires players to complete tasks before exfiltrating. A social space called Limbo opens alongside the update, offering hangout areas, a mini arena for matches, and a firing range for weapon testing.

The season adds a new runner shell named Bishop, a samurai-sword-wielding robot with enhanced jumping and a melee attack that hits multiple enemies. Bungie is also launching a beta for a team deathmatch mode featuring a deep-voiced announcer announcing kills, drawing comparisons to Halo. The update includes new weapons and larger alien enemies.

Marathon will be free to play from December 8th through December 15th.