Bungie has released a gameplay trailer showcasing Marathon's upcoming Symbiosis update, which will launch on December 8. The update introduces Expedition, a permanent PvE mode, alongside a new social space called Limbo and a beta for Team Deathmatch. Bungie describes the release as the beginning of "the evolution of Marathon," with "a plethora of updates and changes" planned for the game.

One of the update's main additions is Expedition, Marathon's newly named permanent PvE mode. Described in the trailer as a "co-op PvE roguelite," it marks the first phase of Bungie's PvE plans. The developer has not yet shared further details about its gameplay, but its description of Expedition as "phase one" suggests that development of the PvE experience will continue.

Symbiosis will also introduce Limbo, a social space where players can spend time together without facing combat threats. The area appears to include a designated space for friendly shooting, while a firing range will let players test weapons without entering more dangerous locations.

The Perimeter map is also receiving an expansion, adding new points of interest and tunnels. Meanwhile, a new runner shell named Bishop will join the game, bringing a sword-wielding character to the roster.

For players more interested in competitive multiplayer, the update will introduce a beta for Marathon's Team Deathmatch mode. Bungie's latest trailer has already received positive reactions from players on Reddit and social media, with Bishop also attracting attention from the community.

The December 8 launch will also mark the beginning of an open play week, allowing players to access Marathon for free. The offer includes the new modes and content arriving with Symbiosis.

Players who decide to purchase the game after trying it during the free-play period will retain their progress and earned items. This means existing progress will carry over if they choose to continue playing after the open play week ends.