Vault Breaker PvE Mode Launches July 21
Bungie announced Vault Breaker, Marathon's first experimental PvE mode, running from July 21 to August 4 in a new area called Cryo Archive. Players can tackle it solo, in a duo, or as a trio with no enemy players, using roguelite run based progression to fight through UESC forces, vault security, and a mysterious entity called the Compiler.
Posted directly by Bungie through the official Steam news feed for Marathon.