What is Vault Breaker in Marathon? PvE mode explained

Marathon’s highly anticipated experimental PvE mode arrives on July 21 as part of the game’s mid-season 2 update. Vault Breaker is a limited-time roguelite mode in which players infiltrate Vaults in Cryo Archive to collect Vault Data. 

For those unaware, Vaults in Marathon are heavily guarded locations within Cryo Archive that contain the best loot in the game. In Vault Breaker, players can expect to encounter some of the game’s tougher Vaults full of UESC bots and Warden bosses.