Marathon’s Vault Breaker, an experimental PvE mode that allowed even solo folks to take on the endgame map Cryo Archive, is wrapping up today, but Bungie does at least have a new event for you to have a go at in kind. It’s called Ordnance Heist, and while it doesn’t offer any major new features or radical changes, the big thing it does focus on is completing multiple runs across multiple maps, netting you an explosive weapon called the Firestorm.…