Vault Breaker PvE mode triples Marathon's player count, then surge quickly fades
Bungie shipped Update 1.1.5 on July 21, introducing Vault Breaker, an experimental cooperative PvE mode set in the Cryo Archive with no enemy players, running through August 4. The same update included weapon balance changes such as a WSTR shotgun damage buff and a Misriah 2442 nerf. Steam concurrent players jumped from around 5,000 to over 14,800 within hours of the mode going live, but the boost proved short lived, falling back under 10,000 within about 36 hours.
PC Gamer is an established gaming outlet reporting directly on the update and its player count impact.