Marathon’s Vault Breaker Lands as Bungie Loses Players and Leadership

Bungie added a two-week PvE mode called Vault Breaker to Marathon on Tuesday, a roguelite raid built around a frozen map called Cryo Archive. Runners can drop in solo, in duos or in trios, raiding vaults guarded by UESC troops and choosing when to extract before the archive gets tougher.

The mode landed four days after Marathon’s second game director in two years announced he was quitting, and weeks after layoffs thinned Bungie’s remaining staff by roughly half. A fuller PvE mode is still a season away.

Vault Breaker Turns Marathon Into a Two-Week Roguelite

Eurogamer first detailed the mode this week alongside new gameplay footage of Cryo Archive vault raids. The pitch is simple: raid a vault, grow stronger between runs, then decide whether greed or the extraction elevator wins.

• Duration – two weeks, ending August 4
• Party size – solo, duo or trio, open to any Runner level
• Loadout – a Sponsored Kit only; player-made loadouts are not supported
• Gear rule – anything earned inside Vault Breaker cannot be used in Marathon’s normal modes
• New-player bonus – killing a UESC Commander earns Tier One Vault Data even without extracting

Vault Data is the currency that upgrades a Runner’s Sponsored Kit for the next run. Extract, and everything but event currency and rewards converts into more of it. The one bridge back to the main game is the Vault Breaker Armory, where that same currency buys gear usable in Marathon’s normal rotation. Everything else about a run stays sealed inside the mode.

Marathon’s Steam Population Has Fallen Below 1,000 Twice This Month

Marathon opened on March 5 to a Steam peak of 88,337 concurrent players. By July 7 and again on July 9, that number had fallen under 1,000 twice in the same week, bottoming out at 641 and 822 players, according to Gamereactor’s read of SteamDB data.

Two weeks later the slide hadn’t stopped. Tracker Network’s live population count showed Marathon’s active base down 51.3 percent over the trailing month, with roughly 2,279 people playing at any given moment, a drop of almost 97 percent from opening night’s peak.

Bungie had already tried a free access week billed as a make or break test to pull players back for Season 2. Vault Breaker, timed to two weeks and locked to gear that can’t leave the mode, reads like the next attempt to buy the game some room.

Who Replaced Joe Ziegler as Marathon’s Game Director?

Assistant game director Del Chafe III, a former Destiny 2 design lead, now runs Marathon’s day-to-day direction alongside creative director Julia Nardin. Joe Ziegler, who joined Bungie in 2022 and took over as Marathon’s director during development, made Friday, July 17 his last day and posted the news himself on X.

I’ll be heading to something new, somewhere else, and will update you on where and what soon.

Ziegler, Marathon’s public face for most of its development and its first four months on shelves, gave no reason for leaving beyond that note. He isn’t the only senior departure this summer. Former Marathon design lead Lars Bakken, a Bungie veteran of more than two decades, left in June and is now, in PC Gamer’s phrase, retired from the games industry entirely.

Layoffs Emptied Bungie’s Halls Before the Patch Shipped

Sony confirmed major cuts at Bungie on June 25, tied to Destiny 2’s final content update and a full pivot to Marathon. PlayStation CEO Hermen Hulst said the reductions hit most of the Destiny team along with some Marathon staff and Sony support employees.

Forbes contributor Paul Tassi had reported before the cuts landed that Bungie was targeting a range of 40 to 55 percent of the studio. A Washington state WARN filing later counted 292 affected workers at Bungie’s Bellevue offices, while Tassi reported the actual layoff call included more than 400 people, pointing to cuts wider than that single filing.

Bungie studio head Justin Truman stepped down after less than a year in the role once the layoffs went through, GamesRadar reported. The cuts followed two earlier rounds, including 220 jobs cut in 2024, a stretch that has repeatedly touched the team now trying to keep Marathon alive. Sony’s 2022 purchase of Bungie for $3.6 billion has since been written down by roughly $766 million, according to Windows Central, and was reportedly an emergency acquisition meant to keep the studio solvent in the first place.

A Fired Director’s Name Still Sits in the Credits

Ziegler wasn’t Marathon’s first game director. He took the job over from Christopher Barrett, who was fired following accusations of sexual misconduct during the game’s development. Sony settled a lawsuit with Barrett last week, and Marathon’s credits now list him again as the game’s original game director, Gamereactor reported.

That has not dented critical reception. IGN’s review called Marathon Amazing and scored it 9 out of 10. The gap between that reception and the Steam charts is the whole problem Vault Breaker has to paper over: a game reviewers liked, that players increasingly aren’t opening.

Season 3’s Real PvE Mode Inherits an Unfinished Roadmap

Vault Breaker is explicitly a placeholder. Bungie has said a full, standalone PvE mode is coming with Season 3, expected in September 2026. Before he left, Ziegler had laid out a broader roadmap covering progression changes, Duos support, matchmaking updates and content stretching into 2027, according to The Game Post. He won’t be the one delivering it.

What we know:

• Season 3 starts in September 2026 with the promised full PvE mode.
• Ziegler’s roadmap covered progression changes, Duos support, matchmaking updates and content running into 2027.

What’s unconfirmed:

• Integration, meaning how separate the full PvE mode will be from Marathon’s normal extraction loop.
• Continuity, meaning whether Chafe and Nardin keep Ziegler’s original timeline intact.
• Vault Breaker’s return: Bungie hasn’t said whether the mode comes back after August 4.

Vault Breaker’s clock runs out August 4. Whatever Marathon becomes after that belongs to a leadership team that inherited the roadmap instead of writing it.