Since Warhammer 40,000: Space Marine 2's record-breaking launch last year, the modding community has produced incredible work. Their latest achievement, however, might be the most impressive to date.

Tom, also known as Warhammer Workshop and the creator behind Space Marine 2’s popular Astartes Overhaul, unveiled a 12-player co-op mod this week, and it looks phenomenal. Gameplay footage showcases multiple players joining forces against a Tyranid Trygon Prime in an intense encounter reminiscent of an MMO boss battle.

This breakthrough seemed unlikely, as the base game only supports up to three players in co-op. With support from developer Saber Interactive, the modding team not only surpassed that limit to enable 12-player sessions but also has ambitious plans to elevate the Space Marine 2 experience even further.

“Honestly, I’m amazed by Saber’s backing of the modding scene,” Tom shared with IGN. “None of us expected 12-player PvE to become a reality so quickly—yet here we are. Their support and trust have made this major milestone possible, and it fundamentally transforms what we can achieve.”

It’s important to note that the current release is a test version—functional and promising, but still a test. Unsurprisingly, 12-player co-op drastically alters the game's PvE balance, given that encounters designed for three players now face four times as many participants fighting Tyranids and Thousand Sons.

Now that 12-player support is unlocked, modders are developing enhancements to take full advantage. Tom mentioned the team is working on new modes such as prop hunt, PvP within operations, “massive” updates for the upcoming official horde mode, and, most excitingly, raid-inspired missions “featuring punishing boss fights that demand coordinated teamwork and introduce entirely new mechanics.”

The Space Marine 2 modding community has grown substantially, with roughly 20,000 active members in its primary Discord server.

“Whether you're creating mods or playing them, it's an exciting time,” Tom added. “Full credit to the Saber team for enabling all of this while continuing to release excellent official content—without any of the predatory battle-pass mechanics we’ve come to expect in modern games.”

It’s a thrilling period for Space Marine 2 overall, with a highly anticipated horde mode on the horizon, a new class in development, and more Operations maps and weapons incoming. Saber recently outlined Patch 8, confirmed horde mode details, and revealed its accompanying map.

Space Marine 3 has been officially confirmed, which comes as no surprise given the second game's tremendous success. This 12-player co-op mod makes us wonder if it offers a glimpse into the sequel's direction. When Space Marine 3 was announced, the developers teased "even more spectacular large-scale battles"—which certainly sounds like an expanded co-op player count.

Until more is revealed, modders will continue to keep the experience fresh and engaging. This latest mod is a perfect example of that commitment.