Warhammer 40,000: Space Marine 2 is getting 12-player support for co-op mode Operations thanks to a new mod. The mod, Astartes Overhaul, comes from Warhammer Workshop and is currently in a testing phase on PC.

A new mod called “Astartes Overhaul” aims to expand Saber Interactive’s Space Marine 2 by introducing a 12-player Operations mode. This mod will be available exclusively on Steam and will switch up the existing co-op mode, which currently only supports three players.
Saber Interactive has previously not supported modding for the third-person action game, but developer Warhammer Workshop says not only is Saber behind the mod but that they “deserve all the praise.”
What’s New in the 12-Player Co-Op Mode
Operations is a three-player PvE co-op mode in Space Marine 2, but it’s about to get 4X larger with Astartes Overhaul, which will support 12 players. While the new player count will mean more of your friends can join, it also comes in time for the harder difficulties that Saber is planning to add to the game in the future.
The mod is currently in its early testing phase and is only available as a paid download from the Modding Hub Discord server. 12-player Operations is a chaotic experience, and you can watch how it playss, thanks to Chapter Master Valrak on X.
HOLY EMPEROR! Just tried the 12 player @SpaceMarine mod, incredible it felt like a MMO Dungeon! Amazing! Video coming today on it! #warhammer #warhammer40k #spacemarine2 pic.twitter.com/MpXLXx8Gwq
— Chapter Master Valrak (@CMValrak) May 1, 2025
What is the Astartes Overhaul Mod
The 12-player Operations mode comes as part of the in-development Astartes Overhaul mod, which looks to add new classes and weapons and rebalance the game, all while remaining true to the Warhammer 40K lore and universe.
While the mod is still an early build, Warhammer Workshop wants to drop a playable version this weekend on May 3 or May 4. It will be downloadable from the Modding Hub discord channel.
How to Access and Play the Mod
Warhammer Workshop is looking to launch a playable build of the Astartes Overhaul mod for Space Marine 2 this weekend from May 4. The mod will include the 12-player Operations mode and new weapons and customization options.
Space Marine 2 is a great game to play with friends, and with the upcoming mod it’s about to get even bigger and more intense. Check out the best deals for the game on PS5, Xbox Series X|S, and PC on our store pages and pick it up at the lowest price today.
Conclusion
Space Marine 2 is about to get a 12-player Operations mode thanks to the upcoming Astartes Overhaul mod from Warhammer Workshop. What do you think about the mod? Do you think it will enhance the experience or destroy a perfect mode? Share your thoughts in the comments.
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