Dark Souls 2 seamless co-op mod is nearly ready for alpha testing

Modder Yui — the person behind seamless co-op mods for Elden Ring, Nightreign, and Dark Souls 1 — says the Dark Souls 2 version is close to being ready for alpha testing. There's no firm date yet, but a new YouTube video and Patreon post serve as Yui's official signal that the mod could actually ship.

When testing opens, the mod will support up to six players in co-op and will only work with the Scholar of the First Sin edition of the game. The original Dark Souls 2 is out because it's 32-bit, while Scholar of the First Sin runs on 64-bit — the same reason Yui's Dark Souls 1 mod requires the Remastered version. Alpha access will be free for everyone, but bug reporting and direct support from Yui will be gated behind Patreon at launch.

Yui admitted the original April 2025 announcement came a bit prematurely, before enough progress had been made to justify it. Since then the project has grown into one of their most complicated and ambitious to date — and the reason is Dark Souls 2's engine. While Dark Souls 1, 3, Sekiro, Elden Ring, and Nightreign all share a closely related engine where knowledge transfers between games, Dark Souls 2 runs on a separate branch with significant modifications. For reverse engineering purposes, Yui says, it's basically a completely different game.