Got gifted a copy of Elden Ring Nightreign, but found that when using the seamless coop mod (for 2 player games), the deck controls would no longer work.
Anyways it turns out the solution is to set this as the launch options for the seamless mod executable:
SteamAppId=2622380 SteamGameId=2622380 SteamOverlayGameId=2622380 %command%
This makes the coop launcher be identified as the game itself, preventing any steam input issues. Note: if you seemingly get stuck on a steam loading screen after launching the game like this, you may just need to press the steam button and swap windows to the game.
Nightreign only supports 1 or 3 player modes, the mod lets you play with just two players.
As a somewhat busy adult with work and kids, finding time to play together with friends is kinda hard. We have some set times a week where we try to play together (but we have more than 3 players) and we often squeeze in 2 player game sessions when possible. Nightreign only supporting exactly 3 players for multiplayer didn’t really work for us.