FromSoftware's new co-op roguelike offshoot Elden Ring Nightreign was designed at its core to be a three-player multiplayer experience, though it also supports playing solo if you'd like to with lower enemy and boss scaling (solo play will have some other accommodations as well after next week's Patch 1.02 update). One thing that game doesn't have, however, is a duos mode that lets you adventure in Limveld with one other Nightfarer.
Such an option would be greatly beneficial to folks who only have one other friend to play with, or only have one friend online at any given time. And the good news is that it might come to the game one day; director Junya Ishizaki said in an interview that FromSoftware "kind of overlooked and neglected the duos aspect" and that it's something that it's "looking at and considering for post-launch support."
