Seamless Co-op for Elden Ring. Instead of the jank-ass summoning system, it lets you just play the entire game, start to finish, with between two and SIX players.

Honorable mentions:

• Total War Warhammer has a bunch of mods I consider essential (level 4 settlements in minor settlements, reduced penalties at higher difficulties, legendary lords joining another faction if theirs is destroyed), but individually none stand out that much.

• Mount and Blade: Warband has a ton of total overhauls that are usually interesting even if I wouldn't finish them. Gekokujo is set in Japan, so no shields and now guns exist. Warsword Conquest is the jankest fucking version of warhammer I've ever seen, where all the fantasy creatures are made by just stretching and warping the basic human in ways that look horrific. Prophesy of Pendor adds an end-game and ramps the difficulty up to a million. All of these suffer from not actually changing up the core gameplay too much, though, which means it's still kind of an empty sandbox full of cardboard cutout NPCs no matter what.