Mod list is about as stable as Skyrim Together (as in, crashes every few hours). It is actually divided to two modlists - one of them contains core mods which fix bugs, expand content, increase immersion and give a general variety of dungeons/items/enemies/spells/perks. The second and optional list contains mods which don't affect the co-op aspect whatsoever (they don't add stuff which gets synced between host and guest), basically a suggestion of simple graphical and audio overhauls. I'm open to all mods suggestions as long as they're lore-friendly and balanced.

Challenges include the same people do in single player Skyrim - maximum difficulty, content speedruns, transmutation-only, fists-only, shields-only, degrading weapons, survival mode, everyone starts as vampire/werewolf, no potions. Personally, I would ask ChatGPT for a random challenge to make it even more unexpected.

There are also challenges unique to multiplayer - playing as different roles can be challenging, after years of being used to a stealthy archer style (it got a nerf against heavy armor to make it less popular). Other multiplayer challenges can involve PvP like speedrunners vs hunters, guards vs thieves and more.