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By Anonymous
"Dungeons are custom adventure campaign that you can challenge alone or coop with friends"

I believe this is incorrect (unless you mean a local, one computer coop). I don't see any mechanic in game to add friends, and a post (albeit from 2 years ago) from a dev:
You're not the only one who's been asking us about Co-op - and for good reasons. We perfectly understand people wanting to play with their friends, and we also think that it would be a great thing if we could do that. However, when making a game you also have to make rational decisions based on your team and your budget.

What I'm saying is, it's not like we're AGAINST multiplayer. We thought about it, discussed about it, and concluded that based on our current plans we simply can't risk it for our first game. Remember that we don't have the firepower that some other game studios may have^^

This is not to say it's impossible for future game, and good surprise can always happen."

https://forums.solasta-game.com/forum/multiplayer-and-lan-game second post