I'd love to create a very challenging multiplayer campaign.

It would involve being stranded on a very hostile island/continent like in Path of Exile or Risen, since I really like the feeling of discomfort and being lost somewhere in a game.

I worked as a professional level designer before, so I should be able to familiarize myself with the map editing tools quite quickly. I'm really bad when it comes to scripting though, so that might become an issue smirk