So Larian have spoken about wanting to add more to the game but not knowing what that would be. So here's and suggestion!
How about a postgame arena (it can be unlocked when you beat the game end you get to return to the last save just before the final boss)
In this Arena you will get to replay all the bosses of the game in a boss rush, to really test out your builds and having some fun after clearing the game.
To get it to keep being interesting it can become harder and harder for every time you beat it. First time its just the normal bosses as they where, next time on "lvl 2" of the rush. They might have 10% more hp. lvl 3 20% more hp and maybe +1 to damage. And so on. I don't think their armor should increase cus how fun is it to just miss them? And then it keeps going like that.
If you clear 10 levels maybe get an achievement but let it go up to like a max turn of 100 or something and people can really test out the most OP of builds and see how far they can get!
I think this would be something fun to do and look forward to when replaying the game and since the bosses already exist Larian wouldn't need to put in work on creating new npcs.
What do people think?