Also, my level 4 party made it to and most of the way through level 5 during this campaign.

Fairly brutal mission where you fight a brutal slugfest of enemies while you can't take very many long rests or backtrack. Also requires the Supporter Pack DLC for some reason?????

Quite challenging, would recommend a level-5 party that doesn't need to long rest all that often, though I (barely) pulled it off, though nothing like a 100% run, with the level-4 party I had on hand. Has at least two branching paths by which you can complete the campaign, which is neat.