just regular, we dont need it to be impossible, i am level 24, but i have a legendary sniper rifle that can still 3 shot the big guys and one shot the goblins, so we will need some high levels, 26 and up prefereably. i did most of it last night and ened up being more helpful than some of the 28s i was with. so if you have any friends who could assist please let them know.