I didn't find it that hard with the exception of the boss room. Even there, if you control the encounter you get through. Just stay together, get the knight, clear the way to the "obelisk" and dunk. Don't let the knights roam around and kill them even if you don't want to dunk. You just have to be careful and don't rush it. Solar warlocks are fantastic for that GM as you can use your heavy on the ads.