Good day ladies and gents. Today a couple buddies and I took the keep on, and it was a fairly long affair... lasting roughly 2.5 hours.
While there were only 3 of us and DPS was lacking, the main problem we were running into was that Drodda was sometimes disappearing to all or a couple of us, leading us to restart the fight.
We were probably on the final boss for at least an hour... when we finally beat it.
Be on the lookout: if you're on the XBOX 1 then you may run into this glitch where you can still be attacked by Drodda, but she will summon more minions than usual and she will also be invisible for the rest of the fight (unless you get the chance to leave the fight and return)
Also: the most important thing seems to be dipping/diving/ducking/dodging.
Cinnamon