How the hell did you guys finish phase 3 on this guy. I went in there with a group of around 865 players who have all cleared heroic EN and doing mythic raiding and we blew through the instance taking out every boss with no more than 1 or 2 wipes to learn them and moved on. Then we got to the last boss we spent over 3 hours on him easily wiping 30+ times. Phase 1 and 2 were fine but phase 3 was insta death in seconds everytime. We tried everything even had the ret pally go holy to help the priest and the phase 3 damage could not be healed through with 2 healers. Both characters were cranking out 400K hps and nothing. Finally people had to go back to real life after pulling an all nighter and we called it without downing him.
Any tips?