Well after three tries i got the third boss down in utgarde pinnacle also did last boss without bane so whew. Screen shot here to show achievements was mad because 20 people in alliance didnt get spammed think a bug or something.

Let me tell u all about position lol. Figured out run down one side fast grab alot of mobs burn down. Now he will cast his breath ull see it move to opposite side run all the way down kill them all threw all spears at him left shammies at the door mobs come from and kept him far away.

This allowed him to chase me not them. GL all.