The hardest fight in the game with DLC's.
Buff the druids accuracy and perception with priest spell blessing, devotions of the faithful, champion's boon and crown for the faithful.
Use relentless storm with druid, to stunlock enemies and spiritshift, so that you deal really much damage to the dragons.
What i have to say about the items: More than one +deflection item does not work (except for the shield), so replace it with something else, i did it not in the video, but it has not so a huge impact if you have 5 acc or 10% melee damage more.