>>19329782Apply debuffs on Greg to apply it on the whole raid. If the debuff counter is green, you do extra damage to everyone, if it's red the boss deals extra damage
Kill the organ with an ex skill if the black side is facing to you, leave it alone if it's the white side. The white side removes a debuff from the side it's facing, the black side increases damage received
Kill the choir before they can receive their damage buff. Trigger the EX just before they spawn if necessary
In the final phase of the fight recovery cost will increase exponentially so you better burst as much damage as you can then