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Tank Dia Darkwhisper more than 25 yards away from the other two bosses, to avoid Void Haze
The primary DPS target should be Gurtogg, but cleaving onto Jubei'thos and carefully multi-dotting Dia to lower their health below 50% is fine
The player with Fel Rage should kite Gurtogg about 25-30 yards away from the tank, then focus on survival and dealing damage while under the increased damage effect
External damage reduction CDs should be used for Fel Rage on vulnerable players or on the Dia tank for Nightmare Visage
Switch DPS to Jubei'thos's Mirror Images when he uses Windwalk
Healers should dispel Mark of the Necromancer on any player in danger of death, or, when its icon becomes red in colour ( Mark of the Necromancer)
When Dia Deathwhisper begins to cast Reap, players with Mark of the Necromancer must run out of raid to drop the Reap zones in an unused area of the room
Use raid healing or damage-reduction cooldowns for each "ultimate" ability usage ( Wailing Horror, Demolishing Leap, Windwalk), and as frequently as possible during Dia's final hour phase
This encounter has a 10 minute Berserk timer, after which the remaining bosses will gain 500% damage and quickly wipe the raid
The recommended kill order for this fight is:
Gurtogg Bloodboil
Blademaster Jubei'thos
Dia Darkwhisper
Do not try to evenly damage all three bosses - the fight becomes easier with each boss that is eliminated, and pushing all three below 30% health at the same time is very difficult. (This is the objective of the achievement Don't Fear the Reaper.) Dia is recommended last because dealing with the entire raid's Mark of the Necromancer for the rest of the fight is too taxing for healers. Gurtogg is recommended first because his Tainted Blood is the weakest of the three abilities that linger after death.
The raid must kill Gurtogg quickly when he reaches 30% health and gains Tainted Blood, since the stacks carry through for the rest of the fight, making every subsequent mechanic more dangerous. It is helpful if the raid either kills Gurtogg before Demolishing Leap begins at approximately 3:45-3:55 into the fight, or that Gurtogg does not fall below 30% until the Demolishing Leap has completed. If Gurtogg is still above 30% health as Demolishing Leap approaches, the raid can switch to attacking Jubei'thos and getting him low (but not below 30%!), then make a hard swap back to Gurtogg after the Leap has ended.
Tank Responsibilities
One tank will be tanking Dia Deathwhisper the entire fight, while the other tank will have Gurtogg Bloodboil and Blademaster Jubei'thos
Pull Dia away from the other two bosses, so that her Void Haze does not make the other bosses immune to damage
The Dia tank should use survivability cooldowns during Nightmare Visage
The Gurtogg tank should use survivability cooldowns at high stacks of Acidic Wound, before Fel Rage occurs
When Fel Rage occurs, do not chase Gurtogg; use Gurtogg's travel to allow your stacks of Acidic Wound to drop
Move out of the path of Jubei'thos's Fel Blade attack, and move away from any incoming Wailing Horrors during Dia's Darkness ability
Should any Reap pools form near a boss, move the boss away so melee DPS can still attack
Damage-Dealer Responsibilities
Carefully manage multi-DoTting and cleave to avoid pushing two bosses below 30% at the same time
If afflicted by Fel Rage, use personal damage-reduction CDs to survive, drag the boss about 20-30 yards away from the tank, and deal as much damage to Gurtogg as possible
When possible, remove Gurtogg's Fury using an Enrage-dispelling effect
When Jubei'thos uses Windwalk to summon Mirror Images, kill the Images quickly to reduce the amount of damage the raid will take
Move out of the path of Jubei'thos's Fel Bladeattack, and move away from any incoming Wailing Horrors during Dia's Darkness ability
If afflicted by Mark of the Necromancer when Dia begins casting Reap, move out of the raid to form the Reap pool in an unused area of the room
Healer Responsibilities
Players with Fel Rage will require heavy healing, and may need external CDs such as Ironbark or Pain Suppression
Tanks will need additional healing at high stacks of Acidic Wound (Gurtogg tank) or during Nightmare Visage (Dia tank)
Dispel Mark of the Necromancer when affected players gain the red variant of the debuff ( Mark of the Necromancer)
Additionally, should Mark of the Necromancer land on a tank, be sure to dispel it from the tank before Reap occurs
Use raid healing or damage-reduction CDs for each "ultimate" ability; these occur approximately 1:15 apart
When Dia reaches 30% health and afflicts half of the raid with Mark of the Necromancer, dispel aggressively to keep raid damage low
Move out of the path of Jubei'thos's Fel Blade attack, and move away from any incoming Wailing Horrors during Dia's Darkness ability
If afflicted by Mark of the Necromancer when Dia begins casting Reap, move out of the raid to form the Reap pool in an unused area of the room