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The key to defeating Xhul'horac is properly prioritizing DPS. The kill order should be:
Wild Pyromaniacs
Unstable Voidfiends
Vanguard Akkelion
Omnus
Xhul'horac
Killing the adds quickly prevents additional patches of Chaotic Felblaze and Creeping Void from spawning, and reduces the chance of triggering accidental Shadowfel Annihilations.
The raid must also use the encounter area wisely, as even with excellent execution the available space will fill up quickly with Chaotic Felblaze and Creeping Void patches.
During Phase 1, tank Xhul'horac on the left side of the room near the Fel Portal; the raid should stack closely behind the boss
Players affected by Fel Surge should run out to the edge of the platform to drop the Chaotic Felblaze, then return to the stack
This should cause Wild Pyromaniacs to spawn clumped near the raid, where they can be easily stunned and quickly killed
During Phase 2, tank Xhul'horac on the right side of the room near the Void Portal; the raid should stack loosely behind the boss
Ranged DPS should finish off the existing Wild Pyromaniacs while the raid moves
Players affected by Void Surge should run out to the edge of the platform to drop the Creeping Void, then return to the stack
Players targeted by Volatile Voidstep should move slightly out of the spell effect, and kite the Unstable Voidfiend closer to other adds for cleave damage
Players with strong damage-reduction cooldowns should trigger Singularity alone to remove the Black Hole
As Phase 3 approaches, players should clear fire out of the center of the room by triggering Shadowfel Annihilations
In Phase 3, pull Xhul'horac to the center of the room and stack loosely
Run Fel Surge right and Void Surge left
Move Xhul'horac slowly around the center circle as fire spawns nearby
Players should carefully trigger Shadowfel Annihilation to clear space before the raid moves into it
As Phase 4 begins, kill the remaining Wild Pyromaniacs and Unstable Voidfiends; no more of these adds will spawn
Continue running Fel Surge and Void Surge in opposite directions
Use Bloodlust/ Heroism/ Time Warp to kill the boss quickly, before Overwhelming Chaos becomes too powerful
Tank Responsibilities
During Phases 1 and 2, one tank should take the large add while the other tank tanks Xhul'horac
The add tank should use cooldowns during Felblaze Flurry and Withering Gaze
The boss tank should use cooldowns for impending Fel Strike and Void Strike casts
During Phases 3 and 4, tanks must taunt Xhul'horac frequently, so that one tank takes every Fel Strike, and the other takes every Void Strike
Assist in stunning and interrupting Wild Pyromaniacs when possible
At all times, move Xhul'horac away from nearby Chaotic Felblaze or Creeping Void patches
Damage-Dealer Responsibilities
At all times, the DPS priority should be Wild Pyromaniac > Unstable Voidfiend > Vanguard Akkelion or Omnus > Xhul'horac
Stun or interrupt the Wild Pyromaniacs to prevent Fel Orb casts from going off
Run out of the raid with Fel Surge or Void Surge
If affected by Chains of Fel, run away from the other affected players
If targeted by Volatile Voidstep, move out of the purple indicator before the Unstable Voidfiend teleports to you
Use Voidtouched or Feltouched to trigger Shadowfel Annihilation and clear space in the center of the room when you have high health and/or a personal cooldown available
Healer Responsibilities
During Phases 1 and 2, the boss tank will require heavy healing to recover from Fel Strike or Void Strike
During Phase 1, players with Chains of Fel, Ablaze, or Felsinged will require additional single-target healing
During Phase 2, players with Void Surge or Wasting Void, or players who have taken Singularity damage, will require additional single-target healing
During Phase 3, tanks will be taunting frequently, and taking heavy damage from Fel Strike and Void Strike
During Phase 4, the raid will also take heavy damage from each Overwhelming Chaos cast
Use raid CDs to recover from mistakes with Shadowfel Annihilation, when many members of the raid are debuffed by the abilities mentioned above, during Black Hole, and during the final phase
Run out of the raid with Fel Surge or Void Surge
If affected by Chains of Fel, run away from the other affected players
If targeted by Volatile Voidstep, move out of the purple indicator before the Unstable Voidfiend teleports to you
Use Voidtouched or Feltouched to trigger Shadowfel Annihilation and clear space in the center of the room when you have high health and/or a personal cooldown available