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The raid's initial focus should be on quickly AoEing down the Dragoons, Engineer, and Felcaster accompanying Siegemaster Mar'tak, then reducing Mar'tak's health to 50% before the first Siege Weapon reaches the raid. Once Mar'tak is gone, players' kill order should be:
Whichever Siege Weapon is currently active, especially if it is a Felfire Crusher
Gorebound Terror
Hulking Berserker
Contracted Engineer
Gorebound Felcaster
Iron Dragoon
Bolded enemies should be considered "high priority".
Damage on the Gorebound Felcasters must be managed carefully, so that only one Metamorphosis occurs at a time. This requires the most coordination of any mechanic in the fight:
Pick up Felfire Munitions
Between Siege Weapon spawns, the raid leader should mark a Felcaster to push
Once the marked Felcaster has transformed into a Terror, all DPS must kill it quickly before beginning to kill another Felcaster
It is very difficult to heal the raid through two Gorebound Terrors at the same time, and will drain healers' mana
DPS players should, where possible, line up their major DPS CDs with the Felfire Crusher vehicles, as these are the most dangerous - Crushers will very quickly kill a Hellfire Cannon, wiping the raid, if the Crusher reaches the Cannon.
Highly mobile players should be assigned to carry the Felfire Munitions to the Hellfire Cannons. Note that the Felfire Munitions will persist for 90 seconds, so the assigned players do not need to move immediately. Finish off any high-priority adds before carrying the Felfire Munitions to the Cannon.
Healing CDs should be used to counteract the Gorebound Terrors' Felfire Volley spam.
Tank Responsibilities
Fiery swirls mark the landing site for Reinforcements
The Fel-Infused Siege Weapons cannot be tanked
At the start, one tank should take Siegemaster Mar'tak and the other tank should take the rest of the adds
Once it spawns, move the Hulking Berserker far enough away from Mar'tak that the Inspiring Presence buff fades
If necessary, swap the Hulking Berserker after Siegemaster Mar'tak has fled, and swap future Hulking Berserkers after taking at least 2 stacks of Slam
To prevent Gorebound Felcasters from pushing to the Gorebound Terror phase prematurely, keep them away from Siege Weapons so they don't get cleaved
Keep an eye out for Capsules that will deliver the next wave of adds; stand back as they land to avoid taking Capsule Impact damage
Drag mobs away from the Contracted Engineers' bombs, so melee DPS do not take bomb damage
Interrupt the Gorebound Felcasters' Felfire Volley, and the Contracted Engineers' Conducted Shock Pulse, when possible
Use survivability cooldowns when Slam stacks are high
Move out of Shockwave and avoid the Burn from the Felfire Crusher
Damage-Dealer Responsibilities
Carry Felfire Munitions to the Cannons
Defeating the Siege Weapons quickly, so you can focus on other adds, is the key to success in this encounter
Multi-DoT classes should be cautious with the Gorebound Felcasters; pushing them to the Gorebound Terror phase early can cause raid wipes
Line up cooldowns with the Siege Weapons, particularly the Felfire Crusher
Stay spread out to avoid splashing Howling Axe or Conducted Shock Pulse damage to other players
Move out of Shockwave, away from bombs, and away from the Capsule Impact, and avoid taking Burn damage from the Felfire Crusher as it passes
Interrupt the Gorebound Felcasters' Felfire Volley, and the Contracted Engineers' Conducted Shock Pulse, when possible
Healer Responsibilities
Tank damage is very heavy while Hulking Berserkers are active, especially if the tank has 2+ stacks of Slam
Players with the Howling Axe debuff will take moderate to heavy damage shortly after the debuff expires
Raid damage will be spiky and unpredictable
Healing/damage-reduction CDs should be used when Gorebound Terrors are casting Felfire Volley
Dispel the Conducted Shock Pulse stun from affected players
Stay spread out to avoid splashing Howling Axe or Conducted Shock Pulse damage to other players
Move out of Shockwave, away from bombs, and away from the Capsule Impact, and avoid taking Burn damage from the Felfire Crusher as it passes
Interrupt the Gorebound Felcasters' Felfire Volley, and the Contracted Engineers' Conducted Shock Pulse, when possible