This encounter is notable in that it presents different mechanics for LFR, Normal, Heroic, and Mythic difficulties. The majority of this guide will describe the Normal mode mechanics; additional information on other difficulties can be found in the LFR, Heroic, and Mythic difficulty sections of this guide.
The main objective of the Hellfire Assault encounter is to break down the Reinforced Hellfire Door that is barring players from entering the Hellfire Citadel.
If a player dies while carrying
Felfire Munitions, the box will drop near the player's corpse, and another player can pick it up.
Felfire Artillery attacking the Hellfire Cannon
The Iron Horde will be defending the Citadel by attempting to destroy the Hellfire Cannons that players are using to break down the Reinforced Hellfire Door.
If a Hellfire Cannon is destroyed, it will unleash
Hellfire Destruction, instantly killing all players
The Felfire Flamebelcher, Felfire Crusher, and Felfire Artillery Siege Weapons will attack the Hellfire Cannons until destroyed
Additionally, any untanked Hellfire Reinforcement adds will also use their damaging abilities on the Hellfire Cannons
Hellfire Reinforcements consist of the familiar trash mobs - Gorebound Felcasters, Hulking Berserkers, Contracted Engineers, and Iron Dragoons
This fight requires players to quickly prioritize adds based on their threat level to the Hellfire Cannons and to the raid, is heavy on AoE, and has moderate movement requirements.
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Targeted by Howling Axe
At the start of the encounter, players will be faced with a mini-boss, Siegemaster Mar'tak, who is accompanied by a Gorebound Felcaster, a Contracted Engineer, and two Iron Dragoons.
Felfire Crushers will Bore players with its electrified ram
And will Burn players beside or behind it
Throughout the encounter, large metal capsules will be launched into the encounter area.
The impact point for these capsules is marked by large orange ground effects
Players within a few yards of the impact will take
Capsule Impact damage and be knocked back
Once landed, the capsules will open, and Hellfire Reinforcement adds will emerge
Tanks must quickly pick these adds up so they do not run to the Hellfire Cannons and damage them - particularly the Hulking Berserkers
Players should kill the adds according to the appropriate kill priority
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Fel-Infused Siege Weapons
After a short time, Fel-Infused Siege Weapons will enter the battle, heading toward a Hellfire Cannon with the intent to destroy it. There are three types of Siege Weapon vehicles that players will deal with on the Normal difficulty of this encounter.
Felfire Flamebelchers will
Belch Flame at the Cannons, dealing heavy damage to the Cannon with each shot, and also dealing damage to players within 3 yards of the impact
Felfire Crushers will
Bore any players standing in its path, bears several untargetable Gorebound Siegeriders that blast
Burn off the sides and back of the vehicle, and will
Crush the Hellfire Cannon upon reaching it, quickly destroying it
Felfire Artillery will fire
Artillery Blast at the Cannons, dealing extremely heavy damage to the Cannon and any players within 40 yards
Except while carrying
Felfire Munitions to the Hellfire Cannons, or picking up adds that slipped past the tank, players should stay away from the Cannons to avoid taking incidental damage from these effects
Players must kill these Siege Weapons as quickly as possible, and carry the
Felfire Munitions to the Hellfire Cannon so the Cannons can shoot the Reinforced Hellfire Door. Destroying the Reinforced Hellfire Door will complete the encounter.