Zone:  Ulduar 
Subzone:  TheSiege 
Hard mode available:  Yes 
Mob type:  Mechanical 
Health (Normal):   ? 
Health (Heroic):   ? 

Strategy

The Flame Leviathan is a boss in Ulduar. This is a vehicle fight. He has about 15.5 million HP on 10-man and about 70 million on 25-man. The "hard modes" increase Flame Leviathan's HP as well as increasing his damage and giving him other abilities.

You never tank him. Instead, you kite him around using your vehicle abilities to kill him.

There are repair platforms on the side of the area preceding Flame Leviathan that vehicles can use to heal to full before starting the encounter.

Flame Leviathan Abilities

On the pull, and every 30 seconds thereafter, he will switch targets to a siege vehicle or demolisher, mark them, and follow them around.

He has a soft enrange due to Gathering Speed. You have to kite him, thanks to Battering Ram, and it becomes harder and harder to get away from him even with help from Steam Rush.

• Flame Vents: Inflicts 15000 Fire damage to enemies around the caster per second. Interruptable.

• Battering Ram: a melee range attack, Rams the target, dealing damage and knocking it forward. Debuffs them with "Battering Ram": Damage taken increased by 100%.

• Gathering Speed: periodically he moves a bit faster by gaining another stack of this buff. The stack is reset when he is stunned by Overload Circuit.

• He also fires rockets constantly at the raid, doing about 700 damage each time they land (about once every 1-2 seconds)

• He has 4 turrets with 64,000 HP (25-man). Passengers in the demolisher can be launched at him where they can destroy the turrets and then hit the Overload Circuit: stuns Flame Leviathan and causes him to take 50% more damage for 10 seconds.

Vehicles

The vehicles have a base HP that then increases based on the ilvl of your gear (tip: stop DE'ing trash epics with high ilevels and save them for Ulduar!)

If you're interested in the details of how the gear scaling works, read our article on Flame Leviathan gear scaling.

Salvaged Siege Engine

This vehicle demolishes towers as you clear the gauntlet and kites the Flame Leviathan.

It can carry a passenger.

• Ram: 15 yard range, 4 second cooldown, instant. Rams any enemies in front of the demolisher, dealing 5,400 to 6,600 damage and knocking them back. Also deals 2,850 to 3,150 siege damage to buildings.

• Electroshock: 38 energy, 10 second cooldown, instant. Shocks all targets within a 25 yard cone in front of the caster. It also interrupts spellcasting and prevents any spell in that school from being cast for 4 seconds.

• Steam Rush: 40 Energy, 15 second cooldown, instant. Put the steam engine into overdrive for a short duration, rushing forward, dealing siege damage and knocking back enemies.

Passenger Abilities

• Anti-Air Rocket: 10 energy, 1000 yard range. Instant, 0.25 sec cooldown. Fires an explosive missile directly forward, detonating when it has travelled 100 yards, hitting any enemies within 10 yards.

• Fire Cannon: 20 Energy (Steam Power), 10-70 yard range, Instant. Fires a cannon blast.

• Shield Generator: Activates the shield generator on the Siege Engine, absorbing a limited amount of Physical, Fire, Frost and Arcane damage taken for 5 sec. 1 minute cooldown.

Salvaged Demolisher

This vehicle moves slowly but has ranged attacks and can even catapult its passengers.

It can carry a passenger, who can grapple the pyrites from the ground and loads them one by one as abilities that deplete them are used. The primary use for them is giving 10 charges to the big nuke.

• Hurl Boulder: 10-70 yard range, instant. Hurls a massive boulder into the distance, dealing 13.5k to 16.5k damage to enemies within 8 yards of the target.

• Hurl Pyrite Barrel: 5 Pyrite, 10-70 yard range, instant. Hurls an orb of blue pyrite into the distance, dealing 27k-33k damage, but consumes ammo.

• Ram: 15 yard range, 4 second cooldown, instant. Rams any enemies in front of the demolisher, dealing 8,550 to 9,450 damage and knocking them back. Also deals 2,160 to 4,640 siege damage to buildings.

• Launch Passenger: launches the Demolisher's passenger into the air.

senger Abilities

Cannon: 40 yard range. Instant, 1 second cooldown. Fires an explosive missile directly forward, detonating when it has traveled 50 yards, hitting any enemies within 10 yards.

• Grab Crate: 40 yard range. Instant. Use your hoook and chain to grab the targeted crate.

• Reload Ammo: Loads 20 rounds into the demolisher's ammunition cartridge. Requires Liquid Pyrite.

• Increased Speed: instant. Injects liquid pyrite into the engines, increasing movement speed by 100%. Lasts 20 seconds.

Load into Catapult: instant, 30 second cooldown. Load yourself into the catapult arm, using yourself as ammunition.

Salvaged Chopper

This motorcycle model is very fast and moves very adroitly (it can strafe, for example).

It can carry a passenger.

• Sonic Horn: Instant, 20 energy. Sends a wave of force in front of the motorcycle, causing 3150 to 3850 damage to all enemy targets within 35 yards in a frontal cone.

• Tar: Instant, 15 second cooldown. Drops a pool of tar for 45 seconds that slows the movement speed of enemies wihtin 10 yards. Tar can be ignited. Lasts for 45 seconds

• Speed Boost: Instant, 50 energy. Fires the fuel injectors on the bike, increasing its speed by 100% for 5 seconds. (no cooldown)

• First Aid Kit: Heals the passenger of the Chopper.

 

The Fight, and Setting Your Difficulty

The trash portion of the fight begins when you tell either Brann Bronzebeard or the Lore-Keeper of Norgannon that you're ready. This makes the vehicles usable, although no mobs will attack you until you leave the starting area. If you speak to Brann Bronzebeard, the fight is automatically set to "easy mode." If you talk to the Lore-Keeper of Norgannon, the fight is set to hard mode by default, and destroying individual towers will remove those powers/benefits from the Flame Leviathan fight. At any time, you can see which powers/benefits Flame Leviathan has by looking at the gemstones in his fight area; those that are lit are activated, with green representing Freya, blue Hodir, yellow Thorim, and red Mimiron.

The Gauntlet

Once you are in your vehicles, you leave the entrance and head north. Nothing is likely to kill you as their damage is very low and it's mostly a speed bump. The AE abilities of the Choppers and Demolishers make fast work of the small mobs. There are flying copter mobs that need to be dealt with by anti-air abilities like the Siege Tank passengers' Anti-Air rockets, and gnomish Mechanostriders that have large amounts of HP and fire lasers at the raid.

One thing to note: the Iron Colossus mobs cast Ground Slam. It's a 7-second, interruptable cast, that deals a lot of damage. The Siege engines can interrupt it, or you can outrange it.

As you progress, the Siege Engines and Demolishers should be destroying the towers, since this stops the dwarves from continuing to spawn from that tower. There's no need, however, to clear the entire area unless you want to: any remaining mobs will leave you alone and will not add when you engage Flame Leviathan.

At the end of the gauntlet, on the right, is a repair circle. Run your vehicles over it to get healed to full before you engage the final packs before the boss.

Repair now, because the circle gets blocked off and cannot be used during the boss fight.

In addition stock up on Liquid Pyrite before you pull the last pack: shoot the flying pyrite barrels out of the air and have the Demolishers' passengers use Grab Crate to stock up on five barrels.

The Flame Leviathan

Shortly after the last Iron Colossus dies, Flame Leviathan will come out.

Your motorcycles should drop tar in front of the door and your Demolishers should ignite it so he takes damage immediately (this also makes him activate immediately.)

Siege Engine Tactics

The fight is the Siege Engines kiting him, keeping in front of him with Steam Rush as necessary. If you get too close, he will hit you with Battering Ram, and its debuff stacks.

Every 30 seconds he will switch targets to another siege vehicle, mark them, and follow them around. If you do not have two siege vehicles active then he will pick a different unit.

Use Electroshock to interrupt Flame Jets. It helps reduce the damage done to the Choppers and Demolishers when they're in range. He will cast two jets in between every target switch, so you can use the pattern of "shock shock run" and substantially reduce both raid damage and the risk to yourself.

Chopper Tactics

Work with your Siege Engine drivers to establish a kiting path, and drop Tar in it. This slows him slightly, and also deals significant damage when ignited.

You can use Sonic Horn while Tar is on cooldown to deal additional damage.

You have very low health, so be careful to never get hit by Battering Ram and avoid excess Flame Jets damage.

Demolisher Tactics

Your passenger needs to use Reload Ammo to charge up Hurl Pyrite Barrel, which deals significant damage.

If you are destroying turrets, you will also want to get your passenger up onto Flame Leviathan and then be ready to pick them back up again later.

 

 

 

TIPS:

Please note that it's likely that he will always be killable on easy mode without doing this more than once:

Demolishers can launch their passengers onto the Flame Leviathan. You want to launch both a dps and a healer or hybrids who can heal themselves. Ranged are a better choice than melee.

Once they are there, they need to destroy the turrets, which will make him far more vulnerable to damage and kick them off of Flame Leviathan.

When he's overloaded, all vehicles need to dps him as much as they can. Motorcycles drop Tar under him so it can be lit. The Demolishers need to pelt him with Hurl Pyrite Barrel as well.

This stun also resets his stacks of Gathering Speed.

When the players are ejected from Flame Leviathan, motorcycles need to zip over quickly to pick them up, since they will die quickly otherwise. Then they can get back into the Demolishers again to take out the next round of turrets.

 

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