Ignis the Furnace Master is an optional boss encounter in Ulduar and can be found in the Colossal Forge. On orders from prime designate Loken, Ignis created both Kologarn and Razorscale. Jump to videos.

General abilities

• When he parries, he will not melee faster.
• Activates a construct every 40 seconds in normal, and every 30 seconds in heroic.

10-man abilities

• Scorch - Fires a jet of flame, burning all enemies in front of the caster within 30 yards, dealing 2357 to 2643 Fire damage every half-second for 3 sec. Additionally, the ground is scorched by this effect causing it to catch on fire, dealing 3299 to 3701 Fire damage every second to all enemies within 13 yards. Iron Constructs within this radius will begin to heat up, eventually becoming molten.

• Flame Jets - Stomps the ground causing geysers of flame to erupt under all enemies. These geysers deal 5655 to 6345 Fire damage, knocking the targets into the air and interrupting any spells being cast for 8 sec. In addition, the targets take 1000 Fire damage per second for 8 sec.

• Slag Pot - Charges and grabs a random enemy target, tossing them into the caster's slag pot. The target is unable to attack the caster and takes 3500 Fire damage every second for 10 sec. If the target survives, they are imbued with the magical slag, increasing their haste by 100% for 10 seconds.

• Activate Construct - 3.56M HP. For every second that a construct is in a Scorch area it gains a stacking speed buff. At 10 stacks it will turn Molten. When Molten it will gain extra haste and deal 2357 to 2643 Fire damage to enemies within 7 yards. Running the construct into water while Molten will turn it Brittle, stunning it, increasing its chance to be critically hit, and causing it to shatter if hit for more than 5000 damage in one attack.

• Strength of the Creator - Increases damage done by 20%. One stack of this buff is applied each time an Iron Construct is summoned, and one stack is removed each time a Brittle Iron Construct is shattered.

25-man abilities

• Scorch - Fires a jet of flame, burning all enemies in front of the caster within 30 yards, dealing 3770 to 4230 Fire damage every half-second for 3 sec. Additionally, the ground is scorched by this effect causing it to catch on fire, dealing 3299 to 3701 Fire damage every second to all enemies within 13 yards. Iron Constructs within this radius will begin to heat up, eventually becoming molten.

• Flame Jets - Stomps the ground causing geysers of flame to erupt under all enemies. These geysers deal 8483 to 11198 Fire damage, knocking the targets into the air and interrupting any spells being cast for 8 sec. In addition, the targets take 2598 Fire damage per second for 8 sec.

• Slag Pot - Charges and grabs a random enemy target, tossing them into the caster's slag pot. The target is unable to attack the caster and takes 5000 Fire damage every second for 10 sec. If the target survives, they are imbued with the magical slag, increasing their haste by 100% for 10 seconds.

• Activate Construct - 3.81M HP. For every second that a construct is in a Scorch area it gains a stacking speed buff. At 10 stacks it will turn Molten. When Molten it will gain extra haste and deal 4713 to 5287 Fire damage to enemies within 7 yards. Running the construct into water while Molten will turn it Brittle, stunning it, increasing its chance to be critically hit, and causing it to shatter if hit for more than 5000 damage in one attack.

• Strength of the Creator - Increases damage done by 20%. One stack of this buff is applied each time an Iron Construct is summoned, and one stack is removed each time a Brittle Iron Construct is shattered.

Adds: Iron Constructs

For every Iron Construct (even Molten ones) Ignis activates, he gains one stack of a 20% damage bonus. No more than a couple of these should be kept up at any time.

To kill an Iron Construct, it needs to be stood inside of a Scorch area until it gains 10 stacks of Scorch and becomes Molten. The construct tank can kite it through the scorches over and over, stand in Scorch with the construct and take additional damage, or have DPS keep it in Scorch using Entangling Roots, a pet, or Frost Nova. Once molten, it is stunned for a couple seconds, then drops all threat, has 100% faster move speed, and a powerful AoE fire aura that deals about 7,000 damage every six seconds. After the tank reestablishes threat, the molten construct needs to be dragged immediately to one of the water pools on the sides of the room so it turns Brittle. A brittle Iron Construct is a dark purple color and is stunned for 20 seconds, with a 50% increased chance to be critically hit. It will shatter if 5,000 or more damage is done in a single hit; only ranged DPS should be used to shatter it as an AOE explosion occurs, dealing 20,000 damage in a 10 yard radius. Shattering a construct removes one stack of Ignis' +20% damage buff. A brittle construct will revert to being a normal Iron Construct if not shattered within 20 seconds.

One strategy to deal with constructs dropping aggro when molten is to place the healers into the water so that constructs will head straight for them. This allows the tank to break away from a construct once it becomes Molten and be ready to pick up the next one. Healers must move at least 10 yards away from each construct before it is destroyed in order to avoid the AoE damage.

Shamans are particularly effective for blowing up the constructs since they can produce on-demand crits that deal the requisite 5,000 damage once every six seconds. Molten and Brittle Constructs are not immune to fire, so using a Flame Shock/Lava Burst combination on the Brittle Construct will reliably blow it up.

Death Knights can be very effective at tanking the adds. They can Dark Command or Death Grip when the adds spawn. They can then wait until topped off after a flame jet, pop anti-magic shell, and bring the add into the fire. At ~8 stacks they can cast chains of ice and begin running to the water. When the molten add becomes active they can dark command or death grip the add to the water, and then have a ranged attacker destroy it. Since the add becomes stunned they may also be able to shift to Blood Presence and destroy it themselves, in which case Anti-magic Shell & Icebound Fortitude is best saved for the explosion.