Assembly of Iron

The Assembly of Iron (or the Iron Council) is the fifth boss encounter in Ulduar found in The Assembly of Iron. The encounter consists of Steelbreaker, Runemaster Molgeim, and Stormcaller Brundir. Killing any one of the three will give a soft enrage of +25% damage to the other two and grant them additional abilities (similar to Fathom-Lord Karathress). Killing the second of the trio will grant the last with a final stage apart from their usual abilities which must be dealt with in different tactics.

The hard mode of this fight requires players to kill Steelbreaker last.

Bosstiary
''The iron armies are led by three fearsome generals, each representing a different race. These leaders are known as Stormcaller Brundir, Runemaster Molgeim, and Steelbreaker.''

Adventure Guide
''The iron legions of Loken are commanded by three fearsome generals, each representing a different titan-forged race. Stormcaller Brundir, Runemaster Molgeim, and the giant Steelbreaker fight in the name of the keeper's true master, the malevolent Yogg-Saron.''

Overview
Defeating a member of the Assembly of Iron will heal the remaining two to full health and grant them Supercharge, which increases damage and grants access to additional abilities.

[[file:Dps_icon.png]] Damage Dealers

 * Avoid damaging Runemaster Molgeim while he has Shield of Runes.
 * Standing in a Rune of Power will increase damage dealt.
 * Avoid Stormcaller Brundir to minimize damage taken from Overload and Lightning Tendrils.

[[file:Healer_icon.png]] Healers

 * Avoid Stormcaller Brundir to minimize damage taken from Overload and Lightning Tendrils.

[[file:Tank_icon.png]] Tanks

 * Fusion Punch inflicts heavy Nature damage.

Abilities

 * Stormcaller Brundir


 * Runemaster Molgeim


 * Steelbreaker

Hard Mode
Defeating one of the Assembly of Iron buffs the remaining members with Supercharge. Steelbreaker is the most difficult member of the Iron Assembly if he is the last member of the Assembly standing.



Phase 1: All three alive
Players can choose to kill the trio in any order they wish, though the popular and easiest route is Steelbreaker, then Molgeim, then Brundir. Be warned that when you kill a boss, the remaining bosses will return to full health. This prevents the raid from being able to take down multiple bosses at the same time.

Just like Maulgar, Illidari Council, Karathress, etc. all of these bosses have to be pulled and tanked away from each other in precise positions. Molgeim and Steelbreaker can be tanked in the two front corners of the room, but Brundir must be tanked towards the back for his Overload (30 yards) which will deal a lot of damage to anyone that is not a tank (often times killing them). Note that Brundir's tank can simply eat the Overloads, since the tank should have a dedicated healer, otherwise only doing raid healing. If it is an issue, the tank should move away as well, then move right back to Brundir when the channeled cast is over. Any casters and the tank on Stormcaller Brundir that can interrupt should be interrupting Chain Lightnings whenever possible. The healer assigned to Brundir's tank should be close to Steelbreaker's back when the fight begins, 35+ yards away.

Molgeim will often put a Rune of Power underneath either Steelbreaker or Brundir so they must be pulled out of the rune far enough to where they're no longer benefiting from the buff and melee or ranged players can bunch up in this rune and output higher damage upon the primary target.

Steelbreaker on occasion will deal a Fusion Punch which the tank must call out for focused healing and a magic dispel of the nature debuff that is inflicted from the punch. Use either a Paladin's Cleanse, a Priest's Dispel Magic, or a Warlock can use their Fel Hunter pet and use Devour Magic on the tank. If you are killing Steelbreaker first, melee must bunch up to benefit from Circle of Healing, Chain Heal and Wild Growth used to counter the nature aura damage.

Phase 2: One Boss Dead
When one of the Iron Council dies, the other two will gain additional abilities. For the most part, they will be tanked in the same general areas but these new abilities will compensate for the dead boss.

Steelbreaker will gain Static Disruption which will cause a random raid member not in melee to take 75% more nature damage for 20 seconds. The whole raid will need to be spread out as this is an aoe and will be extremely irritating to heal through if it hits more than one player.

Molgeim now has a Rune of Death, which will be cast on a random raid member. It is a big, green rune that is impossible to visually miss. Melee and ranged must bunch up and be ready to move in the same general path to avoid confusion, splitting up, and getting out of range of heals.

Brundir will gain Lightning Whirl, which animates like whirlwind and will shoot random lightning bolts at raid members which will deal a large amount of nature damage to random raid members. It can, and should, be interrupted.

Phase 3: Two bosses dead
When two of the three bosses are dead, the last one will separate into a unique phase different from their usual abilities in the previous phases. Players must be alert during this phase because elements are introduced that will almost instantly wipe the group if they don't coordinate around them.

Steelbreaker
Blow Bloodlust/Heroism and hit Steelbreaker with an almost impossible amount of DPS to kill him before you run out of tanks due to Meltdown. The DPS and healing requirements of this achievement are extremely high so it is not recommended for most groups.

Runemaster Molgeim
Molgeim will open up a Rune of Summoning (purple void zone spawn akin to the voidwalkers in TBC) which will spawn lightning elemental adds which will explode for a high amount of damage to anyone within 30 yards when they reach their aggro target. They spawn one at a time, but up to 8 or 9 adds total will be spawned rapidly. They are tauntable and will race after the random players, but they can be taunted by tanks for an emergency target switch. Improved Blizzard and Earthbind Totem DO work on the lightning elementals. All players should move as far from the zone as possible, dropping AoEs in prep for the add arrivals. All AoE helps, however every effort should be made to avoid meeting the adds in melee. If an add bolts free of the AoE, targeted members should run while ranged helps dps down the loose add. Good communication and proper reaction to the add spawns is essential. Also to note, while not necessarily safe, melee dps can help kill the adds as long as one is not chasing them, although it is preferred to let ranged dps take down the spawns.

Stormcaller Brundir
Brundir will lift up into the air and gain Lightning Tendrils. Anybody within a 10 yd range of Brundir will get hit by these tendrils for high nature damage; standing near him for more than a couple of seconds will prove fatal if you are not a tank. He is tauntable, but will clear aggro every time he lifts up into the air, and taunting during Lightning Tendrils will not change his target or course. Occasionally he will fall to the ground and melee can move in to attack, but he will lift again without warning and hit them with his tendrils.

Drops
The Archivum Data Disc / Archivum Data Disc (heroic) also drops if runemaster Molgeim is killed last.

Related achievements


The following achievements are for the encounter's hard mode.

Steelbreaker

 * Aggro
 * yell


 * Special
 * yell


 * Killing a player
 * yell
 * yell


 * Berserk
 * yell


 * Death
 * yell
 * yell

Runemaster Molgeim

 * Aggro
 * yell


 * Rune of Death
 * yell


 * Summon adds
 * yell


 * Killing a player
 * yell
 * yell


 * Berserk
 * yell


 * Death
 * yell
 * yell

Stormcaller Brundir

 * Aggro
 * yell


 * Special
 * yell


 * Taking flight
 * yell


 * Killing a player
 * yell
 * yell


 * Berserk
 * yell


 * Death
 * yell
 * yell

Sound Files
See Sound Files of Ulduar: Assembly of Iron