Mimiron Encounter Guide: Strategy, Abilities, Loot

Mimiron is the fourth and final Keeper you will encounter in Ulduar. He is an engineer responsible for making many machines you have already faced throughout the raid. The Mimiron fight is one of the longest, having 4 phases, and the most difficult. This is especially true when facing the hard mode version of the encounter.

• Melee DPS will always need to be aware of the Proximity Mines around them and have a safe and quick path away from the boss when Shock Blast is being cast.
• Do not greed for damage or "optimal" position if it puts you or other players in danger.
• Ranged DPS should spread out around the whole room, except the front of the boss, to prevent multiple players from being hit by the same attacks.

• Your tank must always have a defensive cooldown available to live through the Plasma Blast. Be sure to coordinate abilities, so something is always available.
• Utilize the whole room, except in front of the boss, to spread out and prevent multiple people from being hit by the same attacks.
• This fight is rather long, especially on hard mode; prioritize mana conservation and regeneration gear to make it through.

• You must always have a defensive cooldown available to survive Plasma Blast. Be sure to use a personal cooldown or get an external one, or you will not live.
• Make sure to face the boss away from the raid quickly, and that melee DPS have room to attack.

• Napalm Shell
• Plasma Blast
• Proximity Mines
• Shock Blast

• Heat Wave
• Spinning Up
• P3Wx2 Laser Barrage
• Rapid Burst
• Rocket Strike

• Plasma Ball

• Assault Bot
• Magnetic Field
• Magnetic Core

• Bomb Bot
• Bomb Bot: Explode

• Junk Bot

• Proximity Mines
• Shock Blast
• Spinning Up
• P3Wx2 Laser Barrage
• Hand Pulse
• Rocket Strike
• Plasma Ball
• Self Repair

• Emergency Mode — All enemies are buffed.
• Flames — Fires break out in the room for the entire encounter.

• Flame Suppression — Periodically floods the room and puts out all fires.

• Frost Bomb

• Emergency Fire Bot
• Deafening Siren
• Water Spray

• Frost Bomb

This fight is very long, having 4 phases and dozens of mechanics to worry about. In phase one, you will be fighting Leviathan Mk II, a machine similar to Flame Leviathan. Have your tank quickly establish threat and face the boss away from the raid. Ranged DPS and healers should spread out around the room while avoiding the boss's face to mitigate the damage from Napalm Shell. This leaves heavy Fire damage over time on players hit, requiring a large amount of healing them to survive. Use a personal defensive cooldown if you are targeted with this fire.

Tanks need to be constantly mindful of the Plasma Blast timer and have a personal or external defensive cooldown ready to survive. Always have a cooldown for the tank and be ready to overheal as much as possible to keep them alive. Leviathan Mk II will also frequently cast Shock Blast, killing all nearby players after 4 seconds. When this cast begins, Melee DPS and tanks must be ready to run away from the boss.

Lastly, Leviathan Mk II will constantly place Proximity Mines around itself, surrounding the melee and tanks. It is vital to avoid activating these mines as it is easy to set off multiple mines, easily leading to player deaths. The melee DPS and tanks must always be aware of when and where these mines have been placed so they can always have a path to get away from the boss when needed.

After defeating Leviathan Mk II, you will now be testing Mimirons VX-001 machine. This boss does not have an aggro table and, therefore, can not be tanked. VX-001s main attack is Rapid Burst, which damages all players in an area with a frontal cone attack. Make sure your ranged DPS and healers are spread throughout the room evenly to prevent too many people from being hit by the same Rapid Burst attack. Melee DPS can run through the boss if it turns to blast the side you are currently standing on.

Everyone will need to watch the ground near them for any red circles, as these indicate where the deadly Rocket Strikes are landing. These are one-shot kills if any player is in the landing area. VX-001 will also constantly use Heat Wave, dealing minor Fire damage to the entire raid and placing serious damage over time debuff on everyone.

While the damage from Heat Wave and Rapid Burst are deadly enough for this phase, there is one more main ability all players will need to be aware of to avoid. VX-001 will begin Spinning Up its guns and face a direction. After a few seconds, it will cast P3Wx2 Laser Barrage, instantly killing anyone remaining in front of it. While channeling the P3Wx2 Laser Barrage, VX-001 will rotate clockwise, requiring players to move similarly to remain behind the boss and avoid the deadly lasers.

The third and final machine you will be testing is the Aerial Command Unit. This machine will fly in the air, out of reach of melee attacks. It does still, however, require a tank to pick it up. Typically you will have a Warlock grab it with Searing Pain to establish a threat lead. This ranged tank will be constantly attacked with Plasma Ball and must be healed to full between each attack.

Constantly throughout this phase, the Aerial Command Unit will call robots to aid it in the fight. Bomb Bots are similar to those on the XT-002 Deconstructor fight, and must be killed by ranged players as they Bomb Bot: Explode when they die, most likely killing anyone nearby. Kite these away from the raid and have ranged DPS prioritize attacking these before returning to the boss.

Junk Bots are, as the name suggests, rather useless. Ignore these and let them die off to natural AoE damage, or wait till a good number of them gather up and quickly AoE them down. The main bot of this phase is the Assault Bot. These hard-hitting melee mobs should be slowed and kited, similar to the Snaplasher from the Freya encounter. Your tank will need to maintain aggro on these while kiting, and the melee DPS will need to quickly kill these without pulling aggro. Use any threat redirections available to help out, and always be mindful of your threat. If the Assault Bot gets too close to the tank, it will root them with Magnetic Field, increasing their damage taken by 30% and preventing them from moving; this must be removed quickly from the tank, or they will certainly die.

Whenever an Assault Bot is defeated, it will drop a Magnetic Core. This core can be used on the Aerial Command Unit to temporarily disable it, forcing it to the ground for 10 seconds and increasing its damage taken by 50% for the duration. This allows your melee DPS to finally attack the boss, giving you a good damage window to finish it off. You will typically want to save up 2 or 3 Magnetic Cores to use them back-to-back and keep the Aerial Command Unit pinned to the ground for a longer period, or used at the same time to stack up the 50% increased damage debuff. Be mindful that Magnetic Cores only last 1 minute, so you do not want to hold onto them for too long, or they will go to waste.

In this phase, Mimiron will call out all 3 of the bosses previously encountered one at a time: Leviathan Mk II, VX-001 and Aerial Command Unit. They will only have half health and not use all of their previous abilities. All 3 bosses must die within 10 seconds of each other, or they will revive again, starting the process all over.

The Leviathan Mk II must be tanked again; however, the deadly Plasma Blast ability is disabled in this phase, as well as the Napalm Shell. It will keep its Proximity Mines and Shock Blast attacks, requiring the melee DPS and tanks always to have a safe way of getting away from the boss when needed.

The VX-001 unit is now attached on top of Leviathan Mk II, following it around for the fight. Its previous Rapid Burst ability is replaced with Hand Pulse, dealing a bit less damage overall. It will also no longer use the Heat Wave ability, greatly reducing the raid damage taken. The raid will still need to be ready to dodge the constant Rocket Strikes; as well as periodically avoiding the P3Wx2 Laser Barrage.

The Aerial Command Unit will sit on top of the VX-001, acting as the "head" unit. You will still need to have a ranged tank; keep aggro on this boss to tank the Plasma Ball attack. However, you will no longer need to deal with the robots constantly spawning.

Mimiron hard mode is started by pressing the Big Red Button at the back of the room that says "DO NOT PUSH THIS BUTTON" on mouse hover. Ignoring this warning and pressing the button will start the encounter with a 10-minute hard enrage timer. All enemies will also receive the Emergency Mode buff, increasing their health and damage dealt. There will also be constant patches of fire spawning throughout the room, making it even more challenging to find a safe spot and avoid the other mechanics.

Mimiron will also use a few new abilities to try and put the fires out in his workshop. Use these abilities to control the fires and help defeat this encounter:

• Flame Suppression — Periodically floods the room and puts out all fires.

• Frost Bomb — Do not stand near these when they land as they will knock back and damage.

• Emergency Fire Bot — Casters need to avoid standing near these to avoid the silence aura.
• Deafening Siren
• Water Spray

• Frost Bomb — Do not stand near these when they land as they will knock back and damage.

Item	Type/Slot
Helm of the Wayward Conqueror	Tier Token
Helm of the Wayward Protector	Tier Token
Helm of the Wayward Vanquisher	Tier Token
Shoulderguards of Assimilation	Leather Shoulder
Stylish Power Cape	Back
Static Charge Handwraps	Cloth Hands
Cable of the Metrognome	Plate Waist
Pulse Baton	Main Hand Mace

Item	Type/Slot
Mimiron's Flight Goggles	Leather Head
Fused Alloy Legplates	Plate Legs
Tempered Mercury Greaves	Mail Feet
Greaves of the Iron Army	Plate Feet
Fusion Blade	Main Hand Sword

Item	Type/Slot
Malleable Steelweave Mantle	Leather Shoulder
Asimov's Drape	Back
Gauntlets of the Wayward Conqueror	Tier Token
Gauntlets of the Wayward Protector	Tier Token
Gauntlets of the Wayward Vanquisher	Tier Token
Waistguard of the Creator	Leather Waist
Pandora's Plea	Trinket
Insanity's Grip	Main Hand Fist
Delirium's Touch	Off Hand Fist
Fragment of Val'anyr	Val'anyr, Hammer of Ancient Kings

Item	Type/Slot
Crown of Luminescence	Cloth Head
Titanskin Cloak	Back
Armbands of Bedlam	Plate Wrist
Conductive Seal	Finger
Starshard Edge	Main Hand Dagger

Mimiron is just one of the 14 encounters present in the Ulduar raid of Wrath of the Lich King Classic. If you would like to learn more about the other fights and their respective loot, please see our Ulduar Raid Hub page below.