Ulduar: Mimiron Boss Strategy Guide - World of Warcraft

General Information

Mimiron is the 8th Ulduar Boss. He is a multi-boss fight, read: You fight several bosses. In every phase, you fight one different appearance of Mimiron.

• Leviathan MKII: ~6.900.000 Health Points (1.740.000 HP on Normal)
• VX-001: ~6,900,000 Health Points (1.740.000 HP on Normal)
• Aerial Command Unit: ~4,700,000 Health Points (1.600.000 HP on Normal)
• Assault Bot
• Bomb Bot
• Trash Bot
• V0-L7R-0N (MKII) 3,450,000 HP (870,000 HP on normal)
• V0-L7R-0N (VX-001) 3,450,000 HP (870,000 HP on normal)
• V0-L7R-0N (ACU) 2,300,000 HP (800,000 HP on normal)
  
  

As last, you have to beat all of the 3 previous forms once again, at the same time (with 50% of their original health). That’s basically 18.500.000 Health Points (3.340.000 HP on normal) for the units plus half that in his Phase 4 to 27.750.000 Health Points to beat him completely.

Abilities (Phase 1-3)

Leviathan MKII

• Proximity Mines: Drops about 10 mines next to the Leviathan, walking over them will make them explode for 20,000 fire damage.
• Napalm Shell: Fires a shell filled with napalm at a random enemy target. The shell explodes upon impact, dealing 7540 to 8460 Fire damage instantly and an additional 32000 over 8 sec. This effect attempts to target enemies over 15 yards away if possible.
• Plasma Blast: A stream of plasma errupts from the cannon, dealing 30000 Spellfire damage per second for 6 sec. This effect cannot be resisted. 100 yd range, 3 sec cast / Channeled, 7 sec cooldown
• Shock Blast: Deals 100000 Nature damage to all enemies within 15 yards. 4 sec cast
• Rocket Strike: Launches a rocket towards a random enemy. Once the rocket reaches the destination, it deals 5000000 Fire damage to all enemies within 3 yards.

VX-001

• Rapid Burst: Unleashes a series of short plasma bursts towards a random enemy, dealing 1885 to 2115 Spellfire damage per burst for a total of 6 bursts over 3 sec.
• P3Wx2 Laser Barrage: Spins up the dual cannons for 4 sec before unleashing a spray of lasers in a random direction, dealing 20000 Spellfire damage every 0.25 sec to all enemies caught inside. Lasts 10 sec. (This is a rotating beam using the same mechanics as C'thun Eye Beam or Lurker Below Spout)
• Rocket Strike: Launches a rocket towards a random enemy. Once the rocket reaches the destination, it deals 5000000 Fire damage to all enemies within 3 yards.
• Heat Wave: Fires out a blast of heat, dealing 1885 to 2115 Fire damage instantly and an additional 10000 Fire damage over 5 sec to all enemies.

Aerial Command Unit

• Plasma Ball: Builds up a ball of plasma and fires it at a target, dealing 14138 to 15862 Spellfire damage. 30 yd range, 2 sec cast
• Add - Assault Bot: Uses Magnetic Field - Projects a magnetic field towards the target, locking them in place. In addition, the target will take an extra 30% damage from all sources. Lasts 6 sec. 30 yd range. They drop a Magnetic Core when they die, Deploying this magnet under the Aerial Command Unit will temporarily bring it to the ground and disable it. While it remains disabled, it will take an additional 50% damage from all sources.
• Add - Bomb Bot: These bots will walk through the raid for a moment and eventually explode for 9425 to 10575 fire damage in a 5 yards radius, run away from them!
• Add - Junk Bot: Very weak adds, just DPS them down.

Abilities (Phase 4)

Leviathan MKII

• Shock Blast: Deals 100000 Nature damage to all enemies within 15 yards. 4 sec cast
• Proximity Mines: Drops about 10 mines next to the Leviathan, walking over them will make them explode for 20,000 fire damage.

VX-001

• Hand Pulse: Fires a pulse of energy towards a random enemy, causing 6598 to 7402 Spellfire damage to all enemies in a cone facing the target enemy. 50000 yd range, 0.85 sec cast
• P3Wx2 Laser Barrage: Spins up the dual cannons for 4 sec before unleashing a spray of lasers in a random direction, dealing 20000 Spellfire damage every 0.25 sec to all enemies caught inside. Lasts 10 sec. (This is a rotating beam using the same mechanics as C'thun Eye Beam or Lurker Below Spout)
• Rocket Strike: Launches a rocket towards a random enemy. Once the rocket reaches the destination, it deals 5000000 Fire damage to all enemies within 3 yards.

Aerial Command Unit

• Plasma Ball: Builds up a ball of plasma and fires it at a target, dealing 14138 to 15862 Spellfire damage. 30 yd range, 2 sec cast

Achievements

Heroic

• Heroic: Set Up Us the Bomb - Defeat Mimiron without anyone in the raid being hit by the following on Heroic Difficulty.
• Heroic: Not-So-Friendly Fire - Force Mimiron to kill a Assault Bot with a Rocket Strike on Heroic Difficulty.
• Heroic: Firefighter - Defeat Mimiron after activating his Self-Destruct mechanism on Heroic Difficulty.

Normal

• Set Up Us the Bomb - Defeat Mimiron without anyone in the raid being hit by the following on Normal Difficulty.
• Not-So-Friendly Fire - Force Mimiron to kill a Assault Bot with a Rocket Strike on Normal Difficulty.
• Firefighter - Defeat Mimiron after activating his Self-Destruct mechanism on Normal Difficulty.

The Encounter

There are 4 phases. In the first 3 Phases you fight Mimiron in his vehicles. In the last phase, all 3 vehicles will join together to a single enemy (but still all 3 previous vehicles are targetable) called V0-L7R-0N. Just like in Transformers!

The goal: Kill all 3 parts of Mimiron at the same time (or very close to each other)

Tactic and Setup

Phase 1 (Leviathan MKII)

Standard spank and tank fight. Best way to do him is to tank him in the middle of the room and have the damage dealers spread around him.

One think to take care is, that the ranged damage dealers are at least 15 yards away from each other to prevent Shock Blast hitting more than 1 person. From time to time some mines will spawn. Simply ignore them/avoid them and don’t waste your time disarming them.

Phase 2 (VX-001 Antipersonnel Assault Cannon)

In this phase your raid has to spread out and fill out the whole room. It’s important that the healers are placed good so they can heal everyone and that there are no players out of range of their healers.

You also have to watch out for the rockets. The rockets are targeting an area on the ground. However, you don’t see a mark on the ground. So if you see a rocket flying in your direction: MOVE OUT! 5-10 yards is enough, the AoE range is quite low!

Sometimes he may also use P3Wx2 Laser Barrage. He will start spinning. When this happens, move behind the boss, to avoid the damage from this attack.

Update: Currently there seems to be a little bug/exploit you can use, to cancel P3Wx2 Laser Barrage. However, it doesn't work always. The trick is, if he target's someone (he will look in that's persons direction) and prepare for P3Wx2 Laser Barrage, you can do Feign Death, Invisible, Vanish, Shadowmeld and similar Skills, which will cause them to cancel the attack. Also if he targets temporary NPCs (like Shadowfiend, Elemental etc) with it and they die before the preparation is done, the attack will be canceled too.

Phase 3 (Aerial Command Unit)

Requirements: Ranged Tank and someone to kite him

An soul-link warlock would be perfect for this task. Let him build up some agro before the ranged damage dealers start attacking. Good measure is to wait until the first adds were spawned.

The adds spawn randomly inside the room and are marked by a spotlight. The color of the spotlight indicate which mob will spawn there.

Orange = Assault Bot

Orange bots need to be kited by an ranged damage dealer (Hunters and Mage are good for it). Mage is much more preferred in this case, with specced frost bolt so he can keep him slowed down without assistance of others. Once the person who kite him has enough agro, open fire and shoot it down. 

It's very important to focus him down as soon as possible (before next one spawns). Don't root him, as this can cause the Assault Bots to attack your melees. The Assaults Bot immoblizing spell (prevents his current target from moving, is channeled and lasts 4 seconds) can be interrupted, kicked, dispelled etc. If nothing ready, use Deathknights Freeze skill to slow him down.

Update: There are also some other ways to avoid/remove his channeled "root" skill. For example Feign Death, Cloak of Shadows, Vanish. Problably works with PvP Trinket and Invisible too. Remind this, as it can save your (or your raidmates) life and for this encounter, you need every piece of damage dealer and healer.

Green = Junk Bot or Bomb Bot

This is the task for the “regular” tanks. You only need to tank the Junk Bots. The Bomb bots will just run around and blow up after a while and make sure that you don’t get hit by the explosion!

Update: Seems like the Bomb bots doesn't explode by themselves. But there is a very nice tactic on how to avoid your raid to be blow up by them. Usually there should only one Bomb bot active. So all you need to is to slow it down or root it (i.e. roots from Druid, Frostnova from Mage or with Hunter traps) and wait until the damage on the raid/tanks is moderately. Then have a tank move to the Bomb bot and taunt/hit it (be sure that before you let the bomb explode, no one other than the tank is in it's explosion raidus).

This way only the tank takes damage and all others can concentrate on the Boss/Assault Bots. If done correctly, there won't me much damage on the raid as Assault Bots only do melee damage and 1 hit everything that's to close. So only damage is on the Warlock tank and the tank who tanks the Junk Bots.

After the Assault bot dies, it will drop an magnetic core. This core has to be used below the boss. It will get him down to the ground and your melee damage dealers can finally hit the boss. It lasts only 6 seconds, so make sure to blow up your cooldowns at that moment, to shorten the phase as much as possible. One reason to blow up the cooldowns there is, that the damage is increased while he’s on the ground.

You have to time this phse correctly. Best pot to trigger it, when the Assault Bot is down (if you lack on DPS, do it when the Assault Bot is at 10% or so). Another good tip is, if you trigger this, let your ranged dps do a few hits on him (DoTs or some instants like Explosive Shot) for some extra damage and then fire at the Assault Bot again.

Note: It’s helpful to set the loot to Free-For-All, so everyone can loot the core and speed up the process (same as the core with Lady Vahsj in Serpentshrine Caverns).

Repeat this steps, until the boss is down.

Phase 4 (V0-L7R-0N)

In this phase, the boss turns all the previous “mini-bosses” into one big mecha: V0-L7R-0N (Transformers inc!). The 3 V0-L7R-0N components will have half the Health Points they had in the phases 1-3.

One thing to notice is, that in this phase no adds will be spawned.

• The Aerial Combat Unit from Phase 3 still needs to be tanked by the ranged tank (the Soulink-Warlock is still the best choice).
• The Leviathan MKII has to be tanked too by a tank (preferably the one who tanked him in Phase 1 too)
• V0-L7R-0N will cast P3Wx2 Laser Barrage more often than in Phase 2
• Avoid the rockets (same as Phase 2 too)
• You have to avoid the mines

This alone sounds easy, but the trick is to kill all 3 components at the same time, otherwise they will repair themselves. So in order to achieve this, do damage to all parts until they are somewhere close to 5-6% and then split the damage dealers in your raid.

Let the Melees focus on the Leviathan MKII and the VX-001, while the ranged damage dealers focus on the Aerial Combat Unit.

Most cooldowns should be ready again. Once all are at 5-6%, start damage them equally and fire up the cooldowns (which should be ready again, at least some of the shorter ones). It’s unlikely the fight will last long enough to use Heroism for a second time.

Hard Mode

Hard Mode is quite similar to the normal way to beat him. To start the Hard Mode, you have to press a red switch on the back side of the room to start the “emergency mode”. The boss will get 25% more Health Points and deal 25% more damage.

Additional to that, you have to beat him in less than 8 minutes!