Mimiron ( tactics ) Mimiron is an encounter in the Ulduar dungeon . The LMS Mark II leads near his room . The fight consists of four phases , and is a rather healing intensive battle for survival . In each phase , Mimiron uses some vehicle or device . In Phase 1 , he enters the Leviathan MKII , in Phase 2 it ' s the VX - 001 , Phase 3 sports the Aerial Command Unit , and in Phase 4 he enters a composite vehicle consisting of all three previous types together . In each phase , the respective vehicle has to be destroyed , after a short interphase Mimiron enters the next one . On normal mode , Mimiron has a 15 minute berserk timer . 10 - man abilities . V - 07 - TR - 0N . Has combined abilities from previous phases . Strategy . Phase1 : Leviathan MKII . Ranged should spread out around him just outside the circle of mines . Melee other than the tank should group up behind the MKII inside the circle of mines . He will cast plasma blast every 45 seconds . All healing should be on the tank unless someone is likely to die otherwise . Shock blast usually follows closely after plasma blast . The tank should run directly away from the front of the MKII and then reengage along the same vector after the blast , and hopefully face him the same direction . Ranged DPS / Healers who are hit by Napalm Shell do not need to move after being hit . The flame effect is only graphical . Healing on this phase is priority on the main tank , then people hit by Napalm Shell . This phase requires a melee tank . Phase 2 : VX - 001 Anti - personnel Assault Cannon . Ranged can stay at a distance from the boss and everyone should spread out equally around the mimiron , as soon as the mines have despawned ( be careful - sometimes mines appear to despawn but are still active ) . Rapid Burst does minimal damage compared to the other attacks , but that deals damage to all targets in front of VX - 001 . Rocket Strike causes a red target to appear on the ground . People must move out of this target within 3s or they die . Only one rocket is fired each time in Phase 2 . As soon as the dps observes that the VX - 001 casts Spinning Up , everyone must move behind it . Standing in front of P3Wx2 is instant death . During the Laser Barrage melee should stand at the edge of the cannon ' s hit box as meleeing from the center can move you into the laser barrage . Healing in this phase is mostly AoE . This phase is untanked . Phase 3 : Aerial Command Unit . Everyone should move into one third of the room , as marked out by the lines on the floor . The Healers and ranged except for the ranged tank should be in the back middle as far away from the bot spawns as possible . A warrior can use Spell Reflection on the " Plasma Balls " throughout the phase and maintain good threat which will endure into phase 4 . This avoids most of the damage from the Plasma Balls and allows proper allocation of a DPS class . The ranged tank needs to immediately pick up the boss . The melee tank ( s ) should start picking up the smaller bots that start spawning around the room , staying away from and killing the Bomb Bots that the Aerial Command Unit drops . He can be seen casting " Bomb Bots ' when he drops a single bomb bot to the floor below , it will then chase a random player until killed or meeting with that player and exploding . Bomb bots can be slowed . The following macro can be used by DPS , Healers and even Tanks with instant ranged attacks to ease the burden of bomb bots . With the raid as a whole using it bomb bots can be destroyed easily before they reach the raid . Alternatively a plate DPS can stand under the Command Unit and taunt the Bomb Bot as it lands . The bot will move to them and explode . This damage is easily sustainable ( 25 man ) with fire resistance and healers aware of when the bot is incoming . The rest of the raid should stand back from this bomb soak with melee moving in when the Command Unit is grounded . Be aware that if you move in while not on full health you may be caught in the blast of the last bomb dropped before grounding so hold on for a heal before moving in to DPS . No bombs will be dropped during the ground phase . This approach will allow more predictable healing of bomb damage and save DPS time trying to kill it ( as it will kill itself ) . The Deadly Boss Mods addon is very useful during this phase . It will automatically change the loot setting to Free For All during this phase and will return it to its previous setting at the end of the phase . This is so electromagnets can be picked up by melee . They drop off the Assault Bots . Once picked up , this item should be used underneath the Aerial Command . Melee dps should be focusing on the small bots until he is pulled down by the electromagnet . At that point all dps should be on the Aerial Command Unit . Ranged dps should be on the bombs that spawn under the Aerial Command Unit and on the Aerial Command Unit otherwise . Healing on this phase is focused on the range tank and melee tank ( s ) . This phase is range - tanked . Phase 4 : V - 07 - TR - 0N . Each of the previous phase ' s targets have their own health pool and can be targeted separately . All three targetable sections begin this phase at 50 % health . The main tank needs to pick up the MKII the same as in Phase 1 . The ranged tank needs to pick up the Aerial Command Unit the same as in Phase 3 . From what we could tell , there is no threat reset between the phases . The VX - 001 remains untanked . The raid should stand either directly behind or directly in front of the main tank . Ranged should be outside the land mines , Melee should be inside . Due to the timing of the cooldowns on the current live realms , the first and third shock blasts happen very near in time to the P3Wx2 attack from the middle section . It is essential that the tank move away and approach back along a vector that does not pass in front of the VX - 001 . The P3Wx2 seems to start to the side of where the MKII is facing . Everyone should move behind the VX - 001 . 2 Rockets spawn at a time during this phase . They are still a one shot kill . Dps should be split up between the 3 sections . All sections need to die within 10 seconds , else they respawn . Melee cannot reach the aerial command unit . Healing should be split up between the Leviathan ' s damage on the melee tank , the Aerial Command Unit ' s damage to the ranged tank , and the raid damage done by the VX - 001 . The Leviathan will no longer Plasma Blast the melee tank or Napalm the raid , and the VX - 001 will no longer Heat Wave the raid . Firefighter . The Firefighter Hard Mode is initiated by pressing the Big Red Button . This will dramatically change the encounter . All of Mimiron ' s normal abilities will continue . " Note : If your raid members still die with any regularity to Proximity Mines , Shock Blast , Rocket Strike or Laser Barrage DO NOT ATTEMPT THIS HARD MODE . " Firstly all vehicles and bots in the encounter gain 30 % damage and health . Secondly every 30 seconds three patches of flame will spawn near random players ( this makes the spawn locations of the fire controllable ) . These flames hit for 10 , 000 fire damage per second . They will slowly creep towards the nearest player ( this makes the Fire ' s location controllable ) . These flames spawn in all phases and continue spawning between phases . Thirdly the room will self destruct after 10 minutes , putting a new enrage timer on the encounter . Fourthly Mimiron will gain new abilities and a new type of bot in phase 3 : The main difficulty to Firefighter is controlling the fires . You want to stay near existing fires so that fires will overlap and give you more of the room to work with . Most of the room will be covered in flames by the end of phase 3 . If you do not control fires well you will run out of room and burn to death . Always try to stay together and keep the fires overlapping and to the outside edges . Quotes . Sound Files . See " Sound Files of Ulduar : Mimiron " Related achievements . The following achievements are for the encounter ' s hard mode . Videos . 10 - man Hard mode encounter . < youtube > dowAs9Q528U < / youtube >