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Firefighter (25 player)
Defeat Mimiron after activating his Self-Destruct mechanism in 25-player mode.
Firefighter (25 player) requires defeating Mimiron in Ulduar after pressing the 'DO NOT PUSH' button before the fight, activating his Self-Destruct mechanism and triggering a hard mode with an 8-minute enrage timer.
Press the Red Button
Before engaging Mimiron, press the large red 'DO NOT PUSH' button to activate his Self-Destruct mechanism. This applies the Emergency Mode buff to all of Mimiron's vehicles, increasing their damage and health by 25-30%, and starts an 8-minute countdown — Mimiron must be defeated before the timer expires or the raid is wiped.
Survive Phase 1 Doomfire
During Phase 1, Mimiron spawns 2 or 3 patches of Doomfire on random players — these patches move toward the nearest player every 3-4 seconds, so raiders must continuously reposition to avoid letting fire stack up in high-traffic areas.
Handle Phase 2 Hazards
In Phase 2, Doomfire patches continue to spawn and spread. Mimiron periodically throws an Ice Bomb at a random location, which detonates after a few seconds, deals around 8, 000 damage, knocks back any players hit, and extinguishes nearby fire — raiders can use the Ice Bomb's landing zone to clear fire.
Defeat Mimiron Within Timer
Continue through all phases and defeat Mimiron before the 8-minute Self-Destruct timer runs out. Bringing a Fire Extinguisher is recommended to help manage fire patches throughout the encounter.
Tips
See the video guide for a full visual walkthrough of the fight phases and fire management strategies.