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I Choose You, Steelbreaker (25 player)
Defeat the Assembly of Iron with Steelbreaker as the last member alive in 25-player mode.
I Choose You, Steelbreaker (25 player) requires defeating the Assembly of Iron in Ulduar with Steelbreaker killed last, making it the hardest version of the encounter.
Kill Brundir First
Enter Ulduar and engage the Assembly of Iron. Focus all damage on Brundir first, as killing any boss heals the remaining bosses to full and grants them new abilities.
Transition to Runemaster Molgeim
After Brundir dies, switch to Runemaster Molgeim. When Molgeim reaches around 10%, position Steelbreaker next to Molgeim's damage rune and stack the raid on it before finishing Molgeim off.
Burn Steelbreaker Down
Once Molgeim is dead, Steelbreaker gains a stacking 25% damage buff and 15% HP heal per stack, and will apply Overwhelming Power to the current tank, killing that player via Meltdown after 25 seconds. Use Bloodlust or Heroism immediately and have a spare tank ready to take over when the first tank is debuffed.
Manage Static Disruption
Throughout the fight after the first boss dies, Steelbreaker casts Static Disruption, an AoE nature vulnerability debuff, so healers must be prepared to handle increased nature damage across the raid.
Tips
Killing Steelbreaker last also causes him to drop an Archivum Data Disc, which starts the quest chain for the Algalon access key alongside the equivalent drop from Runemaster Molgeim if killed last instead.