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I Choose You, Stormcaller Brundir (10 player)
Defeat the Assembly of Iron with Stormcaller Brundir as the last member alive in 10-player mode.
I Choose You, Stormcaller Brundir (10-player) is an Assembly of Iron achievement earned by ensuring Stormcaller Brundir is the last of the three bosses alive when the encounter ends.
Enter the Raid
Enter Ulduar and locate the Assembly of Iron encounter. The fight involves three bosses: Stormcaller Brundir, Steelbreaker, and Runemaster Molgeim.
Kill Steelbreaker First
Focus damage on Steelbreaker and kill him first. Killing a boss Supercharges the remaining bosses, healing them to full and increasing their damage and abilities, so be prepared for Brundir to gain new abilities as each boss dies.
Kill Runemaster Molgeim Second
After Steelbreaker is dead, switch focus to Runemaster Molgeim and kill him. At this point Brundir gains the ability to channel Lightning Whirl, shooting bolts at random targets every second.
Defeat Stormcaller Brundir Last
Once both other bosses are dead, Brundir can no longer be taunted and will cast Lightning Tendris, lifting himself into the air as he follows a player while dealing AoE damage. Brundir still uses Chain Lightning (interruptible) and Overload (uninterruptible), so interrupt Chain Lightning whenever possible. Defeat Brundir to complete the achievement.