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Can't Do That While Stunned (25 player)
Defeat the Assembly of Iron without allowing Stormcaller Brundir to damage anyone with Chain Lightning or Lightning Whirl in 25-player mode.
Can't Do That While Stunned (25 player) requires defeating the Assembly of Iron in 25-player mode without letting Stormcaller Brundir deal damage with Chain Lightning or Lightning Whirl.
Understand Brundir's Abilities
Stormcaller Brundir casts Chain Lightning with a 1-second cast time and channels Lightning Whirl once another boss has died. Both must be fully prevented — not a single cast or channel can deal damage to anyone.
Kill Brundir First
Killing Stormcaller Brundir first ensures he never has the opportunity to cast Lightning Whirl (which only becomes available after one boss dies) and reduces the total time you must keep him stunned or interrupted. Be aware that killing Brundir first forces Runemaster Molgeim or Steelbreaker to be the final boss, both of which are considered hard-mode encounters.
Stun and Interrupt Brundir
Brundir can be stunned and his spells interrupted by other means throughout the fight. The 1-second cast time on Chain Lightning makes interrupting it manually difficult, so combining stuns with interrupts is the most reliable way to prevent any cast from completing.