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With Open Arms (10 player)
Defeat Kologarn without destroying either of his arms in 10-player mode.
With Open Arms (10 player) requires defeating Kologarn in 10-player mode without destroying either of his two arms.
Avoid All Arm Damage
Enter Ulduar and focus all damage exclusively on Kologarn himself — do not attack either arm at any point during the fight. Avoid any abilities that hit multiple targets, as the arms are fragile and can die to incidental AoE damage alone.
Handle Gripped Players Carefully
When Kologarn grips players, avoid freeing them by damaging the arm. At high gear levels you should see no more than three grips before Kologarn dies, so the safest approach is to simply let gripped players die rather than risk killing an arm with splash damage.
Use Cooldowns on Pull
Use Heroism or Bloodlust on the pull and burn Kologarn down as fast as possible. The fewer grips that occur, the less risk there is of accidentally killing an arm through incidental AoE.
Tips
If a gripped player must be saved, battle resurrection effects can be used on them after they die, which avoids any need to damage the arm at all.