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Disarmed
Destroy both of Kologarn's arms and then Kologarn himself within 12 seconds in Ulduar.
Disarmed requires you to destroy both of Kologarn's arms and then kill Kologarn himself within 12 seconds in Ulduar.
Avoid AoE Attacks
Do not use any AoE attacks during this fight. Single-target only, or you risk damaging Kologarn directly and killing him before the 12-second window begins.
Kill Both Arms First
Single-target Kologarn's left arm and then his right arm. Each arm has around 400, 000 HP, so be conservative with your damage output to avoid accidentally one-shotting Kologarn before the timer starts.
Kill Kologarn Within 12 Seconds
Once both arms are destroyed, immediately switch to Kologarn and kill him within 12 seconds. Kologarn has around 1, 400,000 HP, so if your damage is very high, consider holding back — one player found that auto-attacking only was necessary to avoid killing him too quickly.
Tips
You can complete both Disarmed and the Rubble and Roll achievement in the same fight; the number of times you kill the arms does not affect Rubble and Roll, only the final kill counts.
If your damage is extremely high, test your output on earlier bosses and trash before reaching Kologarn so you can gauge whether you need to hold back or use weaker abilities.