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The Hataclysm
Ask Brann to change his hat ten times after recovering it from the Underpin during the War Within Season 2.
The Hataclysm requires you to ask Brann Bronzebeard to change his hat ten times after recovering it from The Underpin in the Demolition Dome delve during War Within Season 2.
Pick Up the Quest
Before entering the Demolition Dome delve, pick up the quest for defeating The Underpin — completing the kill without the quest active may not credit the requirement.
Defeat The Underpin
Complete the Demolition Dome delve and defeat The Underpin. You must complete it on the standard difficulty first — skipping straight to the harder difficulty will not unlock the hat-swapping dialogue with Brann.
Also Complete Standard Difficulty
If you completed only the harder difficulty and Brann's dialogue option is missing in Dornogal, return to the Demolition Dome and clear it on the standard difficulty as well — both must be completed.
Swap Brann's Hat Ten Times
Speak to Brann Bronzebeard in Dornogal and select the hat-change dialogue option. Cycle through his hats ten times in a single uninterrupted dialogue session — do not close or leave the dialogue before reaching ten swaps or the progress will be lost.
Tips
Do not exit the dialogue at any point during the ten hat swaps — closing the window resets your progress toward the achievement.