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Arrested Development
Allow all three of Corla's zealots to evolve, then defeat Corla after slaying the evolved zealots in Blackrock Caverns on Heroic Difficulty.
Arrested Development is a 10-point Heroic difficulty achievement in Blackrock Caverns that requires allowing all three of Corla's zealots to fully evolve before killing the evolved zealots and then Corla herself.
Enter Blackrock Caverns
Enter Blackrock Caverns on Heroic difficulty and clear the adds past Corla down to the next boss, then clear the dragonkin patrol at the top of the ramp leading down.
Let Zealots Evolve
Walk into Corla to engage her, then stand in the middle of Corla and her zealots without interrupting the evolution process until you see the message 'A Twilight Zealot has evolved!' appear three times, once for each zealot.
Kill Zealots Then Corla
Once all three Twilight Zealots have evolved, slay all three evolved zealots first, then defeat Corla to earn the achievement.