Done the instance twice, solo, and had the icon above skills saying I could still get achievement, but as the boss was defeated both times it has instantly gone away without rewarding achievement. Will edit with more information if requested.
For this achievement, you have to allow 3 menders to get to the statue and buff/heal it. After it gets buffed 3 times, the statue will use its Power Strike attack, which is essentially the Molten Berserker’s shockwave attack. Just dodge/jump over it, then proceed to kill the statue afterwards. Have fun doing it a 3rd time.
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