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He will periodically emote, “Unatu chooses one of you…” followed by “Unatu pulls back to shatter <playername>!” – the named will directly target that person. That person is supposed to move 10m-20m away in order to take less damage, 5 seconds later he will cast Stoneshatter on the named player and the tank will need to be ready to snap back. You can all stay in, death saves and intercepts to stop the named person dying.