Sounds

Sound #15991 (possibly named "Netherpowerimpact") doesn't exist. It may have been removed from the game.
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NetherPowerImpact - Live
NetherPowerImpact - PTR
NetherPowerImpact - PTR 2
NetherPowerImpact - Wrath of the Lich King
NetherPowerImpact - Cataclysm