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Shadow Barrage requires a Magic level of 88 to cast and can reduce your targets' damage dealt by 5% for 10 seconds. It requires five earth runes and two blood runes to cast. The base damage of this spell is 844, and it scales up to 864 at 90 Magic.
When cast as an auto-attack, this spell will strike a 3x3 square area surrounding the target, hitting other players and monsters in this space.