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Water Strike, a free-to-play magic spell, is the weakest water spell in the standard spellbook. It requires one Water rune and one Air rune to cast. The base damage of this spell is 48, and it scales up to 211 at 22 Magic.
This is one of the few attack methods that can damage Salarin the Twisted. When used against him, the spell will either "miss" or deal 100 damage.