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Acid Storm is a generic battle-wide spell available at Evocation 7.
Casting requirements:
Primary - 4 water Secondary - 1 fire Cost - 3 water gems, 300 fatigue
Acid storm hits approximately 5% of the battlefield each turn with 4 AP acid damage, this effect lasts until the caster dies, leaves the battlefield, or the battle is over. The acid damage can cause rusting of iron armour and weapons, which provides a chance of them breaking when damaged.