The superior leviathan ring is a level 85 piece of jewellery from the Eastern Lands, unlocked through player-owned ports. Its name refers to the Leviathan, a dangerous sea monster. It has a unique ability: a 5% chance per attack to reduce the incoming damage of an attack by 50% (rounded up).
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Steam Community :: Guide :: RuneScape Combat Progression: Boss list, weapons and armour guide.
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Superior leviathan ring, RuneScape Wiki
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Superior leviathan ring - The RuneScape Wiki