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A Leuko is a large jellyfish-like enemy found in the Sea and the Sunken Ship in Super Mario RPG: Legend of the Seven Stars. It is an enemy with fairly high HP, and is immune to Thunder-Based attacks and knows 3 attacks - Bolt, Static E!, and Solidify. A stronger version, called Muckle, is found later in Nimbus Land's castle during Valentina's reign.
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