Plasmarine is the Boss of Jabu-Jabu's Belly, the seventh Dungeon in Oracle of Ages.
Plasmarine is a jellyfish-like creature that is battled in an underwater room, where Link is unable to attack using his Sword. Plasmarine is susceptible to the Long Hook and will alternate between its blue form and its red form each time Link uses the item on it. Plasmarine's method of attack is to swim quickly to Link's location, stopping briefly to either shoot an electric ball toward him, or try to electrocute him on the spot. The electric ball produced is always the same color as the Boss's present form; Link must use the Long Hook to both displace the Boss and switch its color, so that it gets hit by its own attack. As Plasmarine takes damage, it will begin to fire more electric balls in succession. After taking enough damage, it will be defeated, leaving behind a Heart Container and opening the door to the Rolling Sea.
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