This seems to be a now-extinct fish. Its body is sufficiently elastic that a string may be attached to it to let it serve as a bow.
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Triggers the Flowrider effect after using an Elemental Skill, dealing {0} ATK as AoE DMG upon hitting an opponent with an attack. Flowrider will be removed after 15s or after causing 3 instances of AoE DMG. Only 1 instance of AoE DMG can be caused every 2s in this way. Flowrider can be triggered once every 12s.