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.

End of the Line

Triggers the Flowrider effect after using an Elemental Skill, dealing <span style="color: #99FFFFFF;">80%/100%/120%/140%/160%</span> 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.

Paimonbird

End of the Line