How to use the Shark Fin in Path of Exile 2

Finding a use for the Shark Fin in Path of Exile 2's Act 4 might be a little challenging considering how few clues you're given to its purpose. It's a little similar to the Golden Idol or Sacrificial Heart in Act 3, where you find them and have to then work out their use, but this one is perhaps trickier considering the Tribal Medicine quest NPC's location actually changes based on your progress...
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