Key Ingredient

The Key Ingredient is one of three ingredients needed to make a Calming Potion for the Great Booga Shark. You can find it in the Temple Treasure Room of Shark Tooth Island, glowing on a pedestal.

Trivia

 * It is unclear what is actually contained inside the Key Ingredient.
 * The other ingredients needed for the Calming Potion, along with the Key Ingredient, are the Old Bone and Carbonated Coconut Milk. This, along with hints of finding the Medicine Man, is carved on the wall of the Temple Treasure Room.