Kalhuiki Door Guardian

Kalhuiki Door Guardians are two NPCs found outside the in the Jungle of the Crystal Hollows. When bringing a to either Door Guardian, the door to the Jungle Temple will open, allowing access to the parkour inside, and the Amethyst Crystal.

Trivia

 * This is the only way to claim the Amethyst Crystal. It is possible to complete the parkour by breaking into the temple, but the crystal will be locked.