Summary: When Amber discovers that her sister Sofia has a secret job as a Storykeeper, she demands to join her on her latest assignment: traveling to the Mystic Isles and stop the rogue Crystalmaster Prisma from covering the isle with crystals and stealing their magic.
Tropes in this special include:
- An Aesop: The needs of someone else must come before your own.
- Call-Back: Amber's re-discovery of the amulet's magic makes this special bring to mind the events of "The Curse of Princess Ivy".
- The Reveal: Sofia reveals the universe that the show is set in is called the EverRealm.
- Secret Keeper: Amber after discovering the secret passage to the Secret Library, she demands Sofia to come clean about her amulet after years hiding her powers.
- Story Arc: This marks the finale of the "Secret Library" arc, and the beginning of the "Mystic Isles" arc for the remainder of the season.
- Wham Episode: Sofia is set to become a protector of the EverRealm.