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.
- Always Someone Better:
- According to the Villain Song, everyone in the Isles saw Azurine and her Crystal magic as superior to Prisma's, flocking to her for it. Angered by being left out, Prisma acted out.
- Amber admits that she feels like Sofia is a better heroine than her. Luckily, Sofia helps her sister realize how heroic she'd been in the past.
- 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".
- Sofia tells Amber about the heroic deeds she'd performed in previous episodes:
- Saving James and Roland from the Jade Jaguar in "Princesses to the Rescue!"
- Going after Miranda upon believing she'd been taken by a sealien in "Her Royal Spyness"
- Fixing Clio and Hildegard's friendship in "Sidekick Clio"
- Chekhov's Gun: Amber finds a gem on the Isle of Dancing Deserts on the way to the Isle of Crystals. This powerful stone comes in handy in destroying Prisma's Terra Crystal and restoring the magic.
- Foreshadowing: When Orion shows up, Prisma uses her cloak to hide her appearance from him. This foreshadows that she is the Crystalmaster that the protectors are looking for, and Prisma is evil and lying to the duo.
- Noodle Incident: Prisma says that Amber's amulet has more magic than Sofia's, but we never got to see what other powers it had before all the former's magic was gone.
- 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.
- You Are Better Than You Think You Are: When Amber sings how she feels inferior to Sofia, the latter reminds the former of all the good deeds she's performed before.
