Depiction in the seriesThe Alicorn Amulet is first shown in Magic Duel, when a cloaked pony enters a curio shop and points to the amulet, kept under a glass dome. The storekeeper refuses and warns her of the amulet's dangerous nature, but changes his mind after she puts a large pouch of bits on the table.
The cloaked pony goes to Ponyville wearing the amulet and reveals herself to be Trixie. Her eyes and magic aura glow red under the influence of the amulet. She challenges Twilight Sparkle to a magic duel. Twilight initially refuses, but agrees to the duel after Trixie continues her assault on the town.
During the last stage of the duel, Trixie performs an age spell on Snips and Snails, turning them into a foal and an elderly pony, respectively. Twilight is shocked by this, stating that age spells are "only for the highest level unicorns." Twilight attempts to undo the spell, but her magic fizzles out. Trixie promptly banishes Twilight from Ponyville.
When Twilight goes to the Everfree Forest to practice magic under Zecora's supervision, her friends attempt to find the reason behind Trixie's new magical powers. In Twilight's library, they find a book depicting the Alicorn Amulet. The book says that the Amulet blesses the user with untold powers but corrupts the user the more it is used. The Amulet also cannot be taken off by anypony other than the user.Twilight returns to Ponyville to persuade Trixie to duel a second time, on the basis that Zecora has supplied Twilight with a far more powerful amulet from beyond the Everfree Forest. Trixie performs the age spell again, but becomes unsettled when Twilight seemingly performs the age spell on Applejack and Rarity, a duplication spell on Rainbow Dash, a spell that enables Pinkie Pie to play ten instruments at once, and a gender changing spell on Applejack. Trixie seizes Twilight's amulet and takes off the Alicorn Amulet, believing she can conquer Equestria with her newfound power. Rainbow Dash takes the Alicorn Amulet from her and puts it in a wooden box held by Zecora, saying the Amulet needs to "go into hiding where it belongs." Twilight tells Trixie that her green amulet is just one of Zecora's doorstops.
The Alicorn Amulet is briefly mentioned in No Second Prances.
The Alicorn Amulet appears on page 5 of My Little Pony: Friendship is Magic Issue #22.
- ↑ Twitter / M. A. Larson replying to a query about the origin of the term Alicorn (2012-12-27). Archived locally.