Celestia sends Twilight her last, greatest assignment. The lost masterpiece of Star Swirl the Bearded!
The spell that the greatest mage of all time couldn't figure out.
The spell given to her by the mare who thought releasing Discord was a good idea.
The spell that, upon closer inspection, seems about as stable as Rarity's emotional state and as safe as Rainbow Dash's usual workout.
... Maybe Twilight should double check with the princess first.
Winner of the Rage Reviews F*CK THIS PROMPT 6 contest. Prompt: "Equestria is getting a new Alicorn Princess."