One night, Princess Celestia had a very surprising vision concerning the Mane 5. When she, Princess Luna, and Princess Twilight realize the meaning of it, the Mane 5 will have their world changed forever. They learn that their biggest and toughest choices they will soon make will require immense sacrifice of what they knew, dreamed, and worked for. Ultimately, what they choose will not only affect them, but the ponies they care most about and all of Equestria.

Luckily, they have each other to learn how to be strong and willing to choose whatever choice they make in the future. Will they stay the same, or will they have to eventually rise to the occasion, embrace their true destinies, and join together to form the Princesses of Harmony?

This is a prologue to the series "The Alicorn Trials".