While in the process of spring cleaning, Twilight stumbles upon a mysterious book that was discovered during the Legend of the Mirror Pond incident. When curiosity struck, she learns many new legends inside and outside of Equestria. But, half ripped page in the book peaks her curiosity as she learns about an artifact known as the "Porcelain Pony". The cruel mistress of fate, bring her and the artifact together where it soon unlocks a new door of terror.