Twilight Sparkle is an expert in unicorn magic, but earth pony magic remains a mystery to her. She's determined to uncover the earth tribe's secrets. What she learns will change her life . . . And it just might change Applejack's life as well.
After Twilight and her friends rediscover Starswirl’s last spell in the ruins of Golden Oaks Library Rainbow Dash asks, ‘why can’t we all become alicorns?’
Suddenly, Applejack becomes a Princess, prompting startling changes across Equestria. Twilight seeks to unravel this mystery... but what will she learn?