In Equestria, legend tells of a pony, all the colors of the rainbow, who will grant the wish of a pony whose heart is true. But tread lightly—the Rainbow Pony will grant a wish only if the wisher completes a unique task.
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.
The Reapers are invading Equestria, intent upon destroying and enslaving the upstart ponies before they can affect the rest of the cycle. Unfortunately for them, Luna stands in their way.