Events from the distant past, things Celestia and Luna had hoped long put to rest have resurfaced, and now everything they have worked for may be placed in jeopardy. Despite all their power, the princesses must place the salvation of Equestria within the hooves of the Elements of Harmony if there is any hope to keep the peaceful paradise they have spent the centuries creating. But are Twilight and her friends up to a task that would challenge the might and wisdom of princesses themselves?