No pony can hold onto their magic forever. Inevitably, a pony's body will be broken, and their magic will return to the air and soil. Celestia has held onto her magic for a very long time.

After many long years of preparation, the time for Twilight to succeed Celestia as Bearer of the Sun has come. But as the abdication ceremony in which Celestia will relinquish her power approaches, Twilight begins to desperately search for a way to stop the dread ritual of the ceremony and save her friend.