Equestria. Over a thousand years ago, it was a land of peace and prosperity. Two princesses ruled the land, their great power enough to stave off enemies.

But it was not to be; for the elder banished the younger to the moon, and the younger was killed by the elder.

1000 years later, in the floating city of Aster, the unicorn known as Twilight Sparkle runs into a mysterious mare with a yellow coat. Little does she know it, but this will be a turning point in her life.