Cosmo is a pony from Canterlot who was adopted by a couple on the night of the Star Festival. One day Cosmo's adoptive parents reveal how they found him and Princess Celestia sends him to Ponyville to make friends. While there he meets a certain Unicorn he hadn't seen in years. Through treacherous dungeons, evil sorcerers, and eldritch abominations, Cosmo will stop at nothing to find his destiny, and the long forgotten secret of the Elements of Harmony.