The immortal sisters, Celestia and Luna, have a secret. A secret far bigger than anypony could've imagined.

A surplus of irregular activity has surfaced in Equestria, effecting both the holders on the Elements of Harmony, and the natural elements of their country. Twilight and her friends have been entrusted with the mission of finding out and stopping the source of this activity. But, when the source turns out to be three ponies which hold an important part in the immortal sisters' hearts, things only get worse.

Now, the six friends will face trials like no other - trials of love, hardship, trust and most of all - friendship.