1,000 years ago, Celestia ignored her sister's pleas of help to fight the Nightmare. Because of Celestia's carelessness and inability to help the one closest to her, Luna's inner nightmare took control and nearly plunged the world into eternal night. Celestia was able to fight back however and defeated her with the Elements of Harmony, banishing the Nightmare to the moon for 1,000 cycles, along with her sister.

With the royal wedding over and the changelings defeated, the ponies of Equestria are joyous and celebrate victory. Against all odds, Princess Cadence and Prince Armor defeated Chrysalis with the power of love, bringing any doubt of the new couple to an end. Everything's going well, with Canterlot in full swing once more and no problems presenting themselves...correct?

Not quite in Luna's case. The voices are returning, and she turns to Celestia for help once again in 1,000 years. But like before, her sister simply deems it as bad happenings and nothing else, nothing to take action against.

Will the sun goddess come through and help her sister against her own inner darkness, or will history repeat itself with more dire consequences?

Cover art by Silverlinings