In the future of Equestria, Celestia and Luna continue to live their immortal lives, even though Twilight became an Alicorn that has not given her immortality same with Cadence and Shining armor.They mourn the deaths of the ponies but there is nothing they can do. Celestia has beliefs that Nightmare Moon will return and there will be no stopping her and Celestia does not want to live 1000 years lonesome again. Chaos reigns and a war starts between the Solar and the Lunar empires. Nightmare moon has returned.