It has been a long time since Discord has been defeated and the Realm of Equestria knows true peace. With everything going well in order and Celestia finally having adjusted to being the face of the royalty, Luna finds herselfs spiralling further and further into madness. Only the stars and the moon above appreciate what she does and what she sacrifices for her subjects and the whispering in her head drives her away from the ponies she once loved.
Luna goes for a nightly flight around Canterlot
Luna turns into Nightmare Moon