You are my happiness

King Sombra and Princess Flurryheart are blessed with a beautiful daughter named Galaxia. Named after the angelic queen Galaxia, that once gave Princess Flurryheart the strength to defeat Lord Shen, after she risked her own life to save the wicked shadow King. King Sombra, after she lost him. He was magically brought back to life from the love she felt for him, and together they both changed who they once were. King Sombra is no longer the horrid shadow pony, but the proud husband to the love of his life.

Yes, life has been going very well lately. Until one of the royal pony sisters jealous rage comes back and transforms Princess Luna back to Nightmare moon. Bringing her loyal subjects with her, her most faithful bat ponies who stand by her side to protect her. A new bat pony recruit is chosen by the guards parents to serve Nightmare moon. Nightshade is uncertain if he wants to rule below Nightmare moon's demands, until he meets the new young princess of love.

Will Shining Armour and Princess Cadence approve the support Princess Flurryheart and King Sombra have given Galaxia? Or will they try to control their grand daughter the way they tried to control Flurryheart when she became friends with King Sombra?

Will she be enough to change Nightmare moon's mind and restore Nightmare moon back to Princess Luna? Or will the whole living world of Equestria be due for eternal darkness.