Half a year before the Wedding of Princess Cadance and Shining Armor, Princess Luna's enigmatic Night Guard is in full recruiting season, taking in five new recruits; A snarky yet troubled young mare, a cool and collected stallion, an overbearing zealot, a former criminal, and an undercover assassin.

As darkness settles over Equestria, there is more than the Changeling threat looming for them. However, when Riding Rain (Pronounced "Reddling" Rain in the Equestrian language) learns that Changelings could wipe out Equestria, he sets aside his duties to assassinate Equestrian royalty and begins rallies with Princess Luna's Night Guard to face one of the greatest threats that Equestria has ever had to endure.

Original long Description:
In the wake of Princess Luna's return, new recruits are sought for the Night Guard. While most recruits quickly begin to enjoy their new beginning, an assassin from the south quickly finds their psyche to be completely overwhelmed. However, when Equestria is forced to face the threat of an unknown enemy that threatens to consume the entire nation, the assassin must quickly shift gears to defend the princesses marked for death to defend their home. With terror gripping Equestria; Nightshade, Midnight Tales, Tops, 'Bruiser', and Reddling Rain discover old legends and curses that they must overcome in order to give the Mane Six a fighting chance against those who would harm Equestria.