Life after ruling for Celestia is boring, almost too boring. However, on one of her strolls, she comes across a lost runaway filly. It quickly becomes clear that there is more to the filly than what meets the eye.
In the last story, Cozy Glow became a super hero. Mostly because of brain damage. Now she has to juggle studies, super heroics, friend-making (ugh), and... destiny? All before Hearth's Warming – can't a former megalomaniacal psychopath catch a break?
Castling is a special move in chess where a player’s rook ends up just next to the king. Thanks to a friend’s kindness, a calculating young filly would end up closer to her princess than she ever thought. But can a filly like Cozy Glow be changed?
Instead of defeating the villain trio by combining the power of friendship yet again, Twilight and the others lose in their desperate attempt of victory to save Equestria.
For the first time in a long time, the cutie map summons a particular student of Twilight Sparkle to solve a friendship problem. The problem? Teach three familiar characters the power of friendship. It won’t be easy.
As she prepares to take over for her longtime mentor, Princess Twilight reflects on the tribulations that got her here, and what the Elements of Harmony intend for her to do next.