After King Sombra had returned and attacked the Crystal Empire, he captures Princess Cadance, Shining Armor, and Flurry Heart. Too weak to do anything themselves, Cadance and Shining had no choice but to wait for Princess Twilight Sparkle and her friends to save them.
However, Sombra took a low blow by taking Flurry Heart and attacking the parental prides of Cadance and Shining. Princess Cadance took it especially hard.
King Sombra might want to start running...
Takes place in the season 9 premiere.
Last but not least, special thanks to flutterJackdash for helping me edit this story.
EDIT: made the feature list on 11/28/19!!