After a dare gone awry, Crystal Clarity—the daughter of Spike and Rarity—loses one of her horns, as well as her ability to use magic and spit fire. Will it grow back before anypony finds out? Or is she sentenced to life as a one-horned freak?
Over 30 years have passed since Discords reformation. But it seems he hasn't entirely escaped is villainous past as an old creation of his comes back to tear his new found family asunder.