500 years have passed since the awful reason for Fluttershy’s suffering was finally revealed to her, and after a devastating series of events which all but put an end to equine society, Equestria has finally stabilised under the benevolent rule of Princess Twilight Sparkle.

But when an apocalyptic external incident threatens to undo all that Twilight and Fluttershy have worked towards, an old friend of Fluttershy’s arrives to pose a terrible question and an impossible choice, the answer to which perhaps found in an unspeakable past rooted in agonising guilt and profound despair.