The mirror appeared one morning in Rarity's home. It was covered in the dust of ages. Traced in the dust, with the tip of somepony's hoof, was a message and a plea.

SET ME FREE

Slightly expanded from an entry in GaPJaxie's My Little Speed Writing Competition, which gives you 60 minutes to write a story based on a prompt chosen by the masses. Join us in the Discord if you're interested in improving your writing skills!