AU.In an industrial Equestria, 10 years after the end of S1, 36 year old Rainbow Dash is diagnosed with cutie mark rot syndrome, from years of not being able to fly, and soon, begins to suffer. She teams up with Twilight to make illegally produced artificial rainbows, but the materials required to make it are expensive, so they start selling. They involuntarily start an empire, just as the worst drought of the century comes in to effect.