Twilight Sparkle is Equestria's newest alicorn princess. She has tremendous new power, a castle, her own kingdom, and all seems right in the world.

But it is not to last. A mysterious stranger appears in Ponyville, and with the power of a black crystal, steals Twilight's magic from her: her alicorn power, her rainbow power, and even her normal unicorn magic is stripped away. Her friends vow to help her get her powers back, but with seemingly no way to restore it on her own, can Twilight cope with the possibility of being forced to live the rest of her life without her magic?

For what is a unicorn, without her magic?