Stranded in Equestria's far past in the body of a unicorn without any magical knowledge, the self proclaimed "Weiss Noir" fights for survival in the Frozen North by indulging in sorcery most foul.
Humanity's space exploration ultimately took the form of billions of identical probes, capable of building anything (including astronauts themselves) upon arrival at their destinations. One lands in Equestria. Things go downhill from there.
Twilight wakes up one morning to discover, after accidentally turning off the sun and almost burning Ponyville to the ground, that she has the power to alter reality on a whim. Will she learn to control herself? Or will she destroy Equestria trying?