Reality is a kaleidoscope, each time you look into it and give it a little spin you'll see some new haunting pattern or possibility that will shock or amaze you. One choice, or one tweak, to a little moment can cause a new moment to fracture and change everything. Then those changes can branch out to create more and more and more. It's a never ending tunnel of 'what if' and chance.

Something from beyond the kaleidoscope has invaded this sacred fractal and is looking for something, something to do with Twilight Sparkle. It leaves a trail of destruction in its wake and it seems near unstoppable at every point.

Somepony has to notice and stop this, before all of reality is cleansed of Twilight Sparkle and this stranger finds what they're looking for.