There was only one survivor of the Rain Fall Massacre. An entire pack of Diamond Dogs met a fate of both fire and flood on that day, and the responsibility was taken by the leading council of Cloudsdale and her citizens. Refusing the Royal Sisters' wishes, the city disappeared into the clouds, seceding from Equestria.

Over the next year, the city inexplicably reappeared a number of occasions, each time taking a reconnaissance team with it. Tinker, a unicorn stallion hired by the Royal Guard to find a way to replicate the mysterious non-Unicorn magic demonstrated on that fateful day, lost a friend in the most recent attempt to gather information on the city. Fate takes a strange twist after he comes to terms with the fact that there was no chance to find her when he is abducted from his home. Destination: Cloudsdale. What is revealed to him and others there will shake the skies, and may mean the undoing of Equestria.

This is a Bioshock: Infinite crossover with liberties taken to make this its own story.