Edit: thanks to , the model has been updated with better wings and an improved horn texture.

One day in the Equestrian institute of terrible ideas, The scientests working there created a special gas made from King Sombra's horn, the blood of a manticore, and Celestia knows how many Adam Sandler movies. unfortunately, one of the workers transporting a case of the gas slipped and broke one of them, the fumes going into a vent which led to a containment chamber filled with changelings. The rest, needless to say, is history.

inspired by this work of art made by this guy