After a horrible failure at the Battle of the Bands, Sonata and Aria went back to their apartment while Adagio was plotting for revenge. She cried in rage and escaped to the rooftop of an old building, and saw a happy Sunset Shimmer floating in the air with her fiery phoenix wings. And Adagio thought of a brilliant plan.
Art By Me.
(Does not feature the Main 6 and the Dark tag until later in the series.)