The Dazzlings started this battle, and now they were intent on ending it. But in order for them to seize Equestria and the human world, they'd have to go through their final opponents: The Rainbooms.
The stage was set, the final battle was nigh, and the two musicians were ready for the duel that would decide the fate of both the worlds.
[DISCLAIMER]: This ending is not affiliated with the actual film. It goes down a little differently in the actual movie itself, this was just how I saw it ending before I saw Rainbow Rocks itself. I hope you enjoyed my interpretation of it.