@Background Pony #82C5
After hearing from Spike about his neglectance and abuse from Twilight and her friends, Starlight brings this to Celestia and Luna, telling them that she is willing to become Spike's new caretaker, as she has treated Spike better than they had. Because of her kindness and purity, she becomes a true alicorn, not like any of the Equestrian alicorns.
After revealing this to Twilight and her friends, Starlight quits as Twilight's student and, based on Spike's wishes, plans to move out of Equestria with him to a new place.
Starlight and Spike travel until they find an empire of dozens of floating islands called Cosmic Jewel, ruled by Queen Galaxia.