When Celestia banished Nightmare Moon, she didn't go alone, but with her loyal army. Now they're trapped in an alien environment, with tensions high and the air running out. If they don't work together, their princess will soon be alone after all.
Since The Dazzlings agreed to be motivational speakers at CHS they're no longer living in a van down by the river, but the job may make them wish they still were.
Princess Luna, and Nightmare Moon was saved by the Elements of Harmony. Now Nightmare moon is her own pony a filly just a year old, when the Changelings attack Canterlot. Nightshade has only one thing to say to them... "MINE!"
In another universe, Luna has been restored thanks to the Elements of Harmony. She wasn't alone, with her appeared a small 2-month-old royal purple alicorn filly. Nightmare Moon reborn as Luna's Daughter. These are short stories in that universe.