This story is a sequel to Light of Day
The curse of Nightmare Moon was defeated when Twilight Sparkle and her friends successfully freed Princess Luna from its vicious grasp.
However, an encounter with corrupted magic draws Luna's dark past out once more and this time it will do whatever it takes to stay free, even forming an unlikely alliance...
A fanmade series finale to Friendship is Magic.
Cover image credits: Daybreaker, Nightmare Moon, Celestia and Luna, Twilight, background