Not sure if i am doing this right first time in these forums. I've been writing fanfics [mostly the same one ] for about 3 or 4 years now. The largest of which is the three Stories in Stone books. The premise came up before season 3 and is about what happened to cause the rise of Nightmare Moon. Granted as close as i followed the actual show it all became alternate universe after that as a lot of my head canon was shot down. Any way, here's the summery and link to the first part. It would be easier to simply check my name in Fim Fiction for everything in the end though. The order of the books however is Stories in Stone; Luna's Royal Guard, SiS; Memories of Twilight , and currently SiS; Lost Empire. There are a number of side stories and spin offs i've written as well as a prequel though all of those are works in progress. If you do start to read this make sure you have some free time, the first book is over half a million words and it's still under revision.
Twilight discovers the true purpose for the Canterlot Royal gardens, much to Princess Celestia's annoyance. Knowing her student will seek answers with or without her permission, the Princess gives Twilight a new subject to study, the story of five of the garden's occupants, their connection to Nightmare Moon, and the dark days of the War of Night. http://www.fimfiction.net/story/1918/stories-in-stone-lunas-royal-guard