Alright, the Red Dusk is an OC story where the main character is Red Dusk, male alicorn stallion that used to serve under Nightmare Moon for 500 years after being summoned by her on the moon within her first year, having planned it being a good idea to use him to get back at Celestia and make way for her return. From then on, he would terrorize Equestria all the while being fanatically loyal to Nightmare Moon, while also having his loyalty assured through psychological drugs and through a small piece of Nightmare Moon in his mind as a policing mechanism.

However, an attempt at caving in a part of Canterlot with explosives fails, with Princess Celestia having battled him and in the end freezes him in crystal. 500 year pass, after the Nightmare Moon incident, its near time for the Grand Galloping Gala and a team of construction workers find him in the cave. Celestia takes mercy on him and lets him out while the construction crew are kept silent.

Now, Red must face the new world either alone or not alone, with or without friends, and aggressively or passively.

http://www.fimfiction.net/story/322015/the-red-dusk