Hidden within the shadows of Equestria lies a cloaked figure. The puppet master, the corruption—he goes by many names. The reason, you may ask? Lord Obscuror is the true villain. He is incredibly patient and has gone millennium without being caught, corrupting the many villains of Equestria, but now he is in search of a new apprentice.

After hearing a prophecy, Lord Obscuror, hides himself among the happy habitants of Ponyville. He watches the Elements bearers closely, detailing every weakness and vulnerability...

Inspired by Void Streak's Shadow Wars series, while it won't follow that exact storyline, it will contain elements, I highly recommend it, so that you understand the different aspects https://www.fimfiction.net/story/551406/the-shadow-wars-rise-of-nightwing

Disclaimer: Void Streak is my brother irl and allowed me to use different aspects from his story.