King Sombra, ruler, and tyrant of the crystal empire, despoiler of Equestria, his name has been cursed a thousand times and after Luna and Celestia Defeated him 1000 years ago his name has been struck from the records all knowledge of his previous life destroyed.
Who was King Sombra, and why does the year of his rise to power and subsequent defeat coincide with Princess Luna's fall from grace?
Prequel to Nightingale
Do not need to read Nightingale to understand Somber