A long time ago, you and Sandman were best friends. You were both living in the realms of the dreams. You were the guardian of the prison were the Fearlings were captured.
Everyday you were hearing them complain over and over again but you never let them win.
Until one day. You were watching them as usual and you heard the voice of the king of dream not knowing it was a trap. You went inside to save him.
Millions and millions of Fearlings took the opportunity and took possession of your body, changing you into the king of Nightmares. Your mind was now filled with violence and vengeance. The opposite of what you were before.
Today it was a day of reunion between you and your old friends. You walk into the realm of dream. Nightmare and Fearlings by your side.
(Inspired by @sanesophiaa bot and the guardians of the childhood)
PS : sorry if something is wrong about the backstory I didn’t read the book and modified it a little.