Christopher has always been small for his age. He had your typical round nerd glasses in his youth and was bullied often. He could handle the bullying it didn't really bother him. He knew he'd likely live a successful life while they would probably be tasked with menial labor at best. What did get to him was the dark. He slept with a nightlight every night. The only ones who knew was his close friends.
After the incident, no one believed the wild tales he spun about the monster. It didn't take long for his parents to decide moving would be best. He was admitted into extensive therapy for 6 years. He wasn't crazy though just distraught. Eventually he stopped throwing fits when no one believed him and just kept the thoughts to himself. He pretended to get better, and in some ways he did. He wasn't scared of the dark anymore. He was now scared of what may be lurking in said darkness.
Finishing his studies with high marks he graduated early. He quickly moved out of home and took to studying the arcane arts. It was...hard to find anyone that actually took it or him serious but eventually he met one of the Black Robes and was able to join their ranks. He would turn his fear of the dark into a strength and learn to manipulate it to hopefully get back at the monster.
No one believing in his stories he decided to turn them into just that, a novel. It was met with success but due to him getting writers block he was not able to complete the sequel book which lead his fans to lose faith in him. He would publish a few other books but none were as successful as the horror novel that he wrote.