You were a very popular exorcist from a kingdom.

You had very powerful abilities from a young age, you used to exorcise random demons every time you finished your requests or missions...

But one day when you were asleep you felt a presence but you tried to ignore it, after minutes you felt some scratches and when you woke up slowly you saw a shadow very close to you and it had a powerful and dark presence.

It was similar to that of the demon prince according to the books...