Series about a demon hunter in which your fears manifest into real monsters.

[Ddodge]

So the main character is a demon/monster hunter. Also possibly some kind of law enforcement agent, part of a religious organization. In this world, a different planet if I recall, there is a “force” that can cause your thoughts and fears to manifest into reality. If you’re afraid of a monster in the dark, the monster will manifest. Our hero strives to be fearless so he won’t manifest any more demons. Anything you worry about can happen. I read this series of thick paperbacks in high school in the early 2000’s. I borrowed them from the school library. There were at least 3, maybe 4. In the second book our hero needed help from an ancient demon who had been imprisoned for ages. He was a “demon” yet he was a man and seemed to have good intentions.

 

[hitmouse]

@mods please move to book search.

 

[The Judge]

@Ddodge -- can't help you with the book, but I've moved the thread to Book Search as hitmouse suggested as that's where we keep the knowledgeable members who might be able to find the series for you.