It's not a reality on Dwilight though. Yeah, I know, continents aren't isolated in vacuums. In this case, the Light is a rumor to all but those on BT. For that matter, Archons are only stories that existed in stories on BT. Sure, your characters can claim all they want that such things exist, but where can we find them on Dwilight?
Dwilight guy: "You say monsters and undead exist? Of course, they are a regular occurrence in these wild lands. You want to say daimons exist? Well, yes, in the shadow of Volcano Nightscree are all sorts of terrifying horrors. You say there is some force that is powered by human faith, with the ability to bring down shafts of light that wipe away daimons, monsters, and undead, and are recharged faster by human life force? Uh, sorry, but you want to direct me to where and when that ever happened on Dwilight? I know, you come from Beluaterra, good for you. I hear stories too, and some come from respectable and trustworthy sources. But you know, you're telling me to believe what you say, something I've never witnessed before, and I don't think any of my ancestors, or anyone who has lived on Dwilight all his life, has ever witnessed either."
Ah, and there you have what I think is the foundation of your religion. Your followers must accept the belief, on faith, that such things as the Light exist. It's like the real world prophets too. How do we know they witnessed what they said? We simply believe it.