Do the people living on Necropolis know about the spirit/demon Tenebrarum, who brought the Rephaim into the world? In one or two missions from the campaign that is included in the book, the Ordo Tenebrarum is explicitly mentioned regarding the so called dark knights. I am wondering: do the people / the church simply know the name that this cult gave itself, or do they actually know about Tenebrarum itself?
I read the whole book, and it does not say anything except that there are many things the church does not know about, like some sort of Rephaim. I also had a look at the 2351-2355 Expansion that is released, which does not clarify.