From the Journal of Kostrzyn Lubartów, Wanderer of the Black Woods:

hough there are many foul creatures that haunt our world, occasionally an individual horror becomes something more than a passing threat to locals. Whether it is by supernatural power or sheer unholy will, they become universally feared by the folk who encounter them. They are elevated from "mere" nocturnal superstitions to the stuff of local nightmares for generations to come. Strangely, some of these black souls seem to possess power over the land itself...