The idea?
A dark entity born of darkness and breached the materium, powers to terrify and annihilate its prey. This being has no intent other then the thrill of the hunt. It is nearly invisible and almost impossible to notice without looking. It feeds on flesh and fear alike, living to terrify the masses. It bring shadow and death with it as it hunts. A dark hunter with no mercy, forgiveness, or emotion other then thrill, This creature will kill you where you stand and where you are. Nothing is truly safe, everything is prey
This creature hunts with plague, the undead its screen, its means to hunt. The undead are its tools and smoke. The darkness its weapon, with fear the blade.