To me, this is more aligned with movies like Seven, which thematically kind of hint at a deeper evil, but don't go there, even if the central villain kind of takes that role--- or Fraility, kind of a forgotten 2002 horror/serial killer/demonic thriller, or, like a mutual favorite, The X Files --in which the means of tracking the killer are all real, no superheroes, no special powers, and most of the killers methods are in the realm of plausible but with one part of supernatural. Toombs, The Pusher, that kind of shyt.
In Fraility, everything is real, with one key exception, but the movie essentially unfolds as a legit thriller.