These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Moral Event Horizon: To everyone, Bakker crossed the line by killing those against him. For Matthew, he crossed it when he burnt his own sister and left her crazy.
Nightmare Fuel: Especially given the number of Eldritch Abomination types Matthew deals with, there's a lot. The Last Train will swallow you if you don't bring "offerings"; Blackout will erase the city from the outside in, and once you sleep with it around you can't wake up ever again; and the Death of Cities will skin you alive with paper cuts.