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: Obscurio crossed this when he had Oneiron and Incubion drain Magmion - his most unconditionally loyal servant - of his power and abandoned him.
Nightmare Fuel: What the Winds of Darkness can do to you is... quite unsettling: the victim's eyes go blank and their pupils are substituted with live flames, which obstruct their vision more and more, until their eyes are simply glowing embers. It's... disquieting to see.