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: Eleanor's stepmother may have crossed it at the beginning of Phoenix and Ashes, but she is definitely over the line when you realize she would be happy to subject her stepdaughter to magical and psychological torture for days in order to drive her insane and retain control of the estate.
If torturing her stepdaughter into madness isn't enough of a swan-dive over the event horizon, Eleanor's stepmother unleashes a plague—implied to be the 1918 Spanish influenza pandemic—just to prolong World War One so she can reap more corrupted power from all of the death and conflict. She also drains the life almost entirely out of her own two daughters during the final confrontation. It becomes difficult to think of anything this woman does that isn't an affront to human decency.
Richard Whitestone, in Unnatural Issue, turns to necromancy to get his dead wife back, and is willing to destroy his daughter's soul in order to put Rebecca's soul into her body. That's sick and twisted to begin with. Then he uses an army of zombies to savagely attack the household that shelters Susanne when she runs away, and slaughters his faithful old house servants—the people who raised his daughter, as well as stood by him for twenty years while he turned into a complete shut-in. It's hard not to start cheering when he finally gets what's coming to him.
Lady Cordelia in The Wizard of London gains power, influence, and wealth... by murdering small children, binding their souls to a dream world, and sending the ghosts to whisper suggestions into people's dreams. Then she starts experimenting on them to transfer her soul to another body.