Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Nightmare Fuel: The Originals
Marcel's methods of punishment, burying other vampires alive in stone, were they starve and desicate.
The reason why Davina is in hiding, her coven holds a ritual that require the murder of their own children for power. The children are led like lambs to the slaughter into a graveyard where they are butchered by their families. When Davina panics and pleas for her mother, all her mother does is look away with an icy stare. Thanks to Marcel, she was saved, but the witches are still looking for her. Gets scarrier when you realize that the witches think they are in the right.
Made even scarrier, in this troper's opinion, when we realize the Harvest actually works, which means the witches have no reason to think they are not in the right.
The curse on Hayley's family is almost the polar opposite of the usual werewolf curse - they are stuck in their wolf form except on days and nights with a full moon.
The fact there is a city where vampires are in charge, where in Mystic Falls vampires are on the fringes of society. In the French Quarter they feed off tourists with impunity, they can hold trial over a witch in public and execute her, leaving her body in the open without fear of reprisal. When the sun goes down, they own the night.
Rebekah's werewolf venom-induced hallucinations while Genevieve has her trapped in an old sanitorium. Visions that plague her include but are not limited to: an old man throwing up blood and glaring menacingly at her, a partially decapitated woman, and twins that might as well be the brothers of those little girls from The Shining that make the most godawful scream. And that's not even the worst of it! The most horrifying being in that hospital for Rebekah is Klaus, after he learns that she'd used Genevieve to summon Mikael to New Orleans to kill him. He stalks her through the hospital, Papa Tunde's knife in hand, roaring her name with fury as she tries to get away...
We finally get to see what happened on the day Mikael came to New Orleans to kill his children. First, he'd physically attacked Elijah and kidnapped Marcel. Then he breaks Klaus in the middle of a crowded opera house by telling him that he will make sure his memory is forgotten long after he's killed the 'abomination' he thinks Klaus is. The crowning moment comes when the show is about to start, and the stage is filled with the impaled and crucified bodies of Marcel and the people Klaus had just made peace with. And then the audience started laughing. Mikael had compelled the human audience to laugh at the horror and think it was just the best thing ever. And after the Originals had fled, he burned down the opera house. With all those people still inside.
And considering what we know about compulsion, who's to say that those people weren't aware of what was going on, but were unable to do anything but laugh while Mikael burned them all?
The hex that the witches placed on Cami's twin brother, and now on her uncle, Paster O'Connell. We get to see the effects of the hex over time. Kieran is aware that his control is gradually slipping away, that one minute he could be fine and the next he could go on a massacre, starting with his own niece. Worst of all, there's no way of reversing the hex once it's been cast.
With the Other Side falling apart, Mikael can affect the land of the living. The first thing he does is torment his sons (and presumably Rebekah, wherever she is) in their dreams. Then he steps it up by almost strangling Hayley to death while she herself is nearly dying from Monique's voodoo attack. And now he's enlisted Davina's help to bring him back to life.
Hayley's screams of horror and fury and helplessness as she's taken by the witches. She's gone into premature labour, and as she's struggling through the pain, she's told that the witches are going to sacrifice her baby to their ancestors.
Just as bad is Klaus' own roar of fury as he searches for Hayley and his child and hears her screaming. When he gets back to full strength, there will be a reckoning.
Esther Mikaelson is still gunning for her children, and it was her decree to kill Hope. It can be argued that her children deserve to die for the horrors they've each wrought since they were turned, but a little newborn baby? Her own granddaughter whose own fate hasn't been set in stone? And now, like Mikael, she's escaped from supernatural purgatory, determined to finish what she started.