Fallout Equestria: Project Horizons/Nightmare Fuel

"PLAY."
 * The top floors of the Fluttershy Medical Center.

"Rampage: You want fear? Fear is being strapped to a table as a permanent lunch for a bunch of cannibals. Knowing they’re going to rip you apart and eat you over… and over… and over again. Fear is knowing you might spend years or centuries that way, your flesh fueling the nightmare and you helpless to stop it."
 * Blackjack gets a first-hand view of how the Enclave mark dashites. Their cutie marks are burnt away by chemicals strong enough to produce smoke, and the fresh wounds are then immediately branded. Worse, this happens to, who is completely loyal but being set up for political reasons.
 * Enervation. It's completely undetectable, except through its effects, and even minor exposure is enough to degrade healing supplies over time. More serious exposure results in internal bleeding, and existing wounds worsen rapidly. At high concentrations, victims suffer from Mind Rape and melt.
 * Enervation is practically alicorn kryptonite. They percieve it as a constant psychic screaming which breaks down their Hive Mind. Only Lacunae is resistant (but not immune) to its effects, and even the Goddess is tormented by it. When Lacunae is briefly exposed to an Enervation source at close range, all of Unity is injured by it.
 * Stable 90 was registered as complete and ready for habitation, despite having none of the essential fixtures or equipment installed. When the bombs fell, the residents were trapped inside, descending into barbarism and dying off completely in under a month.
 * Chapter 22 is rife with nightmare fuel. The first thing Blackjack sees is, and it only gets worse from there.
 * Rampage being chained down and Eaten Alive. She's clearly traumatised, even though she 'dies' every other chapter.


 * All of final scene of Chapter 26, especially, and   reaction to it.

"'Glory': It doesn't have to be dark. is... terrifying."
 * Chapter 30, where the taint building up in Blackjack's body causes a tumor to grow in her eye socket, forcing Glory to perform emergency surgery and get it out.
 * Horizon Labs' cryo room, where a number of ponies have been melted and fused with the walls and equipment, screaming. On some level, they're conscious of what they used to be.
 * Blackjack's various nightmares, particularly the one in Chapter 33.
 * Chapter 33 begins with a disclaimer warning readers of a particularly brutal scene. Said scene involves
 * Blackjack's encounter with pink cloud results in a fair degree of Facial Horror, including a self-inflicted Glasgow Grin after her mouth is fused shut. Illustrated here. (NSFW, bloody)
 * The visual representation of.
 * The visual representation of.