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The Lost Hero
- Khione goes beyond merely unpleasant after The Reveal.
- Leo killing his mother. On accident, of course, but try telling that to the cops and his mother's family.
The Son of Neptune
- The description of the last moment's of Hazel's first life, as oil fills her lungs and the chamber collapses.
The Mark of Athena
- The things Nico went through in Tartarus are implied to be too horrible to say.
- The description of Nico when he's freed. Half dead, horribly thin, using his sword for support, and likely traumatized.
- Arachne, full stop.
- Annabeth stepping on and surrounded by the skeletons of all her siblings who died failing to complete the Mark of Athena's quest.
The House of Hades
- Tartarus. All of it. Especially since it's not just a place, but literally the body of the god Tartarus. Nightmare Fuel with a good dose of Nausea Fuel.
- That is not the worst of it, as Tartarus is not a God but a one of the "first-born" from Chaos, he is not a god but literally the personification of what they represent, while the land of Tartarus is his real body.
- There's also the descriptions of Tartarus, such as Percy and Annabeth breathing poison, drinking fire, and the little fact that the ground appears to be made of SKIN.
- The arai are some of the creepiest monsters in the series. They look like harpies, with the bodies of birds and the faces of old wrinkled women, but with the addition of some serious Uncanny Valley in that they have even more monstrous features, their faces don't move when they talk, and the voices that communicate for them all seem to come from some sort of hive like chorus completely independent of the creatures themselves. Yet even that isn't the creepiest part, as they are also the literal embodiment of curses. Meaning if you destroy one you get inflicted with a curse by someone you once wronged or did harm to, hoping that you one day feel the same pain as they did. This, horrifyingly enough, also includes monsters, and Percy and Annabeth have killed a lot of monsters. In their cases, Annabeth goes blind from Polyphemus cursing her after their encounter in The Sea of Monsters, and Percy experiences the wound that killed Geryon when he faced him in The Battle of The Labyrinth. The worst one however would have to be where Annabeth kills an ara and receives a curse made by Calypso to never be with Percy again, and she's left stumbling around blind and alone as she believes he's left her. This has Percy dawn on the horrible realization of how bitter Calypso must have been after he left her, and how even though he made the gods vow to free her, he never followed up on their promise.
- Tartarus is so terrifying that Percy literally drops his sword. Heck, he took out two Titans while creating a semi-physical form (which is not his real form; it's a Fighting a Shadow-type form)! Now imagine what happens when Gaia (a.k.a Earth) wakes up... "Pray she never fully awake" indeed.
- Cupid. Just Cupid. He wastes no time proving that Love Hurts, and that he revels in. First, he curb stomps Jason, the latter only scoring a glancing blow on Cupid's intangible form. The abuse only stops when Nico submits to Cupid's "test". The god promptly psychologically breaks him, apparently for the hell of it, before giving them what they seek.
- Cupid: [They] have met my counterpart, Thanatos. We are not so different. Except Death is sometimes kinder.
- While choking on poison, Percy remembers that poison is still liquid... something he can control. Cue to him nearly choking Misery with her own fumes, while his form still had the appearance of a decrepit zombie-ghost-thing. On top of that, he reverts to his traditional method of fighting at the brink of death-turning his terror into anger that fuels him for combat. He promptly churns every ounce of misery and turmoil she was heaping upon them back towards her in a dark rage. It's no wonder even Annabeth was terrified of him at that moment.
The Blood Of Olympus
- Nico outright kills a guy by turning him into a ghost and banishing him to the underworld. Needless to say, Reyna and Coach Hedge were thoroughly unnerved by this.
Nico: You're already dead. You're a ghost with no tongue, no memory. You won't be sharing any secrets.Bryce: No! No, I am Bryce Lawrence! I'm alive!Nico: Who are you?
- No, it's worse. He erases his identity, his memories, his personality and banishes him to a fields of asphodel forever. Don't pretend that you weren't completely terrified by this.
- Nico stops Will Solace from telling Octavian that he's snagged in the catapult. Mike Kahale then defends Octavian and tells him to fire the shot. After he's launched skyward to his death, it's revealed Kahale knew what would happen. In-Universe example as well, as Nico spends the next half a chapter worrying about Solace's reaction to what he saw.
Kahale: Goodbye, Octavian.
- The Guy's Sanity Slippage wasn't that pleasant to see either. What's worse than regular Octavian? unhinged Octavian, acting Roman commander.