Nightmare Fuel / Fate/Zero

As nightmare-inducing as Fate/stay night is, there are reasons why Fate/Zero is considered Darker and Edgier—and considering the writer, Darker and Edgier indeed.

  • Joy to the world, the anime adaption gives us a very nice animated look at what Zouken put Sakura through when she was a child. It's absolutely, utterly horrifying and disgusting. If you don't have a fear of bugs and (specifically) worms, you will after this scene. Zouken, you will burn in hell for this...
    • Even worse when you realize that Zouken has been doing this to children, his own children, his children's children, etc, for centuries. Every generation, a child of the Matou family is subjected to exactly what happened to Sakura, but for Sakura, it was 'only' a decade. The others lived out their entire lives under Zouken's cruel penis-with-teeth worm fingers. And he had to learn his craft from someone, right? How old is the Matou family? Much too old.
  • Again from the anime, Ryunosuke Uryu and Caster's introduction is full of nightmare-inducing images. It doesn't help that both of them are immoral and insane.
  • Sola torturing Kayneth might not be as extreme as all the other examples mentioned here, but boy is it both creepy and nightmarish.
    • Probably because there are no Eldritch Abominations, serial killers, no cruel spells beings cast, or other supernatural aspects, just a paralyzed man who's lost his reason for existence (his magic), failing his family, being emotionally manipulated—and then, when it doesn't work, physically mutilated with the threat of being reduced to a limbless husk—by the one person he cares for.
  • Oh, and Caster's lab. Oh gods, Caster's lab. Think Kirei's basement from Fate/stay night, just with a lot more blood and a lot less purpose. It consists of the still alive bodies of men, women, and children carved up and turned into instruments, artwork, and furniture. The animated version was forced to tone this down because of broadcast standards.
  • Episode 10 has a very Slasher Movie feel. Ryunosuke being the villain and Rin being the focus character. It has a very Adult Fear theme to it. Children go missing and then Rin decides to look for them in another city. She sees Ryunosuke mind-controlling kids and leading them away by the hand. Then she finds his lair. Then it's a Moment of Awesome for Rin. Then Rin nearly gets jumped by one of Caster's tentacle abominations, and Kariya gets to pull an awesome Big Damn Heroes moment.
    • The worst part, this is the anime TONING THINGS DOWN by expanding things. The anime has Rin save the children (one of them being a friend of hers and the reason why she went after Caster in the first place) before the monster almost eats her, the light novel and manga, on the other hand, has Rin being confronted by the monster, saved by Kariya and taken to her mother right as she's about to enter Caster's lair, preventing her from saving the children (one of them being a friend of hers and, as mentioned above, the reason why she went after Caster in the first place). And the manga actually makes it worse later: At one point, Waver and Rider find Caster's lair and Waver vomits from what he sees but that we, the viewers, don't. In the manga, what makes him vomit, and that we unfortunately see, is what Caster has done to Rin's friend, just to make sure we know that she failed.
  • Just Berserker possessing a JASDF F-15J with the pilot still inside. Also includes said destruction at the hands of Lancer.
    • Caster's monster eating one of the planes with the pilot still in it.
    Command: "Report, what do you see? Report!"
  • Episode 16: There's something extremely unsettling about watching Lancer's complete meltdown as he dies with his honor completely crushed, raving madly at everyone present.
    • Those orange eyes pouring blood... There's nothing worse (or sadder) than seeing Lancer cursing the world with that expression...
    • It's also very unsettling that Lancer's voice suddenly turned so fittingly dark and terrifying. Hikaru Midorikawa may have played some terrifying villains, but none of their voices in their worst came close with how he did Lancer's last moments in how terrifying it is.
    • Kayneth begging for a Mercy Kill soon later.
  • Episode 17: Kirei's betrayal and his murdering of Tokiomi. The rather gleeful smile Kirei has before stabbing him is especially unnerving.
  • Episode 18: Kiritsugu witnessed a horrific event during his childhood. His Precocious Crush transforming into a Dead Apostle and then setting off a Zombie Apocalypse. He has a front row seat for people getting eaten. The Church's executors and the Mage's Association show up and kill the Apostles, followed by the mages deciding to torch the island to preserve the Masquerade. Finally, he finds out that all of this was caused by his own father, and that his father couldn't care less about any of it.
  • Episode 21: Kariya's strangling of Aoi is played in a disturbingly sexual way, and Kariya's wailing once he realises what he's done is haunting.
  • Episode 22: First, it is extremely unsettling to see Kirei snap at Irisviel because he can't stand an Artificial Human with genuine feelings, when he, a genuine human, can't feel real emotions...
  • Irisviel's (Angra Mainyu's) scream of terror as Kiritsugu rejects the Grail by shooting the apparition of his own daughter in the head. Adult Fear indeed. Worse, it's unclear how much of this is the actual Iri in the Grail, and how much of it is just Angra trying to con Kiritsugu into killing the planet.
  • Both of Kiritsugu's background episodes are filled with this. The Dead Apostles, the bees...
  • Every time The Dream Fades Before Dawn #3 begins to play. While the first half is identical to the first iteration of the song, the second half quickly descends into creepy ambience and sounds, culminating with an off-key, twisted, and haunting version of the main melody of "Let the Stars Fall Down" and "Manten". Considering that this plays when Irisviel falls into the corrupted Grail and Kiritsugu is shown just how his wish will be granted, it can be said that the song serves as the theme of Angra Mainyu.
  • Gilgamesh's proposal to Saber was squick for a number of reasons. First, he got her attention by nailing her to the ground with a la sword through the leg. Second he tells her to marry him, and then makes it clear he doesn't care whether or not she wants to.
  • Kariya's death is a mixture of a nightmare and a Tear Jerker. Through sheer force of will, body ravaged beyond belief, he manages to walk slowly from the aftermath of Saber and Berserker's final duel-to-the-death to his home. There, he descends into Zouken's hellish basement where Sakura's innocence was robbed and says out loud that he's there to save her. He creates a Hope Spot as he imagines taking Sakura away to reunite with her family, including a healthy Aoi; reality reveals Kariya's corpse on the stairs, which then falls to the floor and is slowly devoured by Zouken's worms.
  • One for the Einzbern Consultation Room, but based on Iri's comment before Lancer arrives about how fast the Greater Grail shows up, and how dark her comments can get at times (or the Jerk Ass behavior of driving Lancelot insane again), it's very well possible that Angra Mainyu could be staging takeovers on Iri and directing the Servants to the Greater Grail while Iri may want to genuinely help them.