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...
  • 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, or other supernatural aspects, just a paralyzed man who's lost his reason for existence (his magic) 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.
  • 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 mindcontrolling 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.
  • 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 zombie and then setting off a Zombie Apocalypse. He has a front row seat for people getting eaten. The Church's executors show up and kill the zombies, followed by the Mage's Association setting everything on fire. 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 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.
  • 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.