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Nightmare Fuel / Underverse

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Unmarked spoilers ahead!

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And you thought X-Event!Chara was creepy...

  • X-Event!Chara torturing Underswap Sans, Papyrus and Chara. He repeatedly makes the trio suffer through genocide routes, turns Swap Papyrus and Swap Sans into amalgamates, and even makes Underswap Sans attack and get killed by his brother. And X-Event!Chara's doing this to pay back Nightmare, and to take revenge on Ink, while still enjoying himself in doing so. No wonder Swap Sans is less than pleased with him when he finally breaks free.
  • Error's dream in Xtra Scene 2. It starts out humorously enough with Error's downtime watching "Undernovela" suddenly getting interrupted by Ink. However, the whole sequence has an unsettling feel to it, with Ink acting uncharacteristically passive-aggressive almost the whole way through and the rest of the heroes only showing up once in the background, giving creepy smiles. Ink then abruptly drags Error into an empty black void, where he is confronted by XGaster, telling him he'd better wake up, since "their game" is getting more interesting. The dream ends with a Jump Scare as Ink suddenly appears in front of the screen, pulling a Nightmare Face and assuring Error that "it" will be fun.
  • This video, which seemingly shows the events after 0.4. If it really is taking place after that and the message in the description is to be taken at face value, XGaster and the cast of XTale have arrived in the main universe to make it their new home.
    • The nail on the coffin? XTale!Frisk is with them as well.
  • XGaster's gradual decent into madness. With each timeline, his actions become more cruel and sociopathic. He also seems to care less and less about XTale!Chara and XTale!Frisk, calling them "ungrateful brats" and even straight-up brainwashing Frisk in timeline IV in order to start a Genocide Run.
    • Seeing what both XChara and XFrisk went through at the hands of XGaster. All of the terrible things that XChara does to the Underswap Cast had been done to him and his brother.
  • Ink's true nature. Behind the happy-go-lucky Cloudcuckoolander facade, he's actually a merciless sociopath, not unlike XGaster. You get snippets and hints of this throughout the whole series, but 0.4 is where you really see him for what he is. He cares nothing for other people's lives and worlds and all of his actions have been motivated primarily by his desire to feel, instead of a genuine devotion to his job as the guardian of the Multiverse.
    • This is hammered home again with XTALE 0. It starts with Ink greeting someone (presumably the viewer) in his characteristically up-beat persona and calling the previously unfolding events of 0.4 "awesome". 0.4 featured death, betrayal, and heart-break all around, including two members of Ink's own team dying to XGaster after he betrayed them. Yet here he is, smiling and joking like nothing's wrong.
  • XMettaton's face after absorbing a lot of the main universe's population's souls. He has black teeth. It only gets worse while using overdrive
  • We finally see a more serious side of Fresh, and oh boy is it scary. Throughout his fight against Ink and Error, Fresh employs psychological warfare against them and exploits their weaknesses (the vials for Ink and haphephobia for Error). Additionally, Fresh's true form, the parasite, finally reveals itself before joining Ink to become Fresh!Ink.
  • In the Prequel Comic, the tenth timeline sees denizens of the Underground realize they can't actually remember anything about the Surface, with written records also being non-existent. Even Gerson, someone who ostensibly lived on the Surface, can't remember anything about it. It seems that not filling in the backstories for your characters has consequences.
  • In 0.7 Part 2, we finally get to see FatalError!Sans, and he is nothing short of pure nightmare fuel. Even before he is properly introduced, his red eyes pop up for a moment before violently whisking away Cross and Ink!Sans from XGaster to his corrupted save world. It doesn't get any better when he is shown on-screen, utterly glitched out with computr crash screens and glitch marks, with a slasher smile and a dialogue that is scattered across the screen.
    • The fight is an essentially one-sided beatdown as both Cross and Ink!Sans are barely able to defend themselves. The battlefield is so utterly corrupted that Cross has a hard time seeing past the corruption, Ink is unable to teleport them out of that world, and Fatal's strings are able to cut through anything like a hot knife.
    • The red strings in general. The comics state that the strings are made out of determination, but we can see here that they are far more efficient than Error!Sans' strings. They may not be able to grab anyone's souls, but they can still burn through anyone and anything. Just ask Ink, whose arm nearly got ripped off (though at least he can't feel pain), or Cross, who had to sacrifice his hand to break free from Fatal's strings.
    • Fatal's eyes are indications of his emotions. Red and blue eyes indicate default state, blue eyes indicate sadness or frustration, and red eyes indicate danger and/or single-minded hunt. For most of the fight, Fatal's eyes are red. He is genuinely determined to retrieve their code, and nothing short of a KO will stop him.
    • It's really telling that Ink, who didn't break a sweat against most of the threats of this series, including XChara and Error, is now having serious trouble taking down Fatal.
    • Cross was only able to get out of this fight by XGaster sending a slash through Cross against Fatal. This kills Cross, allowing XGaster to reload him to the main timeline, and knocks out Fatal, allowing Ink to hop out of that world. However, Fatal wakes back up after "rebooting", showing he may not be entirely done yet with XGaster.

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