Cigarette duet
Error/Geno by @ loverofpiggies/CQ
Anti Error by @a-v-j
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Cigarette duet
Error/Geno by @ loverofpiggies/CQ
Anti Error by @a-v-j

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Error!Sans Headcanon
On the extremely rare occasion that Error falls ill, he lags, like a particularly janky video game. His memory of that time is usually corrupted, too, so when he feels like heâs coming down with something, he cocoons himself in his strings in an attempt to recuperate without the likes of Ink or Fresh trying to mess with him.
Înk: Heh, Heh! Please don't pay attention to him! He didn't have a good time in his previous life!
Error: I am not having a good time in this life either! I am hoping for the next.
___
That is a reference from a series I watched lately, and my mind pretty much automatically made the connections.
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Error!lucidia by @loverofpiggies
Ink!sans by @comyet
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Nightmare's Gang [+ Error] Headcanon
(I would like to point out that the following list is a personal headcanon ) -------------------------------
Horrortale Sans: [~ 6'5"] tallest and leanest. age range - anywhere from 32 to 34 years
Errortale Sans: [~ 6'5"] same height as Horror. age range - unknown; data unobtainable due to timeless state of the Anti-Void
Nightmare Sans: [~ 6'4"] about an inch between him and Horror/Error; height increased due to corruption. age range - anywhere from 500 to over 1000 years
X!Tale Cross: [~ 6'] chin at level with Horror's shoulder. age range - anywhere from 25 to 27 years; data corrupted due to Overwrite
Killer Sans: [~ 5'6"] top of head level with Horror's chin. age range - ~ 27 years
Dusttale [Murder] Sans: [~ 5'4"] top of head level with Horror's shoulder. age range - anywhere from 23 to 27 years of age; syncs up with Undertale Sans' age prior to True Pacifist Timeline

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Nightmareâs Gang Headcanon
In fights, the group works like a well-oiled machine. Nightmare choreographs their actions and positions them where theyâre most likely to succeed, and provides backup himself if something goes awry. However, outside of fights, the group butts heads like snakes and mongooses.
Dust and Killer seem like they would get along well, considering their similar pasts of living through innumerable Genocide runs. However, Dust canât even comprehend the idea of giving into the human child who tortured him, killed Papyrus, and emptied the underground just because they could. Killer, on the other hand, was disgusted that Dust could kill his friends and brother, under his own free will, for some sanctimonious delusion that it would be better for them to become EXP for him than the human who destroyed their lives over and over again.
Killer and Dust donât care much for Horror. Despite the many human lives heâs taken, Horrorâs LV isnât on par with either of theirâs, but he had enough to not be easy EXP, which discourages them from trying. (And Nightmareâs threats towards dusting each other mightâve had something to do with it as well.) They thought him soft, despite the Hell his world was currently going through, because his timeline was a Neutral one, but his bite was worse than his bark, and they were reminded of that whenever they push him too hard. Horror, in return, despises the two Genocidal skeletons. The idea of dusting another monster (besides Undyne) was unfathomable; the monsters of his world fought tooth and nail for survival beside one another. While he held bitter feelings towards Frisk, and a dark pit of regret sat heavy in his soul for not stopping them in the Judgement Hall and saving his world from a perilous future, he didnât enjoy having to kill humans to survive. But he would do what it took to preserve what remained of his world, even work with psycho- and sociopaths in return for scraps to bring home to his people.
Cross is a difficult case. He isnât a murderer like the so-called âMurder Trio,â and had a whole slew of issues on a different scale from them, due to experiencing OVERWRITES instead of RESETS, and, recently, remembering the past âlifetimesâ thatâd gotten overwritten. But heâs also been betrayed by Ink, who was supposed to be his friend and a good person, so while he doesnât hold any ill-will towards Dream, he wants others to hurt just like he is. And because Nightmare doesnât expect any of them to kill for him (not if they can help it, which Killer and Dust sometimes canât), and Cross can meet his expectations of sowing chaos just fine, heâs an official member of the group. He avoids Dust, not so much out of dislike for the other skeleton - the few times theyâve interacted, the other proved to be more mellow towards him than he expected -, but because he likes to talk to himself sometimes, and that reminds Cross too much of having Chara in his head. He feels neutral towards Killer, and vice versa. They donât interact much outside of fights, though Killer extends the offer to teach Cross about fighting with knives, seeing as somehow, even without Chara absorbed into his soul, he can somehow summon the knife-blade still. Cross and Horror get along best out of the group, often paired up in fights because neither of them have their other teammatesâ high LV, and with Crossâ standard HP and Horrorâs dismal DEF, they have to have each othersâ backs, which leads to more camaraderie outside of fights than they have with the others.
Because Nightmare canât trust his group to be alone together outside of fights, Dust and Horror are sent back to their timelines once theyâve recovered from any injuries they mightâve received stirring up negative emotions in universes or scrapping with Ink and his posse. Error, while not an official part of the group, uses the abandoned universe Nightmare claimed as his territory to get out of the Anti-Void when Outertale is being patrolled by the Star Sanses or their brainwashed âallies,â and in return, he snared the souls of Killer and Dustâs Charas and turns a blind eye to the existence of the anomalies that NIghtmareâs decided to collect.
Murder Time Trio Headcanon (+ Geno)
Dusttale, Horrortale, and Killer!Sans all have a shard missing from their souls, because Geno!Sans was the original âClassicâ Sans. Geno, watching from the Save Screen, didnât interfere with Horrortale or Killer!Sansâ timelines, which allowed them to grow into their own âuniversesâ within the Undertale Universe, but Dusttale Sans was the first Sans he pulled into the Save Screen, and was the only Sans who agreed to try and help Geno accomplish his goals. He eventually was driven mad by the countless genocidal RESETS he lived through and turned to murdering monsters in an attempt to combat Chara; Geno didnât interfere with that timeline again. (Error somehow gets along better with Dusttale Sans than the rest of Nightmareâs entourage, but neither one can pinpoint why.)
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