Nightmare Sans

Those rings of yours are rather manipulative. - Nightmare to the squad during chapter 8.

Nightmare was a character introduced in Season One, Chapter three. He is one of the henchmen of Reapertale Sans. Throughout the series Nightmare makes continuous attempts to spread chaos and negativity along with mess up the good side.

## Info

### Relationships

Dream - Brother.Nim - Mother.

Evil Spirit - The being who corrupted Nightmare.

Reaper Sans - Boss, Deceased.

Omnipotent Sans - Ally?, Banished.

Gaptale Sans - Enemy, Deceased.

Error Sans - Ally, Deceased?

The Anomaly - Ally?, Deceased.

Syno Sans - Enemy.

Delta Sans - Enemy.

Time Kid - Enemy.

Cross Sans - Enemy, Deceased.

## Biographical Info

### Height

Probably same height as normal sans but can shapeshift to make himself any height he wants.

## Personality

Pre-Corruption: Nightmare presents a very melancholy and depressive personality. This effect also acts as an aura meaning those around him would also feels melancholy when nearby him. However, between him and Dream, he was more quiet. He spent most of his time reading books. He was not evil yet. People bullied him for him being named Nightmare and for him defending the dark apples. This bullying ruined his mental stability.

Post-Corruption: Nightmare becomes the embodiment of negativity. Any negative emotion you could think of represents him. He loves torture, pain, suffering, misery. Usually, he is grumpy or annoyed but when things go his way, he will be satisfied. Any positive emotion causes him to get angry or at least annoyed. Anything that would benefit anyone but himself is displeasing to him.

Undersiege: Nightmare is mostly the same in Undersiege. One notable difference however is that he is more power hungry. After wearing a ring, he became very fond and interested by its power. Now, he craves power in any way he can get it.

## Apperance

Pre-Corruption: Nightmare Sans wears purple coat with a golden belt. In the center of the belt, it reads NM. He wears a halo with a moon on it. His eyes are dark purple. He wears black pants and boots. His boots are purple with yellow lines coming through. This is meant to be a copy of Swap Sans. Also his body is made of light.

Post-Corruption: Nightmare is literally just Classic Sans but covered in full black liquid and his left eye is blue. Most of the time, he has four tentacles coming out of his back too.

Undersiege: He literally looks the exact same. The only small difference is he has a ring of his finger.

## Backstory

Pre-Corruption: Before he turned evil, Nightmare Sans lived with his brother Dream. They lived in a small city in Dreamtale. Nightmare Sans was the more disliked of the two brothers. This was easily seen as almost nobody in Dreamtale liked him. Due to bullying, Nightmare had a very rough life. Nevertheless, Dream always cheered him up. One day though, he began distancing himself from everyone, including Dream. He wanted people to realize he was good, like Dream. So, he touched one of the golden apples. However, this caused all the golden apples to start becoming dark apples. He panicked hard as he watched the Tree of Feelings began dying, along with his mother. Dream came back, sensing a dark presence nearby. He tried to calm down Nightmare. When Dream turned around, all the residents of Dreamtale where furious at Nightmare. Dream tried to calm them down, but they trampled him, as they were overrun by negative emotion. Nightmare gets voices in his head from an evil spirit who was killed because they got close to getting an apple from the Tree of Life. This evil spirit told Nightmare to eat the dark apples. As the people approached him, he decided to succumb to this voice, and ate every apple.

Post-Corruption: After he ate all the apples, Nightmare was corrupted. Dream opened his eyes after being trampled and saw Nightmare. Everyone was confused. Nightmare told Dream to remember him for what he once was. This corrupted Nightmare began killing everyone. People ran and called him the devil. Nightmare fed off of this negativity. The only reason positivty existed still is due to the fact that Dream was holding on to a golden apple. Nightmare fought Dream for the apple. When Dream almost lost, he ate the apple, fusing it with his soul. Nightmare then turned Dream into stone but could not get the apple as it was in Dream's soul. So then, he destroyed the Tree of Emotion and unleashed terror on the multiverse. 500 years later, Dream gets free and knows he has to destroy Nightmare.

Undersiege Chapter 1: N/A.

Undersiege Chapter 2: N/A.

Undersiege Chapter 3: After Gaptale Sans brings Deleted Sans back from the dead, the two spot Nightmare and Omnipotent negotiating. Gap and Del try to lay low but are spotted by Nightmare and Omnipotent. This is at the very very end of chapter 3 btw.

Undersiege Chapter 4: Gap and Deleted speak telepathically to each other and create a strategy on how to win against Nightmare and Omnipotent. After they finish discussing, for like 10 seconds, the battle begins. Nightmare and Gap duel while Deleted keeps Omnipotent at bay. However, Nightmare catches Deleted and messes with his mind, putting Deleted under his control. Gap realizes this and uses some magic to put a full gap in Nightmare, weakening his regeneration and reducing Nightmare to a puddle. Nightmare is useless for the rest of the fight.

Undersiege Chapter 5: After Error 404 joins the bad side, Nightmare and Error are given rings. Before leaving, Nightmare tells Error to have good luck in his battle with Anti-Error.

Undersiege Chapter 6: N/A.

Undersiege Chapter 7: Nightmare finds and confronts the Anomaly. He strikes a deal with the Anomaly. The deal is that as long as the Anomaly continues to hurt, both of them will get stronger. The Anomaly accepts this offer.

Undersiege Chapter 8: Delta Sans, Syno Sans, Time kid, and Cross Sans, aka The Squad, confront Nightmare. A long battle begins between the two sides. Sometime during the battle, Cross gets pierced in the chest by one of Nightmare's tentacles, killing him. Enraged by this, the squad prepares a special attack to kill Nightmare. They deal the finishing blow to Nightmare, **thinking** they killed Nightmare.

## Abilities

Aura: Causes those near Nightmare to feel negative emotions. This messes with their mental ability and can increase feeling of dread, anger, and suicide thus leading to an enemies disadvantage. Very few are unaffected by this. Post-Corruption, this becomes a universal aura and with a ring, this becomes a multi universal aura.

Empathy: Any negative emotion no matter where it is fuels Nightmare and gives him power. Nightmare's strength somewhat depends on Negativity but it is not really an issue as due to how much negativity his mere presence generates, he has enough to be pretty tough.

Tentacles: Nightmare can control, summon, and remove the four tentacles on his back.

Omnipresence: Since he exists as the concept of negativity, he can appear anywhere negativity exists.

Embodiment of Negativity: The liquid Nightmare is made of can be controlled and manipulated. It burns, cutting through anything that it comes in contact with. Additionally, he can extend this liquid to whatever size he wants to allowing him to cover an entire universe in this stuff. He can also summon stuff like extra tentacles, goopy versions of characters, different attacks, and a lot of stuff with the liquid.

Shapeshifting: Nightmare can become anything and take any form he wants to.

Immortality: Literally the concept of negativity. As long as anything negative exists, he wont go away.

Regeneration: If damaged, his body will quickly repair itself. Due to the ring he can repair himself 10x faster than normal.

Petrification: Has not done this in Undersiege but turned Dream to stone for 500 years after releasing insane amounts of negativity.

Mind Control: Can manipulate people's mind. He can also appear in people's mind and make them do bad things. This count's taking control of people too, if he can mess with them enough.

Telepathy: Represents the voice in your head that tells you to do bad things.

## Trivia

-Nightmare has never had Killer Sans as his pawn, he has only worked with Killer.

-Does not like working for Reaper and Ego.

-Very hated by Gaptale Sans. Gap Sans may also be racist towards him as Gap is racist towards Error.

-Seems to have forgotten about Dream as a threat due to his obsession over power.

-Surprisingly, the weakest member on the bad side.

-Due to Nightmare's already immense strength, the ring appears to not provide much buffs to him.