The beginning of nightmares

***ACT 0 - Prologue***

Once upon a time, humans and monsters lived in peace and harmony, but one day, war broke out between them. The humans defeated the monsters by imprisoning them under a mountain, but while reading the spells for the barrier, one of the mages made a mistake and let a terrible spirit inside the dungeon. As it turned out later on the surface, this mage did it on purpose. At first, the monsters lived peacefully, began to organize the kingdom, cities, and so on. The spirit that was let in by that mage was watching all this evolution and waiting for the right moment to start its fun. When 5 years had passed since the monsters had been imprisoned, the Spirit, Exeller, waited for Sans behind the house, and tried to get him into the lab behind the house with hints. He succeeded. Sans, upon arriving at the lab, saw a dark figure that looked exactly like him. As he approached the figure, Sans felt his body not obeying him. Sans lost consciousness and his soul began to change. His soul was in the shape of a star, with a dot in the center, and four spheres in the corners. Sans, upon waking up, felt someone's presence. Suddenly, Exeller himself spoke to him. Exeller was deceiving Sans, and rubbing into him things that could not happen in principle, but Sans, as if under hypnosis, believed him, and he was provoked to "Free" his soul by KILLING his friends.... Sans resisted of course, didn't want to do it, but the spirit's words were too convincing... **And just like that, the story begins...**

***ACT 1 - Alphys***

The first target Exeller chose was one of the weaker but future problematic targets, Alphys. He explained this by the fact that she could see them having fun on the cameras. Upon arriving at the lab, Sans greeted Alphys, making jokes along the way. Sans asked Alphys to come with him to True Lab. Once there, Sans already wanted to start doing work. Alphys and Sans walked to the room with the DT Extractor. Alphys activated it, hoping that Sans would disarm it. She had noticed long ago from the cameras that Sans was under spirit control. Sans tried to convince Alphys that it was for the greater good, but she refused to believe him. DT Extractor snapped. Alphys, terrified, began to run away. Sans teleported right in front of her, and said: "goodbye al", and punched Alphys with his hand, leaving a hole in her. The spirit told Sans to absorb her soul using his power. Sans absorbed Alphys soul, and one orb on his soul changed its color to red. **The game was just beginning.**

***ACT 2 - Undyne***

Exeller's second target was Undyne because she could summon the entire royal guard, again evacuation was possible. While walking towards Undyne, Sans met Monster Kid. He started talking about Undyne as usual, how cool she was, and so on. Exeller offered to kill Monster Kid, or else, use him against Undyne. Sans offered to use it. Monster Kid and Sans reached Undyne's house. Monster Kid ran to knock on Undyne's door. After a while, Undyne came out of the house, and saw them. She asked them what they were doing here. Sans said just having some fun, just like old times. Undyne looked at Sans suspiciously, but then just let them into the house. Sans boned Monster Kid in the leg with a bone. Undyne pulled out a spear to hit Sans, but the man came up behind her and a bunch of hands emerged from his jaw. With those hands, Sans killed Undyne...? leaving a bunch of holes in her. Monster Kid looked at Sans with tears, but he only grinned as he killed him with his bones. As Undyne moved 3 meters away from Undyne's house, he saw a bunch of spears piercing Sans. Undyne, already in armor, was walking towards Sans. Sans easily took out all the spears, also walking towards Undyne, leaving a face of fear on Undyne. Sans body was changing slightly. His legs and arms lengthened, and his body and head enlarged. Undyne looked at Sans in utter shock but attacked him. all attacks did not do any damage to Sans. Sans used a blaster that was much bigger and stronger than normal. Firing it, it left no trace of Undyne. **Sans was already ready to search for a new soul**, consuming Undyne's soul in the process, making a second sphere of red color.

***ACT 3 - Toriel***

Exeller's third target was Toriel. Sans knew how it could be done for himself painlessly. Upon arriving at the door, he started chatting with her as usual. But then, Sans outside the door summoned an area from the bones, thus killing her easily and absorbing her soul afterward. Sans feels a bunch of sins on him, he wants to end it by killing himself, but Exeller prevented him from doing so. There was also not a single person who could kill Sans. Sans starts screaming loudly, almost to the entire dungeon, causing him to raise a bunch of noise, and fear in most of the monsters.

***ACT 4 - Brother...***

The fourth target, Exeller offers to kill it himself so that Sans won't see it. Sans agrees because he can't take it all anymore. Exeller gains control of Sans' body, and goes to Snowdin. After walking a bit, he met Papyrus there. Without hesitation, Exeller kills Papyrus using the spikes from his bones. Exeller absorbs the last soul, in order to make all the spheres on Sans soul light up.... **THE GAME IS JUST BEGINNING!!!**

***ACT 5 - The spirits of hell.***

After absorbing the last soul, it begins to resonate, separating Sans soul from her body, and giving Exeller complete control over Sans body. Sans couldn't believe his eyes when he saw his brother's scarf nearby, and a pile of dust next to it. Sans tried to stop Exeller, but he made a fatal mistake. Sans and Exeller's soul fused, and they formed a new soul. It was with everything Exeller could do, but with a bit of Sans. In fact, it was still the same Exeller, but improved. And having found a way out of this pathetic universe, he decides to erase it, once and for all, using a massive beam. By destroying his Au, all that's left of it are pieces of code that will later merge into his former Au in the future. And now, Exeller is causing a lot of trouble in the multiverse.