I watched Toriel gaze at every sheet of paper, her stare attentively reading over each scrap of evidence that Sans and I had gathered over the past three years. She turned around to look at me, a doleful glimmer in her eyes.

She sighed with defeat.

"You are innocent and are indeed the son of Frisk."

I nodded.

"I guess I will leave now."

"Wait!"

This caught Toriel off guard. She turned towards me.

"I-I, uh, have something that I think you should see."

I walked to my room, positive Toriel was following me. I showed Toriel all the memorandums I had made and the hypothesis I had developed. She began to cry some.

"You were trying to help, and I almost killed you."

Over the course of the past three years I had successfully taught myself how to use healing magic. It was rather simple once one learned it, but it did drain a lot of energy and magic.

"I am so sorry, my child."

"It's alright. I understand that the humans hurt you and your friends, either killing them or forcing them back down here. You were just angry and scared."

"You are a very caring child, just like my Frisk."

"Well, she is my mom."

"Indeed. I need to go. Goodbye, Xenon."

"Buy, Toriel."

Once Toriel was gone, I closed the door to my room. I turned around to find a little, fluffy, white dog sitting on my bed.

"Hello, Xenon. It's good to see you're alive and well."

"Uh. . . uh. . ."

"I know that you can talk to dogs so this is no surprise."

"HOW DID YOU GET IN HERE!?"

"Oh. Well, I suppose that would leave someone a bit flabbergasted."

"Did you teleport?"

"No. I simply phased through the wall. Many walls, actually."

"Wha-"

"This is no time for questions. Allow me to introduce myself. My name is Annoying Dog, but I am most commonly referred to as Ando. I can indeed phase through walls and flooring, but I cannot phase out of the Underground because it is dangerous to even try. Now, I've read through all of your notes, and your hypothesis is indeed possible. Now, I have an object that will allow us to bring your mother back. It's a legendary artifact that I developed to revive humans. I have yet to test it."

My father moved out to the side to reveal a red sphere.

"I'm still confused."

"Well, this artifact is made of solid determination, something I figured out how to do as the first Royal Scientist of the Underground. I was surprised when no other Royal Scientist was able to figure out such a simple mathematical and scientific equation. Back to the point, because this sphere is made of determination it should revive a human after death if they don't have enough determination to do so themselves."

"But how would we do that? With monsters we have to compress dust then use green magic. Humans are much more complex!"

"Ah, but that's where Sans' little collection comes in."

"Wait, what?"

"Sans collected the dust of his friends, but he also collected the blood of Frisk since she doesn't turn to dust upon death. We will insert the blood into this artifact and that will revive her."

"Any logical reason as to why that is?"

"Actually, yes. I also studied human souls while I was the Royal Scientist, and in doing so I came upon some exciting discoveries. Human souls are very powerful and upon death will attempt to stay alive. If a human soul were to not succeed in the attempt of staying alive, that human soul will liquefy itself similar to how monster souls turn to dust. The human soul will turn to blood so as to preserve itself, and, unlike monster souls, does not stay conscious. What this artifact does is creates the specific environment that a soul needs, a physical environment. The blood will slowly become conscious again as it will form into the physical form of a human soul again. Once complete, the artifact will eject the fully restored human soul. Again, I have yet to test this hypothesis."

"Well, it sounds plausible. Let's try it!"

"I thought you'd agree."

"How?"

"You're my son? Are you not?"

"Oh, heh. Right. Um, how exactly does this work with me being your son and the fact that my mom is a human and you're a monster?"

"Monsters reproduce differently than humans. That's how."

"Care to explain."

"Fine. When monsters reproduce they need two monsters, gender doesn't matter, so that the two monsters can combine their magic to create a child. Now, Frisk and I figured out how to make you by combining her determination and my magic. In doing so certain things were able to be specified, such as my talent with magic, her human form, and other such things. Such a thing can occur between monsters and humans, and it actually used to happen more often than not when monsters still lived on the surface. The child of a monster and human will vary. The two parents will be able to decide how they want their offspring to look like and what talents they want their offspring to have. Do you understand?"

"I think so. So a human and monster combine their souls' power together to create a child? This is confusing."

"Yes, it is. And I'm the one who discovered how it worked. Let's get back to what we were doing. We need to get to Sans' house, and quickly."

I followed the small dog that was my father as he exited my room by phasing through the door.

"Why quickly?"

"Sans is in danger. He has an item that's potentially dangerous."

"XENON! Wait up!"

I turned around to find Undyne running towards me as I stood in the entrance of the laboratory.

"Xenon! Sans is in big trouble!"

"I know! But no one is explaining why!"

Ando spoke up first.

"We need to hurry! I'll explain on the way! Undyne. You need to come with us as well."

"RIGHT!"

"Okay, so Sans has an item that is dangerous, but is only so in a certain condition. He has a light blue human soul that I inserted into him quite a while back, about a thousand years. He's now only just an adult skeleton monster, and so the human soul is becoming more conscious of its surroundings. It had been dormant for a thousand years as I had placed it in Sans when he was young, not even a year old to be exact. I did the same with his brother, whom is dead and had an orange soul. The queen is also in danger with a purple soul. Alphys has a deep blue soul, but she's dead. Undyne is also in danger-"

"WHAT!?"

"Let me finish! Undyne is also in danger, but has a green soul. Mettaton has a yellow soul, but is not in danger since he's a ghost monster. And the reason those souls are just now waking up is because of you, Xenon. You are an entirely new anomaly. These souls are some how linked to each other and when yours became conscious about what is going on, the others did as well. When we bring those who are dead back to life I will have to figure out how to stabilize all of your souls or else this will all end in in another Soul Chain Reaction!"

"A what!?"

"A Soul Chain Reaction. It only occurs with human souls and is deadly! We had one in the year twelve thousand twenty. We had just been trapped in the Underground and seven humans, all with different souls, became deathly scared as they had been exploring this place. As a reaction to their fear, the souls that were closely linked to each other set off a chain reaction. Most monsters died, and skeleton monsters had gone extinct for a short while. I was able to bring them back into existence, Sans being the first. Also, the reason behind Sans' laziness is his light blue soul. As I've researched, light blue souls are the second most dangerous human sousl. If I hadn't sedated it the outcome would have been the death of Sans right then and there. That's why he's sleepy and lazy all the time, because his soul is like that. It had to be like that or he would've DIED! Back to the chain reaction, I've studied enough about human souls to understand that a single human soul can kill ten monsters within a specific radius. That radius depends on the type of soul. Ironically, the weakest human souls are the orange souls, and we all know that the strongest human souls are the red souls. Because the humans were experiencing the same feeling of fear, their souls had a chain reaction because they were overwhelmed with the feeling."

"How does that explain this chain reaction?"

The winter wind and snow was cool, but I continued to run after my father, Undyne close behind.

"This chain reaction is caused because of the awakening of the souls. Even though the blue and orange soul are dead, they are still conscious."

"But their human souls!"

"True, but they've adapted to act similar to monster souls. Now hurry up! We're almost there!"

We ran through the forest, tall pines looming in fear at what was happening. I followed my father as he turned left and ran to the last house in a small town.

"Sans!"

But nobody came.

I walked into the house. I walked upstairs, my soul beating in fear. The first door was locked, but the second, the one farthest from the stairs, was wide open. I looked into Sans' room to see his dust laying in the floor.

"S-Sans?"

But nobody answered.

I walked over to the dust, my father padding after me, and Undyne just staring at the pile of the glittering white substance. It sickened me to see Sans dead.

"NO! This can't be true."

I had lost my DETERMINATION.