The Final Timeline (Undertale Sans x Frisk)

Chapter 29 Double Determination

"So let me get this straight" you say now practically laying on Sans' lap "You were the one who created the core, it overheated, you and Sans got everyone out, then you died by falling into the core?"

You ate a slice of cheese.

"No. I didn't die." Gaster said annoyed.

"But you said that the void was were my save and loads come from, and that if I wanted to go to the void, I would have to die."

"if 'you' wanted to go the void, frisk." Sans explained. "it's because of your soul and how much determination you have."

"Yes." Gaster continued Sans' thought. "You are the only human that I've seen in a long time who has the ability that you posses. I fell went into the void because my body had mixed with the determination that first powered a specific project I was doing."

"And that was?" You asked.

"a time machine." Sans said bluntly. "that's why he got sent to a place without time at all, right, dings?"

"Yes, Sans. I used the only determination that was left in a previous human soul. It was cracking and most of the power was absorbed anyway, so I salvaged what was left of it." Gaster said.

You were a little confused. You thought you were the only person who could save and load. You were the most determined soul in the world, that's why you have those powers, right? If what they're saying is true, that means that a human who fell into the underground also had your same ability, but couldn't use it because their soul was absorbed for even a brief moment.

"Did someone really have the same power as me?" you asked. "A human I mean, not someone like Flowey or Asriel."

Sans stiffened from underneath you, almost like he wanted to forget about something you said. You looked up to see his blank expression.

"kid... i think you know the answer to that one..." he said.

Then it hit you. The person who woke from the dead because of your determination in the first place. The person who eventually got power hungry and controlled your body. The person who, sometimes, would load your death for you if you died to Undyne on that stupid bridge, or Sans in... the judgement hall...

Chara

You shook at your own realization. Chara had the power to save and load when she fell into the underground, and when Asriel absorbed her soul, the power was being drained, making her unable to load. Gaster took what was left of the soul when Asriel died to try and create a time machine. However, the core overheated, causing him to fall into a world without time. The void was created by Gaster, and he sent himself there, trusting Sans to create a gateway eventually.

That's why Chara was able to control your body. You have the exact same determination that she had.

"I know that you may not understand what happened back in the underground." Gaster said. "But that time is over, and I have been watching over all possible endings. I know things that will soon become a reality. However, even my power has restrictions. For you see.."

You heard a low ping of magic being turned on, and both of his eyes were coloured. His left was blue like Sans' and his right was the same orange colour that you saw Papyrus have.

"I am connected to my sons..." he continued. "So I am only able to look at their possible futures. No one else's."

Now it made sense why he was so surprised to see you when he came out of the void. He didn't know that Sans would have anybody in the back with him. It all made se-