i will explain more in the comments

Five Nights At Freddy's: The canonical event and Springmilk

One word:

R E M N A N T

I mean it basically is why Afton is still around and Matpat did claim she would have gotten all of the notes about remnant. Plus it was kinda why afton is still running around. Unless it was the agony. If it was agony she is dead

how would a living human use remnant

Thats the thing. They can’t. I just forgot that bit about remnant

Drink it and die

Then become possessed

no sh#t sherlock

hey, don't call me stupid when matpat missed that too

Yes

YES THATS WHAT I THOUGHT TOO

i just thought of it

…unless she was a minor— IN WHICH CASE WILLIAM HAS A LOT OF EXPLAINING TO DO

A small summary about Remnant: Remnant is a soul energy that drives emotions. This element has the ability to regenerate a person. It was studied by William Afton who was the key he needed to achieve his goal: immortality. Despite this, in the books, Afton stated that he never tested on humans or himself to regenerate. The weakness is precisely overheating, that is, the fire to be able to neutralize the element

A short summary about Agony: Agony is an element that is powerful and negative feelings generated by any person or soul marked by some trauma. Like Shadow Bonnie and Shadow Freddy. It can also bring inanimate objects to life. William Afton was so afraid of dying that he ended up overcoming it because of the Agony. And as it is very evil, it made it powerful to the point of surviving the fires. That's why he always comes back. So much so that Springtrap, driven by Agony, does not sustain himself on flesh but on people's fear