Disclaimer: This is a crackpot theory, meaning I am aware of how crazy this theory sounds..
So everyone asks, who is the knight?
But never, how is the knight?
For this theory, I will be applying it to Kris Knight.
When Kris takes the soul out of their body they start to act very weak, like a zombie. Surely, that cannot be healthy, and implies certain things.
However, with the soul, during cutscenes, Kris is very energetic, even doing the, Prisiadki, also known as the russian kick dance.
From experience, the Prisiadk is a very hard dance to pull off, and has hurt my knees.
This implies that without the red SOUL, Kris is very weak.
This can mean that Kris is dead, or that simply lighteners cannot survive without a SOUL which is the source of determination.
However, what else can lightner SOULs do?
They can create dark fountains by stabbing the earth, they can seal one back up, or in undertale, if there are 7 human souls, or 6 human souls with all the souls of monsterkind, the barrier can be broken.
Here is an attempt by another lightner, Berdly, trying to make a dark fountain.
I was originally going to cut the text out, but know that I see it, I find it very important.
Creating a dark fountain involves concentrating determination, not just simply using it, which could mean that this piece of determination is what is keeping the dark fountain running.
This means that by creating a dark fountain, they are draining their Determination into the fountain.
If Kris has another SOUL besides the one we are using to control them, that SOUL is the one being drained, which is why they are very weak, and act like a zombie without our SOUL.
Which means that if Kris, if they are the Knight, keeps on using the dark fountains daily, their SOUL would run out, and they with die before they can get our SOUL.
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