#dt4

and it can't be rudy either because his pain is too long term to be accounted for

...

You see, a big reason why I always try to keep an open mind and remember all the information we just don't have yet, is that it's very likely that at this point in the story, any theory about the Big Endgame Revelations will include a few unconfirmed assumptions or probable-but-not-confirmed implications ... and when one is extremely attached and emotionally invested in a theory, it's very easy to lose focus on what has been actually textually confirmed in the text, what is a probable implication and what is just a headcanon at this point.

That is to say, there is no definite textual evidence right now that the Knight would die or experience pain from being in the Light World for a prolonged period of time.

It's true that the moments that are confirmed to be them operating in the Light World (moving the captured Undyne to the Shelter Dark World, making the First and Third Sanctuaries and probably hiding behind that door in the Church) are extremely brief, and Ralsei does point out that the Knight tend to only operate in the Dark Worlds

And speaks as if sealing the Fountain will basically take care of the Knight problem for now.... But we have no way to know if that means "the Knight cannot sustain themself for long in the Light World so they'll have to flee back to the Shelter" or if it's more like how Susie clearly interpreted the line, that in the Light World the Knight is kind of a loser who is genuinely afraid of getting jumped by two teenagers.

... Or it could be something else entirely that's making the Knight run and hide from Kris and Susie in the Light World. When Susie started talking about how if the Fountain is sealed "it's over" for the Knight, they just started laughing. She took it as confirmation that she's right... but...

(And of course, it's important to remember that another factor in Ralsei saying what he did is that he's actually trying to urge Susie and Kris to seal that Fountain as soon as possible in the hopes they can avoid seeing Final Prophecy, so his observation is inherently biased as well)

At this moment we have nothing to even establish the possibility of a being who is Lightner enough to be in the Light World for any amount of time and create Dark Fountains, but also has to be in the Dark World to survive. That's just not a thing that Exists in our current understanding of Light and Dark. It's absolutely not an unreasonable assumption to make, and I highly doubt that we finished learning all there is to know about how Light and Dark work. After all, we didn't know of the possibility of the Dark resurrecting Lightners as Darkners before Gerson showed up either.

But... it's important to remember that this is an assumption that came mostly as explanation and support for folks' "Dess is the Knight" theories. (Similar to how "Rudy is the Knight" folks have their own theories as to how the Dark World could temporarily cure his illness). It's not confirmed in the text yet. The fact that it's probable that we'll get some new revelations that break our current understanding of how Light and Dark works also means that we can't fully expect how they'll be broken.

Again, I am trying to keep an open mind. It is entirely possible that Dess is the Knight as a being stuck between being a Lightner and a Darkner. It's possible that Dess is the Knight but she's also just an ordinary Lightner and there's a totally different explanation to her behavior. It's possible that Dess and/or the Knight are this sort of oxymoronic metaphysical being while also being totally separate entities. It's possible that Dess is the Knight while a totally different kind of oxymoronic metaphysical being than what any of us could imagine.... There is so much we can speculate on, and so little we can definitely disprove.

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