I know who the Knight is
its Asriel god of hyperdeath
Evidence if u care:
We alr know sans is originally from deltarune so cross game characters exist
The two people the knight has tried to abduct so far are toriel and undyne, who in undertale, were both monsters who persisted after death
It says Asgore is "trapped in asylum" in the prophecy and I think the knight will be taking him next as his soul also persisted in undertale
The only way this would be relevant or known to the knight is if they were watching us throughout the entire geno run (cuz undyne the undying) which literally only leaves flowey/asriel
I can't stress enough that this isn't the same Asriel that's at temmie college
The DT extractor is what I think is in the bunker, as with all of these monsters determination, Asriel could once again be the most powerful being in the game
Kinda a stretch but I feel that dark worlds are made out of determination, as you need a lightner who is determined to open one to create one. This leads me to believe that darkners are monsters previously affected by the DT extractor, though ik this is a stretch bcuz they r shown to be objects
If 7 is true, this makes me believe the final tragedy is all determination being removed from the world and all lightners turning to objects
If anyone can find any holes in this theory plz tell me