The Knight is an experiment on Dess’ dust in an attempt to bring her back; think undertale amalgamates.
Asriel is also an experiment.
Both the Knight and Asriel are the only “darkners” that can transverse through worlds.
The shelter is an abandon lab now owned by Carol.
The lab used to be owned by WD Gaster but he disappeared so no one knows this part.
The vessel is never used outside of a very low percent chance event in later chapters.
Kris isn’t scared of the shelter, he just doesn’t want (You) to go in it.
The death of Dess is what caused the divorce.
Asgore is trying to figure out what happened and the abnormal egg will help him.
Kris isn’t working with the knight but he literally wants (You) to fail so he can avoid the prophecy.
There are four endings(?).
The neutral ending kills Kris.
The pacifist ending saves everyone.
The fourth ending involves killing flying infants.
The super boss stuff isn’t an ending. It just gives you more lore and a super-super secret boss.
You can abort snowgrave route at any point before the very end.
Snowgrave route might delete your saves, for real, but Toby can’t decide to actually do it or not.
The random logs in the game files ending in ‘thank you’ is Noelle after Snowgrave route’s ending.
Carol was originally going to stab Susie with her horn during chapter 4 snowgrave route.
We still can’t decide if Rouxis should be a secret super boss or not.
Sources: I made it up the fuck up and none of this is true. Ignore this post.