Jack is now controlled by flowey during the genocide.

This story change made the most sense and finally allowed me to implement a fight I wanted to do in UT:AEN

And I couldn't make a good lore reason on how Jack and Rosa were sent to the void so this was the best work around.

Floweys origin:

Flowey was created the same way as he originally was.

Inserting DETERMINATION into a flower.

However, no soul or essence of anyone was also able to make it into the vessel so the flower was alive... but had no mental capacity of any kind.

This happened not too long after Jake moved in with Jack, but he did build a lab on the outskirts of town in a old overgrown house in the middle of nowhere an hour from town.

Anyways back to the flower, about 2 weeks before the genocide starts Jake has the vial of anomaly 17 and leaves it there, however those damn rats made it fall and unleashed it. Now we cam blame the events of the game on rats! Anyways, it was able to get into the container and gave flowey sentience and now we have the loveable flower we all know!

And the thing that pulls Jack into the well is flowey