This is an Au Where Sans goes insane from 4000 resets and resorts to Alphys for determination. sadly it fails. but as Sans starts becoming an amalgamate he remembers the R E S E T S. and T I M E L I NE S and barely stops it. As he waits in Snowdin End or the player [he teleported home and Papyrus was in shock so the player got less LVL in the end. he convinced Papyrus to stay [shocker right?] ..] when the player gets there he instantly attacks them Trying to make them reset once more but they won't. reset. so he finds the most painful way to kill the human. all across the land.
Destruction by @Leftbite Au by me just, wait?? it's an rng simulator basically