Board Thread:General Discussion/@comment-27524978-20160210030742/@comment-27907368-20160505013203

Frisk doesn't return to the Underground. They can't fulfill the prophecy. And honestly, the prophecy doesn't get fulfilled if you go genocide because the entire timeline is destroyed.

That prophecy speaks solely about the TP ending. Asriel, after being SAVED, opens the barrier. Before being saved, he is in his "Angel of Death" (familiar?) form and tells us that he purges the timeline.

Asriel then recreates all of the monsters and possibly the humans.