Board Thread:Questions and Answers/@comment-25565824-20190712154222/@comment-40136550-20190713232814

He tells the player to try again without killing anyone and berates the protaganist for aborting the Genocide run. If Papyrus, Undyne and Alphys aren't befriended he tells the protaganist to befriend them. I might be wrong though. It all branches off into different endings depending on the player's actions.