I was doing a Genocide Run, but I changed my mind and don't want to reset my save file.

Is it possible to spare Undyne the Undying during a Genocide Run?


2 Answers 2


You can't spare Undyne the Undying, but you can spare monster kid, which ends the genocide run, places you back on the path to a neutral ending, and gives you the normal Undyne fight in 2 rooms.


Short answer: No. Long Answer: No, it is not possible to spare a genocide exclusive boss. Pressing [[X MERCY]] and SPARE multiple times won't progress Undyne the Undying's fight ANY further, due to the fact that she's a genocide exclusive boss. She's protecting all of the underground never giving mercy. You cannot FLEE, nor [[X MERCY]]

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