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?
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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]]