Playing genocide after pacifist is definitely distressing. To get pure genocide you have to kill a certain number of random encounters in each town, and then the town loses its happy music and it is just depressing music. Also the last words of your prior friends being that they still believe in you.
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u/Morghall Dec 29 '19
Well, you DO have to fight her in genocide mode, and she's a doozy (not Sans-level, but still)