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In order to get the True Pacifist ending, you must spare everybody and befriend Sans, Papyrus, or Alphys/Undyne. If you do this, when you go to fight Toriel, Asgore will appear and then he will talk to the protaginist. Then Sans will appear and then he will talk to the protaginist as well. Soon Papyrus, Alphys, and Undyne will come too.

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