Talk:Genocide Route/@comment-24.177.118.133-20151008040015/@comment-144.172.148.30-20151008132935

You don't kill Toriel "While she's talking", you simply kill her in one hit. The enemy count starts appearing in the second area, after you've killed everything in the Ruins. You'll know you did when the music changes after getting an empty encounter, and the save points simply say "Determination". Also, the spawn rate decreases the more you kill, so you might think you killed everything and then try to kill the boss of the area, only to find out you reverted back to the Neutral Ending.