UNDERTALE GENOCIDE ENDING (SPOILERS)

The Genocide Route leads to one of the three main endings of Undertale. It consists of the protagonist killing every possible monster in the Underground.

This route's ending can occur without prior completion of the game, unlike the True Pacifist. Once the protagonist completes the Genocide Route, subsequent True Pacifist Route and Genocide Route endings are altered – even after a True Reset, being informally called "soulless routes".