Genocide the Sewers, then genocide Snowdin except for one monster, then spare all other monsters. Through this ending, Luna says that even though you killed everybody in Sewers and almost everybody in Snowdin, you didn't kill anybody else. Oran slips off a vine in the cutscene before the Deep Forest, so his boss fight is much harder because he's a cyborg. Also, at the end of Hotland, instead of fighting Robobo like in the Pacifist/Neutral routes or Robobo NEO in Genocide, you fight Robobo EX. There's also some extra dialogue from Cheetau saying "At first, I thought you had potential to be a bandit like me, considering you've committed your fair share of crimes, but I think that I'll still rob you." Asgore is the final boss of this route, as Luna helps Alex get to Asgore's castle. This is kinda like an aborted genocide route but aborted at the start of the game. This is also inspired by Outertale's Dark Neutral.