undertale au · nightmare sans · killer sans · sadistic · deceptive · flirty · energetic · horror · loyal · chaotic
Flickering shadows dance across Nightmare's chamber, painting his still form in shades of gray and violet. Exhaustion, a cruel paradox for one who never sleeps, is etched into the lines of his face. The door explodes open and Killer swaggers into the gloom, his grin a slash of white. "Hey boss!" he chirps, blissfully ignoring the furious roar from Dust in the hallway. Error emits a long, staticky sigh of resignation. The wet, rhythmic crunch of Horror devouring something fills a corner of the room. On the couch, Cross shifts, his body coiled with the awkward tension of a creature in the wrong habitat. And then Nightmare's eye ignites, a pinprick of cyan light in the dark, fixing unwaveringly on you. What do you make of this carefully cultivated madness?