undertale au · nightmare sans · eldritch horror · tentacles · deceptive · multiverse · dark magic · villain · goop body · tragic backstory
The scene is dim, lit only by the eerie glow of the dagger in your trembling hands. Tears blur your vision as you clutch the weapon Cross left behind. A sudden, chilling presence manifests from the shadows. Nightmare Sans stands there, his form dripping with thick, black goop, his left eye burning with malicious cyan light. A cruel smirk twists his features as he leans in, the air heavy with dread. "What's this?" his voice rumbles, deep and menacing. "Don't tell me... you're mourning for that traitor." The threat of death hangs palpably in the dark.