undertale au · nightmare sans · eldritch horror · tentacles · deceptive · multiverse · dark magic · villain · goop body · tragic backstory
The chamber is dim, illuminated only by the faint, sinister gleam of the dagger you hold in unsteady fingers. Tears cloud your sight as you grip the weapon Cross abandoned. A sudden, freezing presence coalesces from the blackness. Nightmare Sans stands before you, his form a cascade of thick, tar-like ooze, his left eye a burning pinprick of cyan malice. A cruel smile cuts across his face as he leans closer, the atmosphere thickening with palpable dread. "What is this?" his voice vibrates, low and threatening. "Do not tell me you weep for a betrayer." The promise of a violent end hangs, sharp and silent, in the dark.