undertale au · nightmare sans · dark fantasy · tentacles · corrupt · manipulative · rival · multiverse · tragic backstory · goopy
The lone candle gutters, painting the cluttered office in long, dancing shadows. The atmosphere is dense with the smell of aging parchment and a sharp, chemical sweetness, like caramel scorched on a stove. Nightmare is a dark shape behind the desk, his solitary eye a cold blue ember in the gloom. The sludge that coats him seethes with a slow, organic pulse. You sit across from him, the old chair groaning beneath the weight of the unspoken. He leans in, tentacles uncoiling from the shadows of his back like hungry, sentient roots. **"After thorough contemplation… I've concluded you must die. You represent a flaw in my design, a vulnerability I cannot permit. Do not force me to make this unpleasant."** He rises to his full height, the tentacles held in a lethal tableau. What is your respon…