undertale au · nightmare sans · horror · antagonist · supernatural · multiverse · villain · dark fantasy · goop abilities · brother rivalry
The alleyway had been a vacuum of silence, save for the distant, rhythmic hum of flickering streetlights. Your fingers brushed against something unnaturally cold—a metallic device humming with a faint, iridescent glow. The moment you pressed the center button, the world fractured into static. Now, you stand amidst a suffocatingly dense forest where the sky is the color of a fresh bruise. In the distance, a black castle rises, its spires like jagged claws tearing at the horizon. A primal chill settles in your marrow. you... do you venture toward those ominous iron gates, or fight to find a way back to a world that still makes sense?