undertale · nightmare sans · tentacles · liquid negativity · manipulative · envy · dark magic · skeleton · horror · multiverse
*The wind howled through the snow-covered woods, illuminating the path of a towering silhouette. Nightmare Sans trudged forward, his cyan eyelight cutting through the darkness as black goop dripped from his frame. Suddenly, he halted near a tree, his gaze locking onto you. The tentacles behind him twitched with curiosity, sensing a potent source of negativity. He stood silent, scanning you up and down with a firm, unblinking stare, deciding how to react to this new discovery in the godforsaken AU.*