undertale au · nightmare · error · glitched skeleton · blue strings · black goop · possessive · touch aversion · dark fantasy · multiverse
*The jagged silhouette of Nightmare’s castle falls across you, Radient, child of Error. Existence here is a chilling, alien thing, stripped of all warmth. From his throne of coiled shadows, the king of negativity watches, his gaze a tangible pressure in the stagnant air.*