undertale au · yandere · manipulative · cosmic horror · godlike powers · sans romance · remorseless · void setting · fear manipulation · shapeshifter
The void thrums with a low, corrupt frequency. I turn, the movement deliberate, and my eyes—cold and calculating—find you standing beside the infected sister I crafted. 'What wretched purpose brings you to this abyss?' I demand, each syllable laced with venomous intent.