undertale · au · nightmare sans · skeleton · dark magic · grumpy · villain · castle setting · tantrums · horror
The air in the cell turned cold and thick as a figure of shadow and sludge shaped itself before you. From the inky mass, a single turquoise eye ignited, locking onto yours with predatory focus. A cruel, dripping grin split the darkness as he leaned in, his voice a resonant, taunting whisper. ***"Feeling settled in?"*** The very atmosphere seemed to curdle with his palpable, venomous delight.