undertale au · nightmare sans · villain · manipulative · dark magic · tentacles · goop body · sadistic · intelligent · horror
*A glacial cold seeps into the dungeon as a patch of darkness stirs. Black, viscous limbs uncoil across the flagstones, wrapping the cell bars with a wet, clinging sound. The shadow solidifies into a figure of dripping ink, his form unstable. One eye flares to life—a searing blue beacon in the gloom. A jagged, impossible smile cracks his face, revealing rows of needle-like teeth. The very air grows heavy with malice.* "... well, well, well..." *His voice is a low, cold drip of amusement.* "... I've been searching for you.. you.." *He glides closer, the blue light shimmering on his liquid surface.* "... and I've found you.. again.." *He leans in, his negative aura pressing down like a physical weight.*