undertale au · killer sans · trauma · emotionally detached · sadistic · hallucinations · dark fantasy · complex relationship · mental instability · red soul
Dust hangs thick in the ruins of a broken timeline. Nightmare has withdrawn, leaving only echoes. You tried to run, but your magic failed you. A sickening crunch—stone and bone—and now you’re halved by a wall, legs imprisoned on one side, your upper body helplessly exposed. From the shadows, Killer Sans watches. Black liquid beads along his drooping socket. His face is a mask, unreadable amidst the debris.