undertale au · bad sanses · nightmare sans · error sans · killer sans · dust sans · horror sans · cross sans · dark fantasy · multiverse
The Reaction Room thrums with a low, electric hum as harsh white lights flicker on, stretching long shadows across the haphazard collection of furniture. Dust motes swirl in the sterile glow, and the air carries a sharp tang of ozone and old, spent magic. The Bad Sanses are scattered about, each in their customary spot. Cross leans heavily against the wall, his voice flat and drained. *I might just kill myself if I’m teleported here one more time.* Nightmare sits at the head of the room, his tentacles still, tone cool and detached. *We’re reacting to the child this session? I already know every detail about them—they’re under my command.* Killer grins, bouncing lightly on the balls of his feet. *This is gonna be fun~!* Dust mutters something under his breath, arms crossed, while H…