Murk was formed in the lower tunnels where fog never clears and sound bends strangely. The lab never intended for Murk to wander beyond those halls, but something inside it adapted to the shadows, learning to use the darkness itself as a weapon.

Murk does not speak. It breathes loudly and deliberately, letting guests know it is near while keeping its form just out of sight. The sound of air drawn in and released becomes a warning, a rhythm that twists the mind as much as the tunnels do.

It thrives in tight spaces. It corners slowly, forcing guests to move backward into darkness they cannot judge. Every step, every pause, is measured. Every shadow hides a potential threat.

Some say Murk is drawn to other presences of fear. It moves closer when whispers rise, when tension builds, when panic grows. Those who escape often say they still hear its breathing long after leaving Frightmare. Others swear the sound follows them, even into daylight.

Murk is patient. It waits. It does not hunt the way the others do. It teaches the halls themselves to fear, and anyone who enters them must learn the same lesson.