A blade trap in the tunnel halls that triggers on nearby movement and has already killed one sluggalo.
The proximity scythe is one of the traps Justice Light installed in the tunnel network beneath the ninth-floor base. It fires on proximity rather than contact, making an entire hallway lethal to anything that wanders in, and it does not distinguish friend from foe.
It killed Lickity Spit during construction, an incident the sapper crew clearly remembers. When Sneaky Tyler C led the Sluggalos toward the surface, he started down the wrong hallway and Justice had to shout him off it — 'You'll set off the proximity scythe! Remember what happened to Lickity Spit!' Tyler C's response was an unrepentant 'Oh, fuck. My bad.'
An unseen blade mechanism concealed in a tunnel hallway, sensing anything that comes near.
A signature hazard of Justice Light's tunnel defenses and the crew's standing cautionary example.