恐物=komono
黑白无常 was a pair of komodo dragons that dwell in the tunnels. The luminescence markings on one of them, on its back, locks like a skeletal figure. Running at you, on the ceiling, it will look like a ghostly apparition. Its mouths will open naturally on top of the eyes, at the top of the skeleton, because the perspective is from below the lizard on the ceiling head first, looking at its back. The other lizard, totally black, exit through another opening further in the tunnel, doubles back and blocks off the entrance to the tunnel.
No escape.
‘无常’ could be a local dialect meaning the big lizards that mimics the sound of a crying child.
Non sequitur...
