This creature looks like a massive centipede with a bright, reflective silver carapace. Its legs are dull silver and its oversized mandibles are black. A dull black stinger is located at the rear of its body.
By rapidly vibrating its carapace, a chain worm emits a high-pitched trilling sound that stuns and deafens all creatures within range. All living creatures within 30 feet that hear it must succeed on a DC 22 Fortitude save or be stunned for 1d4 rounds and deafened for 24 hours. The save DC is Constitution-based.