On the Ashen Shelf, centuries of industrial polymer waste have hardened into an unstable advance route above a vast Chiselback burrow network. A four-man combat engineering detail escorts a harmonic surveyor across the dead processing quarter to locate nursery cavities and plant seismic charges before an armor column moves in at dawn.

The Chiselbacks undermine roads, trenches, and defensive positions, then collapse the surface beneath anything that creates enough vibration. Inside their resin-lined tunnels, blood, bodies, and spilled organic matter are absorbed into living walls and used to grow new excavators and chambers.

This is "Chiselbacks" by Sascha Schmidt