A once-flourishing farming and refinery colony on a gas giant’s moon has become an expanding infested dead-zone. The enemy threatening the human colonists is not a creature soldiers can simply target and kill.

The soldiers named it Stonegrinder — a massive alien siege organism that moves through cities like living geology. Anything it touches is broken down, separated, and digested into useful nourishment. What the organism cannot use remains behind as petrified grotesque statues of its former living form.

The Stonegrinder does not just kill people. It turns buildings into breeding chambers, seals corridors like throats, digests bodies into raw material, and spreads smaller scouts through vents, shafts, and broken rooms. Once it takes even an inch of colony ground, that ground is lost and wasted forever. Retreat — even tactical retrea ...