Moving in a corkscrew pattern, the ice wyrms of Barton IV traverse the snowy terrain by tunneling underground and burrowing toward their prey. Hardened shells provide a protective barrier from the elements and would-be predators, while a series of blowholes allow the wyrms to breathe when breaching through the surface, using their snapping jaws to grab at their target. But well-placed sensors emitting a high-pitched frequency have proven successful in keeping the beasts away from the rare depot or encampment.