IS-0173, more commonly known as the Pest is a hostile creature found in the Facilities that is originally from Anteverse II. It is a rather small creature, taking the shape of a spiked potato or bread loaf, and is the most common creature encountered. It prefers to hide in various nooks and corners to ambush it's prey, be it under desks, in vents, or behind boxes.
It is believed to be the second evolution stage of the Carbuncle, with it eventually evolving into the dog-like hunter known as the Peccary.