The name says it all. It builds the structures of the colony. It can climb on almost any surface with its spider like legs. It uses its other limbs and prehensile tail to carry building material. The frightening thing is that it'll use anything to build, including the flesh and bones of corpses, so when someone sees a structure of a colony It has only one attack, and thats its bite, so it's generally weak against other kaijus.

Its about 130 feet long and 80 feet high