Rockbreaker (Horizon Zero Dawn)

The Rockbreaker is a machine in Horizon Zero Dawn. It is a large Acquisition Class machine, and one of of the largest known machines. It is unique among Acquisition Class machines and machines in general in that it is the only known machine capable of subterranean ambulation. Its main purpose is the underground mining of mineral resources. However with the onset of the Derangement, its huge size, power and subterranean ability have been turned toward attacking any human it senses walking the ground above it, with lethal results.