Mass Effect & Mass Effect 2
Armatures are quadruped all-terrain heavy weapons platforms, akin to armored fighting vehicles of other races. Geth being synthetic intelligences, armatures are not crewed vehicles, but intelligent entities, capable of independent decision-making and learning.
Armatures are equipped with heavy kinetic barriers. Their main cannon, mounted on the articulated 'head' turret, appears to be a highly efficient conventional mass accelerator. It is capable of firing in anti-personnel and anti-tank modes. Some armatures carry drones into battle, presumably for reconnaissance purposes. Other host a swarm of insect-sized repair microbots.