Duodrone
From Ardrana
Duodrones are bifunctional modrons that supervise 12 squads of monodrones or perform complex tasks beyond the abilities of the monodrones. They are blocky, rectangular creatures of great strength. Like all modrons, they are absolutely loyal to the commands of their immediate superiors.
Capable of interpreting two commands at once, duodrones serve in the forces of the modron army of Mechanus as corporals and sergeants, or as special shock troops armed with thrusting and crushing weapons. Typically, they are given only a single command at a time, allowing them the limited ability to react. If ordered to attack, for example, they will do so until the enemy is slain and then seek out a new enemy, rather than attacking each other. Duodrones have limited conversational ability, but they can report their operations and observations clearly and completely.
Note: Duodrones originally appeared in this form in the Planescape AD&D campaign setting from TSR. Their use here is for the purposes of providing context for the campaign only.