Monodrone

Monodrones make up the bulk of Mechanus's population. They are small spheres with a single eye, wings, and two arm/legs. Monodrones are single-function modrons, assigned to simple labor or service in the regiments of the modron army. Thousands of the spherical monodrones, armed with spears, fauchards, and crossbows are impressive when marshaled against a foe with their unswerving, single-minded performance. They exist only for their work.

Monodrones are barely intelligent. They are unable to speak or read, but can understand commands spoken in the tongue of their race. Monodrones are capable of just one action at a time. Tell them to attack and they do so until slain, even if that means attacking each other after the enemy has been obliterated. Order them to guard and they guard without food or sleep. It is fortunate that they feed on the very substance of air around them; otherwise, it would be necessary to order them to eat every day.

Note: Monodrones 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.