Planescape: Dark Mirrors
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Tridrones appear as three-sided pyramids with spidery arms and legs. They supervise squads of 12 duodrones, who in turn pass their orders to the monodrones. Tridrones can carry out multiple-task projects on their own. Typically, they receive a general order, which they divide into smaller tasks to be fulfilled by the duodrones. In the modron army, tridrones serve in special companies, equipped with three javelins per being, which they hurl before entering melee.
Tridrones are capable of reporting actions and observations and actually planning limited objectives on the battlefield. They speak their own language and the trade tongue of the multiverse.