Primal drones are a breed of primal zerg that gather minerals and help summon larger primal zerg creatures. They are among the lowest of a pack of primal zerg, and exist in a tenuous position, as the strongest members of a pack will often feed upon them if they require additional nourishment.
Primal drones are the worker units foe Dehaka in Co-op Missions. Unlike normal drones, the primal ones doesn't morph structures, instead sacrificing themselves as a lure to summon primal zerg buildings. They can't summon extractors, because only the primal hives are able to spawn these buildings directly. Also Dehaka can devour these workers while respawning in Dehaka's den to reduce his revive time.
Increases the armor of all primal zerg units.