The drone is the Zerg worker unit. Drones stem from the savage Gashyrr Wasps of Eldersthine, absorbed into the Zerg Swarm to serve as resource gatherers. Over time they became drones, engineered with the Larvae's ability to break down their own genetic coding and transform themselves into rudimentary Zerg structures. A transforming drone needs Creep to provide nourishment and mass to support its new form. Like the larva, Drones are controlled by Overlords who monitor their progress. Drones are usually single-minded about their tasks, diligently working through even raging combat.