With the help of metal needles possessing great penetrating power, the creatures of the swarm achieve direct attacks on the structure of enemy units, bypassing the shield. As a result of discovering the properties of metal, the Overmind understood how to reduce the area of the needle projectiles' tips so that they could penetrate deeper into the structure, inflicting greater damage. Increases the attack strength of Hydra, Dreadlisk, Pancor and Needle Tree by 5% per level.