The Overmind knows that complacency is the road to defeat, and it works constantly to further evolve its children and make them more efficient killers. The Evolution Chamber provides a testing ground for the Overmind to manipulate the genetic code of its lesser spawn, gifting them with enhanced physical abilities.

• Upgrade Melee Attacks. This evolution enhances the natural weaponry of the Zergling and Ultralisk.

• Upgrade Missile Attacks. This evolution enhances the natural weaponry of the Drone, Hydralisk and Defiler.

• Upgrade Ground Carapace. This evolution enhances the natural defenses of all ground-based minions of the Swarm.