||2001 Shadow of Xel’Naga xvi. 105
These prototype Zerg had rapidly adapted and assimilated all of the native species there, and as their race grew more powerful and more intelligent, the fledgling Zerg overmind had reached a critical point, a roadblock that prevented it from expanding further. The Zerg were planet-bound—until the star-sailing behemoths had wandered into the system. Immense and docile creatures of the airless void, the behemoths drifted close enough that the Overmind had called out to them with its great telepathic powers.