themselves

on Earth was beginning to chip flint and perhaps make arrows. The berserkers' Builders had been arrogant and powerful without a doubt. But they had long since vanished from the stage of Galactic time and space, following the Red Race into oblivion, more than likely victims of their own hideous creations.
The metal war-machines that humans called berserkers were the ultimate enemy of everything that lived. The creators of those inanimate weapons were gone, but the weapons themselves raged on across the Galaxy, endlessly repairing and replicating themselves, improving their own design, and refining their killing capabilities in an eternal effort to accomplish their basic programmed