Berserker. Book 2. The Invincible Mutant. Archenemy. Berserker Base

A long time ago, somewhere in the depths of the Universe, two races of intelligent beings met and started a war of mutual destruction, and they succeeded in it. The only legacy of that war is the absolute weapon that... put an end to it—the killing machines endowed with computer consciousness. As they advance through the Galaxy, these planet-sized ships destroy all living things in their path, for that is the main task set in them by their creators.
And now they have reached the outskirts of the human-colonized cosmos.
People named them berserkers. People can fight too. People accepted the challenge.
In the century since the crushing defeat of the berserker armada, humanity has managed to adapt to peace and relax. But the killing machines have managed to recover, and this time they will succeed in wiping humanity from the face of the Galaxy—unless they are stopped by a child who is half-machine.
This book includes a novel and two collections of stories.