EXCALIBUR. THE SECOND HORIZON (en Inglés) - David F Shenton

The Venorans have fought the Korrathi for centuries, a war waged across the stars. Now they turn to Earth. Not for fresh recruits or soldiers in their prime, but for veterans in the twilight of their lives, men and women shaped by a lifetime of service, hard‑earned wisdom, and nothing left to lose.

What the Venorans offer is more than a second chance, it's a new life.

The discovery of an ancient being from Earth's forgotten past. A lost world circling a black hole. A starship older than human history, engineered to breach the walls between universes. Its secrets could end the war... if they survive.