Echoes of Reality - Kevin Fitzpatrick - Bog

When interstellar probes land on Earth 2,000 years ago, an unlikely Roman legionnaire stumbles upon one and finds himself the last refuge for humanity in an interstellar war. Lucius, enhanced by the alien technology and seemingly immortal, allies with the alien AI in its quest to save mankind.
Lucius wanders the Earth over the millennia, preparing and searching for those who will ally with him before the final conflict. A French priest, a Viking shield maiden and an Irish immigrant make an unlikely team as they confront their enemy, the secretive Obsidian House.
Echoes of Reality is filled with technology that mimics magic, ancient sword fights and modern clandestine assault teams, secretive orders and an insidious evil that takes shape through history. Soon, Lucius and the team find themselves beset by a new adversary who has allied with Obsidian House. Before long, the final battle takes shape and time is running out for the preservation of humanity.