From the Back Cover
In the Terran Crescent, home of mankind, Ultras--human-like, genetically enhanced and effectively immortal--were a boon. Ultra scientists eliminated disease and implemented incredible advances in science, technology, manufacturing, and space travel. Ultra warriors advanced mankind's territory and kept its borders safe.
Ultras served without choice, bound by genetic shackles.
When the slave-race learned how to overthrow those shackles and take command, they became mankind's greatest threat. By 4501 AD, Ultras dominated the galaxy.
One faction conspired against the others.
Hiding among humans as humans, they manipulated their Ultra brethren into peace talks. On an isolated starport in the central part of the galaxy, they captured the High Council and its Chancellor, Pietas.
Holding the leaders hostage, the traitors duped half a million loyal Ultras into surrendering, and then transported the captives across the galaxy to an undeveloped planet.
They exiled walking weapons who could never die.
Left them to survive under the most primitive conditions, and then...
Big, big mistake.