The Black Ship — Christopher Rowley

DEADLY DISTRACTION

After the War for Eternity, the Arizel aliens appointed the Highland Clans of
Fenrille to lead the planet's defense.

But just fifty years later, Fenrille was under dual attack--not only had a wayward son of the Fundan clan revolted, but The Black Ship, a huge spacecraft from Earth, was attacking clan strongpoints from orbit, hoping to fill her stores with stolen longevity drugs before fleeing to hide among the stars.

And, distracted by the deadly combat, hardly anyone took notice that the universe was in deadly peril...