So... humans from Aless founded an empire called "Starveek," it spread out to the stars; as they are spreading further and further, something, some catastrophe, on the long-forgotten home-planet happens...?
And the thing that happened was magic, maybe?
And it whomps technology hard enough for a warship to lose most of its crew, so it would've been bad on the home-planet, I'd think.
I'm just high and thinking; high-pothesizing, if you will...