The Firefly crew are contacted by an ancient race, And they want them to rob the Alliance! AU

After the loss of Earth that was, Humanity made a new start, a system hidden from the dangers of the Warp. Of course, some people had to stay, and formed the Imperium of Man. Now the Imperium has rediscovered the Terra Deus system, and has decided to reclaim it for the glory of the God-Emperor. Hooray for the first Firefly/ Warhammer 40K crossover! T for possible violence.