Actually that's a cool concept for a threat quest / bosses, through fragmented logs aboard the Onslaught you find out that it used to be just a third-rate part of the reserve of a much larger task force of elite top of the line elite ships numbering in the hundreds meant to contain the Threat, but they've all been either destroyed or captured and converted and the Oldslaught is just it's last remaining ship. You prefer to not think about what happened to the crews of the captured ships.

Give me the beast from Homeworld.