Aetheria

So, I played around with regular games for a while to get a feel for the game before I went to play the campaign. I've gone through 3 campaign missions and into the 4th after I noticed something funny on the first one. The Drengin weren't building combat ships. They build a few constructors (Though from the picture of them while they were in orbit they "looked" like small sized ships), but no combat ships of any sort. When I played up to where the Yor come in, they, too, do not build