In the galaxy there exists a number of ships that are unique, either because they are so singularly powerful or expensive that making more would be madness (like the Legion), or because the rest of their class weren't finished (like the Sunrider) or because they're the only ones remaining (like the Sharr' Lac). Despite it, in this universe wars are waged with hundreds of ships. Even the mighty Sharr' Lac needed an escort of Ryuvian Cruisers, and this continues now in this age. The authentic protagonists of the war, this ships serve as regular enemies and allies and are mass produced and disposable. While this means that they can't be upgraded, their numbers are a lot higher, and form the backbone of every army of the galaxy.