[quote=@Hael]

-My nation almost always uses disease-based weapons on planetary attacks, which your nation would be immune to. That is unbalanced.

[/quote]

I have a question about this. They're not some kind of magical diseases that are somehow able to infect any aliens, are they? I mean, do you use cocktails of different diseases that specifically target certain races or even diseases that are specifically engineered to infect multiple specific hosts? Because I don't think that, for example, any of your diseases would likely be able to infect a species you haven't had any prior contact with (or whom you haven't had the chance to study the biology of) simply because pathogens don't really often cross species boundaries like that.