[Paul1980au]

They could be spread across the game as another element - although the rare element is more favoured.

ALso id like alien relic ships (you enter certain sectors - perhaps with the first scanners you get - uncover a special ship that has advanced weapons or something - cant be anaysised - but it can be staffed and part of a fleet but on say a 300 system map there would be only 10 in the game - and once destroyed would not be able to be recovered

Or space monsters that can be captured during combat and made do youre empires bidding.