I think it would be nice to have spaceborne aliens in most of the empty stars and maybe missions about them?
It is pretty similar to;
Star Trek movie, Crystalline Entities...
Stellaris, Automated Dreadnought,Void Clouds,Dimensional Horror,Ether Drake,Ancient stuff...
and many other stuff
It will be nice content for players who want to explore and encounter a terrifying space monster. Of course you will need a fleet,different tactics etc to take them out and player should be rewarded with a unique stuff so that can be a weapon,hullmod,fighter/bomber...
This can be end game content or mid game content but it should not give you too much advantage over any enemy fleet and maybe AI Fleets with the stuff you got from the thing you destroyed should spawn rarely?
Like if you get a unique hullmod or a single weapon from the space alien you kill, there should be a chance of encountering with an AI fleet having the unique hullmod or one of the ship with unique weapon. So then things will be equal like that
So what do you guys think?