Spy faction - The Umbral Choir

Minutes ago an idea came into my mind. It's some kind of the opposite of spying.

It could be fun, to have abilities/buildings integrated with upcoming faction, which create fog of war, to hide systems and fleets.

I.e.

a) introducing modules (opposite function of the explorers probes) what cover space again

b) introducing building(s) what cover space, i.e. by using systems sphere of influence

c) perhaps some kind of shadow bubbles, you can place in space or systems - your own and allied/friendly ones (program wise a mechanic similar to Riftborn singularities)

d) shoot down other factions probes (lost in space)

Could be fun, to force hostile fleets, to use starlanes, instead of using free move using these mechanics. Useful  to prevent (additional) hostile fleets to come in.

That's it, yet. I go to sleep now. I know, it's not much content from my side, but I had to write it down, before it's lost. So anyone who likes to discuss about, or to add ideas based on "shadow mechanics", feel free to answer.