1. How many planet killer death star things do the Shakturi get? I've killed two of the Shakturi planet killers so far. Are they going to keep on sending more until I wipe the Shakturi scourge from the galaxy?
Only two from my experience
2. The alliance, so the Guardians, humans and someone else allied with me as soon as the Shakturi revealed themselves and declared war. However the bug races did not ally themselves with the Shakturi. So the good guy alliance (Guardians, humans, the other race, my race, and some others I managed to bribe) are fighting the Shakturi. But are the bug races (Dahut and Gizurean) gonna join up with the Shakturi at a later date?
They usually join up sooner or later. I have fought them three times and in most cases, the bug races joined, with a few exceptions.
3. I read on another post that if you conquer the Shakturi homeworld you find ruins that give you some kind of advantage (prestige, tech, cash, whatever). For those of you who wiped out the Eurktah refugees before they reveal themselves, do you still get the ruins?
It was a long time ago, so I don't remember, They will either wipe you off the map, or you will win. In both cases, I have that this is the end of the long story of my Empire. Point being, it might not matter much once u defeat them.