So this thing's actually for serious. Fair enough, I guess it can become interesting, and pave the way for previously unconceivable situations - see: humans and Nomads ganking upon these guys to wipe them out - but I'm still wondering what kind of infection we're talking about.
Is it like a forceful assimilation in their Mindshare?
Hell, is there even some physical contact and mutation involved or is it like a computer virus?
Also, you said that they control an entire sector, which makes me think that they must've completed something akin to the learning process the Dom'Kavash meant for the Nomads of Sirius.
Do they actually have some sort of sophisticated culture or are they just space monsters? Like, is there an actual civilization back in this Aurora sector, with some cultural depth to it, or did it just poof the moment this sort of virus appeared?