@Lmpkio
Even if it wasn't a rule, I think asking the Sith Emperor permission to use his Empire is just good sense. I think we all know how he reacts to people usurping his authority.
Oh, it's fine. Valkorion won't like it but he'll "understand".
You do realize that the Eternal Empire and the Galactic Empire are two different empires right? I mean, what's happening within the SWTOR game is basically an AU thanks to Disney, which likely ruined any canon connections Bioware could have made to the main series.