Their technology is far in advance of current Known Worlds tech, but it is rumoured that some Second Republic technology actually exceeded the Vau in certain areas.
Their relations with humans have long been cold and distant, but recently there have more and more incidents of Vau Mandarins travelling to the Known Worlds, although no one knows if these are official visits or merely personal.
The Worlds of the Hegemony are hundreds, as the Hegemony is vaster than the Known Worlds. They are populated also by many alien species, as the Velek Zzum and the Manshogo. A few stellar charts have been leaked to the human space, which allow to know a little more about them.