Needless to say human blood was the Nobility's----vampires'---source of sustenance. This supply, collected both willingly and unwillingly from the local population, not only sate the Nobility's appetites, but also filled frozen or otherwise dried and pressure-packed storage units scattered across the land.
A year's worth of blood was typically kept on hand in any Noble castle.
As long as the Capital are supplied with blood tribute it demanded, the overseers are given complete administrative control over the Frontier called Absolute Managerial Rights .