They were clearly a "second-class" group situated between the ruling vampires and the commoners, despised by many but envied by even more.
Because the vampires belonged to the Eternal Species, in selecting new Armed Blood Servants they tended to favor those human descendants who had served the Blood Vulture Clan for generations. This once again reinforced the pact among the Blood Servants, resulting in nearly all humans who could become Armed Blood Servants 400 years later being born into families of staunch Vampire Worshipers with "pure roots."
These individuals were not only the main military force of Transylvania in the past, but also the most critical means for the Blood Vulture Clan to maintain their dominion.
With this issue in mind, one could understand the difficult choice now facing Maxim.