From BrWiki
Characters that are not scions are termed unblooded. This means simply that the power of the old gods does not flow in their veins. Unblooded characters form the vast majority (over 99%) of the population, even in races where scions are relatively common such as goblins.
Unblooded people are the norm at all social levels except the very top, a scion is simply somehow more glorious than an unblooded even if the scion is not a regent, it is not uncommon however for unblooded characters to be generals, wealthy merchants and therefore have significant influence over the world around them. It is not impossible for an unblooded person to become a regent, just very rare. Although the Vos are typically considered savages they are in some ways very egalitarian, an unblooded person who proves themselves a great warrior is likely to be made a scion via usurpation or forced blood inheritance by the priests of Belinik or Kriesha.
An unblooded person can become a scion via usurpation, or blood inheritance.
