Joshua M. Gennari says:
The Vampires where created from a genealogy created by myself and Christopher Hoard. As I worked out how they came to be I realized that an actual genealogy would come into play. This story has the normal Vampires or as I refer to them Still Bloods. But it also introduces several new kind of Vampire. Pure Bloods and Half Bloods. Each type of Vampire has a specific genealogy and abilities based on that lineage.