A Sourdre de Sang is the title of a master vampire who is powerful enough to be a master, or head, of their very own line of vampires. A sourdre de sang generates his or her own animating power, and also provides animating power for all vampires that share its bloodline or have taken blood oaths to members of the sourde's bloodline. A sourdre de sang is owed a duty of fealty by all vampires that draw power from its bloodline. The most notable are certain Council members within the Vampire Council. It is not required to be within the council to be a sourdre de sang nor is it required that a vampire be a sourdre de sang to be a council member, although, it is more than likely the vampire will not last long as a Council member if he or she is not powerful enough to have their own line.