It is discovered that Buffy has gained an Aurelian signature over time. First, with Heinrich marking her as his 'savior' and her dying and being revived. Next, with Angel marking her as 'protected' when she offered up her life's blood to save him. And finally, when she is marked as the 'mate' of William the Bloody. And, having slain Heinrich in fair combat and having defeated all challengers who were not her mate, that makes her the defacto Head of the Aurelian Clan; go figure. May all who oppose her might tremble.