The Bloodseekers.  Of the Warrior Clans the Bloodseekers are hunters and law-keepers of local lords and enforcers of the status quo. The Bloodseekers enforce law among other vampires feeding off the lawbreaker, poacher, and rebel. 

Bloodseekers feed off the blood of other Vampires. Bloodseekers never truly die so long as some of their clan exists, the blood of a Bloodseeker can revive another from mere ashes. They regenerate rapidly when exposed to blood. Seekers can sense other vampires, see an outline of their heart, and sense motives. Seekers are immune to all Vampiric abilities and can change the composition of their claws to various metals. When given a lawful order the Seekers have a karmic sense of where the culprit is. They do require something of the culprits for more pinpoint locating. 

The Bloodseekers are more vulnerable to Siger’s light. They also can’t refuse the orders of a First Son. Seekers are especially vulnerable to magic making them vulnerable to the Aristocratic Clans.