Virtuous Blood

"Oh, disciple of the virtue, you have journeyed far. Hear my voice, if you shall swear by the covenant, to become a hunter who hunts blood-addled beasts, a blade that shall hunt the foes of our own blood, Then I shall refine you, safeguarding your person with the power of hardship. May the good blood guide your way."

- Gottfried

Virtuous Blood is a Hunters Guild located in Bruma, whose duty is to hunt bloodthirsty fiends.

Overview
The Virtuous Blood is a Hunters Guild based on a former knight order with the same name. They are founded shortly after the downfall of the Dawnguards in order to succeed their will to purify the world. Being a former knight order, the guild behaves more like a paramilitary organization rather than a guild available to the public.

The beasts hunters from the Virtuous Blood are notorious for their brutal efficiency, vampires who have encountered with the Virtuous Blood and managing to survive would wish that they have been killed instead.

History
In the Fifth Era, Tamriel was freed from the threat of Dragons, as the Last Dragonborn has defeated and sealed the World Eater Alduin. However, peace never comes to Skyrim as the lust for blood is corrupting the world.

In every corner of Tamriel, there's always a beast lurking in a corner, about to drink blood from their hapless preys. Some call them vampires, others call them bloodthirsty fiends. And one day, the entire Riften was razed because the beasts wanted to eradicate the Dawnguard as well as destroying the evidences.

A group of hunters, who called themselves as the Virtuous Blood, resurged in the abandoned Mages Guild guildhall in Bruma. They begin to recruit the locals to become hunters, and specifically, beast hunter who would slay the bloodthirsty fiends and purify the world.

Arms Dealing
Being the direct successor of the Dawnguards, the Virtuous Blood possesses the technique of forging crossbows and silver weaponry, and they often sell them to independent vampire hunters for profit. They also produce silverware for ordinary citizens.

Beast Hunting
Being vampire hunters, their main duty is to eradicate all creatures feeding on human blood, as well as those about to become one. The Virtuous Blood, unlike the Dawnguards, are willing to prolong their preys suffering as a scare tactic to warn people not to become vampires. They are also willing to use questionable methods to seek out and hunt vampires, be it espionage or assassination. As a result, the members of Virtuous Blood are notorious for their brutal efficiency.

Contract Killing
Perhaps their primary method of gaining the budget to operate in the first place. Should they receive contracts about vampires appearing in town, they would lure the targets to leave the town and hunt down the said target outside the town. If the target still remain in the town, the hunters would then try to assassin the target with unorthodox methods, such as poisoning water with powdered silver, setting houses on fire and proclaim it's accident, or even kidnapping the mark's family members to bait them out.

Espionage Mission
In order to gather information, the hunters would employ their members to disguise themselves as various positions, be it city guards or prisoners, to collect information about vampire infestation. Sometimes they would deliberately befriend vampires only to slaughter them after finding their hideouts.

Interrogation
Sometimes, the hunters of higher rank would capture and interrogate vampires for information gathering. After the information gathering, the vampires locked in the interrogation chambers are often being used for crossbow target practices for new members, to remind them the fate of one who have been succumbed by the lust for blood.

Weapon Enchantment
The guild also provides weapon enchantment services for the locals. They specialize in enchantments tailored for hunting undead creatures.

Trivia

 * The Virtuous Blood's recruiting speech is very similar to the Blade of the Darkmoon recruitment speech from Dark Souls.