Conceived and created in crumbling Old World castles and chantries by the newly vanished Tremere antitribu and a few twisted Tzimisce sorcerers, the Blood Brothers are an artificially engineered bloodline of shock troops and servitors. The Blood Brothers are the dubiously successful result of extensive experiments in blood bonding, intended to create a cell of servants that thought and acted as one.
To some degree, the Blood Brothers are a hive mind, sharing the same conscious thoughts and experiencing their surroundings vicariously through other members of their individual "chapters," known as circles. This link allows them to work effectively apart from each other - the bloodline excels at coordinated combat missions and espionage, provided no one realizes what they are (which, due to their rarity and the difficulty of their creation, is unlikely). They practice an unusual, disturbing Discipline that allows them to "loan" their limbs to one another, heal their compatriots and even capitalize on their shared minds.
Blood Brothers commonly form exclusive packs, in which they undergo Tzimisce fleshcrafting to make themselves look exactly alike - the better to unsettle their foes. The bloodline is notorious for its lack of personal drive, which makes its members ideal servants; no master needs to fear the Blood Brothers' fangs at his throat. Unfortunately, the bloodline has very little creativity, and it usually lacks the ability to out-maneuver opponents or outthink them, which is a flaw common to any enforced conformity. This is not to say the Brothers are dull-witted or slow; rather, they do not possess much self-awareness.
Few outside the Sabbat have come in contact with the Blood Brothers, and fewer still have escaped to tell about it. Indeed, not many Sabbat have dealt with the Frankensteins, or even know about them. Blood Brothers have become increasingly uncommon in the modern nights, mostly due to the fact that the Tremere antitribu no longer exist to create new ones while the existing Blood Brothers have typical Sabbat rates of Final Death. Blood Brothers cannot Embrace (a fail-safe put in place by clever experimenters who had no desire to repeat the Gargoyle fiasco), yet they are vampires in every other respect, including the ability to create ghouls.
Background: The Blood Brother's background ceases to have relevance after his Embrace. Vampires of this bloodline become devoted entirely to their circle and sect, and all other concerns vanish. Tzimisce (and Tremere antitribu, in the past) usually select mortal families, gangs or other extant groups from which to create Blood Brothers, capitalizing on the conformity and camaraderie therein. Female members are exceeding rare, but at least one has been reputably reported.
Weaknesses: Blond Brothers may not Embrace - they must be created via Thaumaturgy or sorcerous rituals. Should a Blood Brother attempt to Embrace a mortal, that mortal simply dies, robbed of all her blood.
The Frankensteins also feel each other's pain. It tine takes damage, every Blood Brother of the circle suffers the same wound penalty for the next turn. Only the greatest wound penalty applies - if two are wounded, all members of the circle (including the less wounded one) suffer the largest penalty. This effect is not cumulative, though all members may feel wound penalties for multiple rounds (assuming one of their number suffers damage every turn).
Clan Disciplines: Fortitude, Potence, Sanguinus
Subject: Blood Brothers - Frankenstein(s) 
