Blood Rage

Blood rage is a genetic illness that affects vampires. Blood rage can cause loss of control and violent impulses. It may be triggered by strong emotion, such as rage or fear. It also has the surprising characteristic of making a male vampire potentially able to father children biologically with certain types of female witches called weavers.

Vampires suffering from blood rage have sometimes been able to develop more control over their symptoms over time, especially when provided a supportive environment.

It is not stated as to how a witch with daemonic DNA in their blood will react to the change, seeing a witch with daemonic DNA is a Weaver, a special type of witch that is capable of bearing children with a vampire who has blood rage.

Past
Prior to the events of The Book of Life, any vampire known or suspected to be suffering from blood rage would be put down, along with their sire and children. Blood rage was viewed as uncontrollable, leading to the view that the only way to deal with the problem was to eliminate all affected vampires.

Cause
Blood Rage is caused by a genetic anomaly in the Creature Chromosome of Vampires. When a Vampire carries this genetic fault they will pass it on to all of their children. Blood Rage can be inherited but not expressed by said children leading to Blood Rage hiding in vampiric families for generations without a child developing the symptoms. The Blood Rage gene will only express symptoms if Daemon DNA is present in the human that was reborn into a vampire. This means a Vampire could turn a Daemon into a Vampire without the Daemonic Vampire developing Blood Rage as the sire must already possess the Blood Rage Gene inherited from their maker.

Ancient vampires seeming knew of the dangers of turning Daemons into vampires due to the possibility of the maker silently carrying the Blood Rage Gene. Therefore, turning Daemons into vampires is strictly forbidden under Vampire Law. Seemingly, the more Daemon DNA present in the new vampire will cause Blood Rage symptoms to become worse such as the case of Jack Blackfriars who, according to his DNA test results, processed far more genetic markers that activated the Blood Rage Gene making him act more violently and react to a greater spectrum to stimuli that triggers his Blood Rage. This would mean that a pure-born Daemon who is turned into a Vampire by a sire with the Blood Rage Gene will be almost completely consumed my the symptoms providing another reason siring Daemons is strictly forbidden.

Connection to Weavers
The reason a vampire with blood rage and a weaver is able to conceive children is because weavers are witches whom also have daemonic strands of DNA within their genetic makeup. Because both creatures share this genetic makeup, and both of these creatures also have the 24-pair chromosomes, they have the ability to conceive children with one another. Nathaniel and Sophie Wilson's daughter Margaret Wilson, whose daemon mother was born from witches, and whose father is a daemon, will thus be a weaver like Diana Bishop-Clairmont.

Known sufferers

 * Matthew Clairmont
 * Louisa de Clermont
 * Benjamin Fox
 * Jack Blackfriars
 * Ysabeau's maker
 * Ysabeau's Siblings
 * Marcus Whitmore's descendants

Known Carriers

 * Marcus Whitmore
 * Ysabeau de Clermont
 * Ransome Fayrweather
 * Marcus Whitmore's other descendants
 * Louis de Clermont
 * Janet Gaudi Sr.
 * Janet Gaudi Jr.
 * Andrew Hubbard
 * Andrew Hubbard's other children