If a human drinks vampire blood, that human becomes a renfield. Higure has said that a human becomes a vampire when a vampire drinks that human's blood and the human then drinks the vampire's blood. It is not clear how Misaki did this to her assailant in volume 1, or how Kairdolf does it to Misaki in volume 5.
When a vampire turns a human, that vampire is referred to as the "blood parent" of the newly-born renfield or vampire.
"Straruda" is what is within the blood of each vampire which makes him or her a vampire. Each vampire's straruda possesses its own "will" and special properties, and contains the primal nature of vampires.
The more a vampire lives through serious injuries, the more he or she will want to drink blood, and the stronger the straruda will become, eventually causing that vampire to lose all memories and the personality he or she had as a human.
Vampires cannot go out under daylight. They do not physically age, and seem to possess increased speed and healing. Normal injuries, such as a broken neck, will not kill them. An "aruhiek" (elder generation vampire) such as Higure is much more powerful than an ordinary vampire. Vampires have an intense thirst for blood which requires them to consume it regularly, and must do so to survive when they are injured and lose a lot of blood. They possess fangs which allow them to drink blood from humans, but can also, as Misaki does, drink blood from a glass.
They possess a power called "farumek" that is similar to hypnosis which allows them to temporarily verbally control humans through eye contact. For instance, a hostile vampire once tried to use it to make Kuroe stab himself, and Misaki could have used it to make a man let her inside a club to see Sly.
They can also use "absorbire" (vampire cannibalism) to drink another vampire's blood and absorb that vampire's straruda. A vampire who consumes a straruda is influenced by it. To an aruhiek with a thick blood line, absorbing a straruda would at most alter his or her personality, but younger generation vampires with a thin blood line may be taken control of by the straruda and become half-crazed. A vampire which consumes another vampire's straruda will be able to satisfy that vampire's renfields' blood ties and serve as their blood parent, and could possibly obtain the special powers of that vampire.
Some vampires belong to the "Einseigrad Sparuda", called a guild of assassins.
A renfield possesses partial immortality but loses his or her will and is loyal to his or her blood parent: the renfield's feelings and memories are influenced by the blood parent, according to the strength and skill of the blood parent. Renfields often do the work of vampires in the day, when vampires cannot. Maria was severely conflicted by her first blood parent's command to kill her biological father, thus he survived long enough for Kuroe to intervene. Higure could completely control Maria, but chooses not to.
If a renfield is completely separated from his or her blood parent, he or she will experience extremely intense pain. Only a vampire of the same blood line, or a vampire which possesses the same blood as the renfield's blood parent by absorbire, will suffice as a substitute.
The "adivuarat kurai" (eyes that see the truth) are an ability possessed by a certain vampire and his blood clan. That vampire injured Kuroe's eyes, and ever since his eyes healed from the injury, Kuroe has been able to see differently. In particular, his eyes will always recognize the living undead which pretend to be humans. He is also immune to farumek. The term is used as if it were the name of that certain vampire, who was once the head of the Einseigrad Sparuda.
Patent Issued for System for Monitoring the Pressure in a Blood Line and a Device to Be Used in Such a System
Aug 30, 2012; By a News Reporter-Staff News Editor at Blood Weekly -- Fresenius Medical Care Deutschland GmbH (Bad Homburg, DE) has been issued...
WIPO PUBLISHES PATENT OF GAMBRO LUNDIA FOR "A METHOD AND A DEVICE FOR MONITORING A STATE OF A BLOOD LINE IN A MACHINE FOR EXTRACORPOREAL BLOOD TREATMENT" (ITALIAN INVENTORS)
Nov 25, 2011; GENEVA, Nov. 25 -- Publication No. WO/2011/135427 was published on Nov. 03. Title of the invention: "A METHOD AND A DEVICE FOR...
US Patent Issued to Fresenius Medical Care Deutschland on Aug. 14 for "System for Monitoring the Pressure in a Blood Line and a Device to Be Used in Such a System" (German Inventors)
Aug 21, 2012; ALEXANDRIA, Va., Aug. 21 -- United States Patent no. 8,241,237, issued on Aug. 14, was assigned to Fresenius Medical Care...
Wipo Publishes Patent of Fresenius Medical Care Deutschland and Martin Lauer for "Medical Port, Blood Line for Use during an Extracorporeal Blood Treatment and Medical Treatment Device" (German Inventor)
Feb 13, 2013; GENEVA, Feb. 13 -- Publication No. WO/2013/017247 was published on Feb. 7.Title of the invention: "MEDICAL PORT, BLOOD LINE FOR...