True Vampires: Blood-Sucking Killers Past and Present

This book is about modern Vampires (Sanguinarian, Psychic Vampires) that are murderers & cannibals & committed crimes/murders.
The woman on the cover of the book is a German woman named Manuela Ruda she is a Sanguinarian Vampire/a Satanist and she sacrificed a man with her husband at the time Daniel Ruda (they are divorced)
They were both a Sanguinarian Vampire & a Satanist that believed if they sacrificed someone to Satan that it would please them.
Both lived a alternative, Goth/Satanist lifestyle, they slept in a coffin & drank human blood.
Both are delusional & mentally ill, a lot of people mentioned in the book will fit that category.
There is a mental illness known as Clinical Vampirism
(A.K.A Renfield's Syndrome) and it involves people believing they are a Vampire & need to consume blood to survive.
They are obsessed & addicted to drinking human/animal blood.
The mental illness called Cotard's Syndrome that involves people that believe they are already dying, dead & decaying despite still being alive, or that they don't exist it's bizarre.
The medical condition Porphyria a rare blood disorder that affects the skin, digestion, make the skin very sensitive to sunlight & that involves people needing to drink blood of animals like pig's blood.
There is no benefit to drinking human blood, however blood contains energy, the lifeforce of a person, in a spiritual way blood is powerful, the essence of a person and it can be used for the purpose of witchcraft.
Cotard's syndrome- People appear dead but are actually still alive, their heartbeat becomes very slow, barely noticeable & they are buried alive which is terrifying.

Clinical Vampirism & Clinical Lycanthropy isn't talked about much, nor is the clinical/psychiatric or spiritual aspect of Vampirism, Lycanthropy or Cannibalism.
There hasn't really been a clinical/psychiatric analysis of Cannibalism, the spiritual aspect of it or any type of analysis of Cannibalistic murders/occult crimes. Some Cannibals consume the brain of a Cannibalized corpse which leads to them contracting a disease called “Kuru” which is fatal within 2 years & it's similar to Mad-Cow disease.
This is the only book that has mentioned Clinical Vampirism, mental illnesses & delusions some people have about being a Vampire a blood-fetish, obsession or need/urge to drink human/animal blood or cannibalize human beings.
People are delusional, a narcissistic, attention-seeking, pathological liar that would say/do anything to impress people or to brag.
Satanists practice Ceremonial, Solomonic or Goetic magick, they develop a bond/connection with overtime with the devils, demons, entities, spirits, beings that they invoke.
Devil-worshippers automatically assume everything they think they know about Satanism is in films, music, books (it depends on the books, grimoires) that they read, or that just because they own the Satanic Bible & they claim to be a “