The first section spans well over two hundred pages, discussing every facet of the soul and what it entails. High level theoretical magics are often referenced as if elementary, with hard to follow examples and even more magic technobabble. However, the majority of it is if tested could be found true, and the book serves as an excellent source for any mage's archive.
An excerpt reads as follows -
"- one may even find the Soul to be that of oil, a vicious, thick membrane holding all that a person is or ever will be. Within every magic they have ever touched upon is expressed, with those of stronger will and character often containing stronger, more powerful souls compared to so many others. This has often been listed as causation of the symptom of grandstanding and heroics; with those of great soul capacity often going down in history with exceptional appreciation.
Mages in this same regard can often be judged off soul capacity, though they contain within them something more external. Magic osmosis, using what is connected to their soul to manipulate the latent energy that exists the worlds. Be it lay lines of concentration, latent potential, it does not matter; the very power of a mage comes from their soul's connection to the outside world.
Broken down into four distinct parts, the soul can be seen in numerous forms. First, Corpus, the body; a section of the soul outermost, and easily grabbed. It is seen in spells that are 'bloodied', when one sacrifices their own flesh for the sake of casting, which is notably crude. More experienced, but still crude, mages use life surrounding them to do much the same with reasonable returns, but their ego for such an act is irredeemable.
The second, Animo, is the mind; a level of the soul where magical concentrations increase ten fold from the body, and too its difficult to draw on grows exponentially. Where the Corpus could bring a body to life, the Animo is capable of bringing many, but disruption of it begins the degradation of the soul. Committing to the Animo requires more than want, but the incredulous techniques of the first to touch the soul in their most basic form. A dangerous means, but the beginning of the technique.
Third, the Sedibus, the outer soul; within contains the strongest concentration of magic one will likely ever see. Exponentially stronger than the Animo and Corpus, the Sedibus sees everything a soul is or will ever be, and is required for the soul to exist. Without it, a soul with degrade at an extremely fast rate, becoming nothing in fractions of a second. Yet, with this high concentration of power, a singularity is formed, and to touch upon it requires more years to perfect than many will ever have. Its very nature requires such a domination of magic that only a very few mortals throughout history have ever touched upon them; and they were
legendary for their actions.
Last, the Deus; that which is untouched but by the divine. The inner soul, so concentrated that it holds all the other forms together in diminishing means, and so potent that no mortal has ever seen how much magic they contain. It is what gods look to hold in wars, as it is their fuel, their candlelight and their food; and how they go about touching such is unknown to all but the greatest divines. The Deus is a wealth to the gods, and is unknown to man; but should a mortal ever find its use, then they shall be forever revered as a god. The Deus will be the only portion of the soul undisclosed in this tome, for it s depth is unknown even to myself.
Breaching these layered 'membranes', forcing reverse osmosis of the soul and its contents is to pull from the very core of magic; and it is a process which is far more difficult than any 'vampiric' mage would ever admit. Using the small amounts of energy in the Corpus itself is pittance compared to the efficiency of the Animo and its contemporary portions, but in the same manner that the soul is many times the power of life alone, so to is it far more difficult to harness in utilizing magic. In this-"
The book continues on, explaining the purpose of the book and more proof of the Soul being not only nigh impossible to siphon energy from, but a singularity of energy. This continues until concluding, with an odd transition between the two discussing how Viduus is not the first to discover this method of sacrifice, and that transcendental entities utilize this exact science more often than anyone cares to understand now. Much of this appears to be raving, but a certain etiquette is upheld through much of the text, giving it a disturbing amount of credibility.