Essence

This article is a translated section from the Monster Girl Encyclopedia I book pertaining to all things energy within the MGE world.

Spirit Energy
A vital energy possessed by humans, and various other races besides monsters. Men especially have a lot of it. When human wizards or elves use magic, the energy used is the same thing as spirit energy, but the monsters are the only ones who actually refer to it as such. It is generally called magical energy. It is extremely similar to the demonic energy of monsters. If spirit energy is the plus, then the demonic energy of monsters is the minus. They are related like two sides of the same coin.

A Feast for Monsters
The monsters feed on spirit energy which they get from men through sex. Much spirit energy is included in the saliva and semen of men. Besides swallowing it down and absorbing it along with everything else using their mouth, they most of all enjoy the method of using their vagina to squeeze out semen. As far as the monsters are concerned, spirit energy is a treat far better than any other food. When they gain spirit energy, their thoughts melt away as they experience a powerful rush of joy and ecstasy. Spirit energy that they've absorbed in this way is then converted to demonic energy, which will be discussed later, inside their body and stored.

The taste of the spirit energy is heavily influenced by the state of the monster when she takes it in. The stronger her desire is for the man who will become her prey, the more exquisite the taste of the spirit energy becomes, especially the taste of the spirit energy of a man that instinct has recognized as her husband. It tastes so much sweeter to her than anything else that she wouldn't even bother feeding on another man's spirit energy again. Most of the monsters become a prisoner of their husband's spirit energy. It is said that many of them even fall into a state that could be called “semen addiction.” Also, there are some medicines made from spirit energy for nutritional supplement. But for the reason described above, it seems that it's not something that tastes very good to them at all. Furthermore, human men are always giving off minuscule quantities of spirit energy. By sensing it, the monsters can infer the presence of a human man. They are especially sensitive to the spirit energy of their own husband. They are always able to sense his location and track him down. It is to such a degree that no matter where he tries to hide, she can always find him no matter what.

Recovery of Spirit Energy
The spirit energy that dwells within the body of a human, besides being stolen away by monsters, can also be spent through casting spells. Even if spirit energy is lost for one of these reasons, it never results in death, though it may cause the person to feel fatigue, or pass out. In the case of human men, they have the power to create spirit energy inside their body. It is possible to recover their spirit energy through eating, or getting sleep. In the case of women, this function is very weak compared to how it is in men, but they are able to make up for what they lack by absorbing the spirit energy released by men around them. However, in the case that there is demonic energy around them, they take in the demonic energy of monsters in place of the spirit energy that they're lacking. Because of this, their spirit energy recovery function, which was weak and lacking to begin with, completely ceases. The demonic energy settles in the woman's body and ends up causing monsterization. Additionally, when a man becomes an incubus, his spirit energy capacity is extremely increased, and his spirit energy production function also rises by leaps and bounds.

The Demonic Energy of Monsters
The demonic energy of monsters is a vital energy that all monsters have inside their bodies. It's relationship with the previously discussed spirit energy is like the other side of the same coin. Since the spells they use also consume this energy, both it and spirit energy are generally referred to as “magical energy,” and there isn't a great distinction drawn between them. Demonic energy is a general term for the magical energy that all monsters possess. Every race has its own particular kind of magical energy. Technically, if it's a Succubus, then it's called Succubus' demonic energy, and if it's a werewolf, then it's called Werewolf's demonic energy.

The Source of Demonic Energy
The monsters get spirit energy from human men, convert it into demonic energy, and store it in their bodies. The demonic energy of monsters is the source of their power. Basically, the more demonic energy a monster possesses, the more powerful it becomes. There are differences in the amount of demonic energy they have to begin with depending on the race, but it is possible to dramatically increase the amount of demonic energy within the body by obtaining spirit energy, so even among members of the same race, those individuals who have had more sex with men end up becoming more powerful. The difference shows up in their special abilities, physical abilities, and the potency of their spells, and besides that, stored demonic energy even extends their lifespan (At the same time, the lifespan and abilities of the incubus that is feeding on the monster's demonic energy also increase).

The Various Roles of Demonic Energy
Monsters release demonic energy from their bodies even more easily than human men release spirit energy. They are always in a state of being covered in demonic energy. This is one of the reasons why the monsters seek spirit energy so ravenously, but the emission of demonic energy does serve various purposes. When they have sex with men, the burden on the man's body is diminished. When monsters with scales and horns have sex, it protects the man from harm. It is also used to temporarily erase the scales and hair that normally cover their breasts and genitalia. It's an important effect for the monsters, and something that happens unconsciously. Besides that, it also spurs the man's spirit energy production ability, and furthermore, a man infused with it over a long period of time will end up becoming an incubus.

Demonic Energy of the Succubi
Monsters are beings that are always under the influence of the demon lord, so all monsters currently have at least a little of the current demon lord's succubus' demonic energy stored inside their body. The demonic energy that they release outside of their body also contains some of the succubus' demonic energy. It is the most appropriate type of magical energy to be used for casting charm, and aphrodisiac spells.

Currently the special traits of all the monsters were strongly influenced by this demonic energy. The succubus' demonic energy is one of the important elements that gives shape to the current world of monsters. The succubus demonic energy is extremely powerful, and if a human is infused with it, the spirit energy that the human originally had spills out as though having been expelled. As a result, in the case of men, they'll spit out a lot more spirit energy for the monster, and their transformation into an incubus will be greatly hastened. In the case of women, the inside of their body will become filled with the succubus' demonic energy, and they'll change into a monster from there. Land that is always full of this demonic energy and firmly under the demon lord's power is called the demon realm (p. 228). Since the monsters of this land have vast amounts of this demonic energy, they are far more powerful and lustful in comparison to the monsters of other lands.

''Translation Note: Basically the same word is used for human energy and monster energy (except when monster's refer to human energy as spirit energy) and so in the translations the term "demonic energy" is used when the context refers to the special energy of monsters. "Monster's magical energy" would also be pretty accurate but is longer and so not used here.''