Magic Circuit

**Magic Circuits** (魔 術 回 路, *Majutsu Kairo*) are a pseudo-nervous system that spreads itself through the human body and what qualifies a person to be a Magus.

They have two basic functions; one is to convert Life Force into Magical Energy and another is to allow their owner to access **Greater Magic Formulae**, that is, Thaumaturgical Foundations.

They also are paths that connect the material world to the astral plane. To perform Mysteries, a Magus sends a command and Magical Energy to a Thaumaturgical Foundation through his Magic Circuits and activates one of the **Magic Formulae** included in the Foundation as if someone switched a computer on and sends it commands to run a computer program.

## Mechanisms

Magic Circuits reside within the Magus’ Soul, and what is found on the body is just a physical expression of them that stretches itself throughout the body in a fashion similar to the nervous system.

They are composed of core components, which are the actual Magic Circuits so to say, and bypasses that connect those components to the brain. Magic Circuits do not change and once damaged they cannot be repaired.

Because organic activity is necessary for the operation of Magic Circuits, it is a common mistake to think that they are literally a part of the Magus body. There are rare occasions in which the Magic Circuits continue working even after the practitioner’s body has ceased all vital functions. In these cases, destruction of the brain is necessary to stop the Magic Circuits. Their Quality and Quantity are ranked through letters like Magecraft, and their Composition often varies between magi.

Like any other organ, the number of Magic Circuits that one possesses is determined at birth and cannot decrease or increase naturally, meaning that those from older lineages will be more powerful, but it is possible to change that number artificially through a number of methods. One of those methods is through the establishment of a mystic pass between two magi from which the Magic Circuits can transferred. As the Magic Circuits are located in the soul, a fusion of body and mind is required during the transplant. However, the process carries the same risks and complications as a transplant of organs. Furthermore, as the Magic Circuits become unstable if tampered while in use, there is a possibility of mutual destruction if a contract similar to that between a Magus and his familiar has not been established beforehand.

For that and other reasons, lineages of magi seek not to tamper with the Magic Circuits of their members while they are alive, but rather try to produce descendants with the greatest "extra" number of Magic Circuits possible. Note that number is not everything, and quality and precision of the Magic Circuits are also an important factor that differs from lineage to lineage. The Aozaki bloodline is known for producing magi with a low quantity of Magic Circuits, but the great quality of their Magic Circuits is more than enough to compensate for that. Meanwhile, the Barthomeloi possess a powerful brand of Magic Circuits known as **Blue Blood: Noble Magic Circuits**.

A normal person rarely acquires Magic Circuits but in these cases they are considered as sudden mutations.