Entry 100: Moon Cell

Also known as the Holy Grail, Eye of God, and Divine Automatic Recording Device, it is a massive collection of photonic crystals within the Moon that comprises a giant supercomputer of sorts. Its existence was unknown to the average man until the 2030's. Besides the Moon Cell itself the parallel world in which it resides in is noted to have followed the same path as the prime universe until the 1970's in which the world's mana began to dry up. The Moon Cell's photonic crystals are shown to have been created 4.6 billion years before the Age of Man, making it a construct formed roughly 100 million years before even the formation of the Earth. It holds the Moon Cell Automaton, a large computer-like construct created by an unknown civilization one hundred million years before the existence of the Earth or the Moon. It has recorded everything that has happened on the planet since its formation, and it keeps the records much like Swirl of the Root. It is the oldest known object in the solar system, and it has watched the Earth since its creation. The exact formation of the planets and how the crystals were integrated into the moon is unknown, but scientists know it to be an observation device constructed by an alien civilization of non-human intelligent life.

The photonic crystals are crystals that, on a microscopic level, regularly alternates between layers of high and low refractive index. In this way, it is a substance that can control the transmission of light, making it a valuable material for a quantum computer using light. The giant photon crystal slumbering beneath the moon can be considered as a supercomputer of enormous size, incredible complexity, and immeasurable processing power that was created from such nanoparticles. Although most supercomputer development was abandoned in the 2010s in favor of shifting the focus to cloud computing, the processing power of the all-digital media on Earth combined cannot hope to match the capabilities of the substance. According to Twice H. Pieceman, the Moon Cell's core is made of the purest type of photonic crystal, a material that can act like the crystals used on holography to recording media.

The Moon Cell scans the entire Earth about once per nanosecond and compiles the results of its scan in its database. It is a pseudo-intelligent being that has the supreme ability to affect the outside world with its internal calculations. As an eye that observes the Earth, it acts as a database of human history that faithfully simulates all life on Earth and is capable of providing a definite prediction of the future. It is a processor with a massive memory that has recorded the habits, history, ideas, and even the souls of humanity. As it can also affect the outside world with its calculations, it has the power to "grant wishes." In this way, it can be thought of as a Pandora's Box that promises the next stage of evolution. It promises god-like power to those intelligent lifeforms who have become technologically advanced enough to scan the interior of the moon.

When it was discovered by the Conglomerate it immediately managed to hack into every computer system around the world and connect to them within two seconds of contact. This made all Internet security systems moot, as anyone could get into any other computer via the passageways through Moon Cell as long as they could connect to the Internet. To prevent individuals from reaching the Moon Cell, the Conglomerate prohibited all space travel. In order to determine who was truly worthy of using its power, the Moon Cell began the Holy Grail War, where "spirit hackers" who have hacked themselves into the .PH fight for the right to use the Moon Cell.

AN: The first thing whenever I think of Fate/EXTRA is the Matrix, given its virtual world and if you die in it you die in the real world not to mention the amount of hacking that is done in the series. Anyway, in the last chapter I said that I would be making an announcement and here it is. This will be the last entry for the Codex of Heroes. Now let me explain, with 100 entries already posted [technically 101] I decided to break the Codex into volumes with the limit of entries per volume being 100.

So, for those of you who have sent their request for characters do not worry I have not forgotten but the amount of characters you guys have sent my way is so overwhelmingly large that the list I made for it has not even reach the halfway point and new characters are added to the list with each request. So, don't worry those characters will eventually receive an entry. Before I go, I just want to thank you all for following my work and for your constructive criticism and I hope that you continue to follow up on any of the works that I may put up in the future, until then have a great day and until next time.