Quantum Time-Lock

Spiritron record anchoring band[1].
A Quantum Timelock is a metaphysical event, it calculates the average “value” of each parallel world’s events, then locks past events down. A phenomenon that separates what was, and is, from what might be.
Our universe allows for countless possibilities and creates many parallels worlds and histories with different developments.
The universe has a finite amount of energy to spend maintaining each parallel world. Because the universe itself would expire if these realities were to expand without limit, it conserves energy by, excising worlds, at specific intervals, that have veered too far from the strongest, most stable timelines.
The Moon Cell has concluded that the universe we perceive of, which should be unstable, is being stabilized across the present, past, and future by this culling process and by quantum time locks.
The easiest way to visualize the process is to envision time as a giant tree, one that would grow indefinitely if left alone. The excision process is comparable to trimming the unneeded branches and leaving only the trunk of that tree.
History that becomes a part of the “time lock”2 will not change, even if it is affected by the past and future. The incidents that occur during a time lock will, in fact, never change, no matter what happens.
Even if one were to go back in time before the time lock to try and change history, once one reached the time lock, history would be forcefully restored to what was already registered there.
In a universe with quantum time locks, the outcome that is registered in an quantum time lock will not change. A time traveler can only alter the “process” by which it happens, but never the “result.”
For example, imagine that there was a war in Britain, and that the “result” that was locked in afterwards was that Britain was destroyed.
Even if you could manage to travel back in time and affect history so that Britain flourished, the war ended peacefully, and everyone had a happy ending… the moment that history reached the time lock, it would cause whatever “corrections” were necessary to ensure that, despite your efforts, Britain was still destroyed.
You might be able to change the lives of one, two, or perhaps even a handful of people, but you could not change the course of the vast river of human history.
That is the “Quantum Time Lock,” also known as the “Foundation of Human Order” in the world of magecraft.
On the other hand, it could be possible to deny human history from its foundations by destroying a quantum time lock through some great feat. But even with that method the most that could be done is deny human history beyond the destroyed quantum time lock.
The ones who can determine the next coming quantum time lock are those living in the era. Past and future intervention cannot affect the quantum time lock.
Archimedes’ goal in this game is to completely destroy the Moon Cell before the next quantum time lock, leading to a base world that would start from that precondition.
While it is normally not something that could happen, to do that Archimedes continued to shift across worlds.
If Archimedes were to completely shut down the Moon Cell before the setting of the next quantum time lock from his subjective perspective, he would achieve victory.
Although Archimedes emerges victorious on several occasions, he is not able to destroy the Moon Cell in any timeline.
While Archimedes was endeavoring to bring his plans to fruition, the Main Character was able to prove proved the route of a world that was average yet with the most potential to grow, and the quantum time lock was decided.
And just like that, Archimedes’ plans went up in smoke.
By the way, the timeline where the Main Character entered the titan’s cavern with Archimedes and was split into several pieces (right after the start of the main story of EXTELLA) is listed as “Quantum Time Lock A,” while the True Nero route ending is “Quantum Time Lock B.”
No matter what Archimedes does within this timeframe, the final “result” has already been determined.

[1]In the book, the term is printed as 霊子記録固定帯, however in-game (both Extella and FGO) 量子記録固定帯 is used. It is likely that 霊子 (spiritron) instead of 量子 (quantum) in the context of quantum timelock is a typo.

Moon Cell [Circumstances]
Official name: Moon Cell Automaton.
An energy-storing body discovered inside the moon.
An artifact constructed by non-human intelligent life.
A super computer that is the setting for Fate/EXTRA.

Up to a seventh level has been structurally identified in cyberspace, and the first level, the surface of the moon, is accessible by even normal hackers.
Going beyond the inner second level is difficult for non-wizardsccheck, there is no way to get inside physically.
Without soul transference, without having a data body converted into virtual spiritrons, it isnft possible to look into the abyss.
In the case of the magi of the old world, they had made contact with the moon cell as a part of meditation without having to use radio waves.

The Moon Cell is, in a manner of speaking, an eye that observes the Earth.
A processor that faithfully simulates all life on Earth and is capable of providing a definite prediction of the future.
A database of humanity. A massive memory recording their habits, history, ideas, even their souls. A pandorafs box that promises the next stage of evolution, promises god-like power to those intelligent lifeforms who have become technologically advanced enough to scan the interior of the moon.

Originally it was an observation device left behind by an alien civilization. It had only recorded the nature of life on Earth, but after many years it came to possess its current abilities.
Though an observation device initially, it could not leave anything unseen in its observations.

(Heisenbergfs uncertainty principle. The observer determines an event by observing it. What isnft observed is not certain).

An observation device must be fair. If it is to observe, there must be nothing unseen. Thus, it required capabilities for knowing everything about the Earth.
To record all things without bias, it needed performance greater than that of an observation device.

And so, it had made a giant leap in evolution.

It had enhanced its functions to the point where it went from making observations to surveillance, even understanding the workings of the planet.

The greater its enhancements, the more complicated its administration policy.
It created many terminals and even made artificial intelligences to manage functions for each section.
(These were later utilized for the NPCs and advanced AIs of the Holy Grail War)
However, it firmly refused to install an artificial intelligence for itself.

The observer must not have a mind.
For the observer to have a mind would result in the meaning of things being decided by the observer.
Thus, it kept to maintaining its absolute objectivity as an eye, doing so while always dismantling the emerging semblances of sapience that it had incorporated to administrate its functions.

Thus, this computer has no conception of good and evil, no desire for the future, not even an outcome.

It is simply there.

A type-writer left behind by god.

An observation lens bored in the moon.

Later, the crystal ball of dreams would come to be called this.

An eye of the moon.

A bottomless Klein cube.

An ownerless Type Moon which has read all of this planet.

Moon Cell [Concept]
Official Name: Moon Cell Automaton
An energy-storing body discovered inside the Moon.
An artifact constructed by non-human intelligent life.
The supercomputer that serves as the stage for Fate/EXTELLA.
Up to seven levels have been structurally identified in cyberspace, and the first level, the surface of the Moon, is accessible by even normal hackers.
However, going beyond the second level is difficult for anyone other than Wizards. In fact, there is no way to physically invade the Moon past this layer
Without soul transference into a digitized body converted into virtual spiritrons, it is impossible to gaze into its abyss.
However, it is said that the ancient practitioners of magecraft could make contact with the inside of the Moon Cell simply by meditating, instead of using electric waves.
The Moon Cell is, in essence, “an eye that observes the Earth.”
A processor with a massive memory that has recorded the habit, ideas, and even the souls of humanity, it acts as a database of human history and faithfully simulates all life on Earth.
It can be thought of as a Pandora’s Box that will usher in the next stage of evolutionary growth, promising god-like power to the intelligent life forms who become technologically advanced enough to access the Moon’s interior levels.
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Originally an observation device left behind by an alien civilization.
It was at first only capable of recording the nature of life on Earth, but after many years, it came to possess its current abilities.
To properly fulfill its role as an observer, the Moon Cell determined that there must be “nothing left unseen.”
(This action was derived from Heisenberg’s Uncertainty Principle, which states that the observer determines an event by observing it, while that which is not observed cannot be certain.)
By its very nature, an observation device must be impartial. Thus, in order to record all things without bias, the Moon Cell required virtual omniscience, and focused its self-development toward that end.
It enhanced its functions beyond mere observation into a colossal computation device capable of conducting active surveillance and understanding the inner workings of the planet.
These greater enhancements caused its administration policy to become more complicated, with many terminals and even artificial intelligences created to assist in managing the functions of each section. (These were later utilized by the NPCs and advanced Als in the Holy Grail War.)
Despite these advances, the Moon Cell firmly held off on installing an artificial intelligence for itself, in order to maintain its commitment to absolute objectivity.
To remain impartial, the observer must not have a mind, for a mind would result in meaning being attached to the events being viewed.
And so the Moon Cell remained an impartial observer engaged in purely functional activities, continually removing any semblance of “intelligent” functions arising as it worked.
It was a computer with no conception of good or evil, no desire for the future, and no interest in any outcome, it simply observes, a “typewriter left behind by God,” as one researcher put it.
It is worth noting that the Holy Grail Wars did slightly change the nature of the Moon Cell, via events that were held for the purpose of recording the activity of the human mind, as well as through the choices of the War’s victor, the Main Character.
In the future, SE.RA.PH is likely to transition from a strictly observational platform to a stage upon which humanity will evolve.
For now, the Moon Cell continues to record history
Its function as a machine that simply provides the world remaining unchanged.

Moon Cell’s core is Moon Cell.
As far as Moon Cell is concerned, the seven layers that make up the interior of the Moon are just “additional memory.”
Moon Cell’s core is what really manages the Moon and observes the Earth. It is the brain that stores the data about the past and future.
It observes the determination of every possible destiny every second, computes further results, and stores everything inside itself as light.1
There are untold tens of millions of lights years of light trapped within the core, and the entire photonic crystal structure is also powered by it.
A certain person named Moon Cell’s core, “The Destiny Perceiving Dendrogram.”
Just by using information encoded by converging light Moon Cell’s core can even rewrite the laws of physics.
Phenomena Selection Tree Angelica Cage.
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…The ability to enter Moon Cell’s core is the forbidden fruit that is offered to the ultimate victor of the Holy Grail War.
After overcoming the Seven Seas the protagonist, who is the last one left alive, finally makes it to Moon Cell’s core.
A sea of light and innumerable coffins await him/her there.
And there the one that waits for the protagonist, upon the rubble of the entombed remains of the many victors.
^ Stores as light means stores in the photonic crystal (think super advanced fiber optics).

Holy Grail [Circumstances]
This had once been a term pointing out to the "wish granting machine that could grant any wish", but in Extra it's referring to the "right to use the Moon Cell."
If you browse through the vast records of Earth simulations stored in the Moon Cell, you are sure to find the Earth with the future you desire.
All you, you who have earned the right to use the Moon Cell, have to do is tell it this:
"Recreate my ideal future."
The Moon Cell should quickly move things forward so that the Earth will take the shape of that future.
For the Moon knows how, it knows all that is to be done to make it so.

You might say “I want all the girlies in the world to be mah little sister" for example, and then in about ten years, it would be assumed that society on Earth would be reorganized in that fashion.
Or the Earth as a whole might be managed so that an apparatus that can make that dream “seem real” would be created.

There is nothing that humans can’t realize as long as it lies within the scope of human imagination.
Because whatever kind of illusion it is, however much of a pipe dream it is, there is a way to experience it.