common Nasuverse fanon

Claim: Moonlit World is what the supernatural world is called.
Response: The term "moonlit world", while positively chuuni enough Nasu could have come up with it, is pure fanon. It was actually the original name of the website component (now lost) of the Beast’s Lair forums back in 2005, and somehow spread to fanfics as a useful shorthand term. An actual term used in canon for the supernatural side of things is 魔術世界, translated as "magic world", "world of magic", or "world of magecraft".
Claim: Zelretch is a troll.
Response: A common feature in fanfics to have Zelretch serves as a sort of ROB transposing people to other worlds, it doesn't have a lot of grounding. The creation of the Kaleidostick is also brought up, but from the scene in FHA, it seems like Zelretch made the stick not because he wanted to troll people but he needed it for something, and the spirit of Ruby was just a side effect. Considering he later threw it in a box with safeties isntalled and the stick hates him, using it as proof of trolling is weak.
Claim: Shirou is amnesiac, having lost his memories in the Fuyuki fire ten years ago. It is also his first memory.
Response: Shirou isn't amnesiac. In fact, Shirou remembers both his parents and where his house was. He just represses the memories because of his PTSD (more below).
Claim: Shirou possesses the Reality Marble Unlimited Blade Works because he has a distorted/inhuman mind.
Response: Rin says "distorted", but there is a very specific context to that, it's not a factual assessment of Shirou's mental state nor does it say that's where his RM stems from. In fact, she says his way of life is distorted, not him himself, though that might seem like a cosmetic difference to some. Shirou's Reality Marble is explicitly the result of both his Origin and Alignment being "Sword", as stated in fate/complete materials 3's Theory of Magic (p. 41), not his mental state. Rin calls Shirou distorted all of once, so people take this unqualified psychological assessment at face value. They also take a statement about demons having RMs because of their alien mindset as applicable to everyone else. It's a bit hard to pin down why Shirou is the way it is, but the most likely answer is PTSD, especially survivor's guilt, as explicitly stated by Archer in Fate/Extra. Due to being the only survivor of the fire, Shirou feels extreme guilt at having been the only one to survive, and him latching onto his father ideal of heroism is a coping mechanism for it. Going by the Fate/Zero BD Drama CD 2, Shirou's survivor's guilt/PTSD was so severe that Kiritsugu needed to drug Shirou often every time he had nightmares just so the kid could sleep peacefully. This affliction also ties into the aforementioned fact that he represses his memories out of trauma (which you can see him doing when he visits his house's former location or in the HF route immediately after he kills Salter), or that he "doesn't smile" as Mitsuzuri and Nasu himself put it.
Claim: Gaia crushes Shirou's projections so they are temporary before fading not long after.
Response: Shirou's Projections can stay seemingly indefinitely, as he accumulated them in his shed, and he dismisses them to make them disappear. This is most likely because what Shirou does is explicitly different from normal Projection and isn't actually it, it's just a byproduct from his actual spell, Unlimited Blade Works. Projections normally do evaporate, but it more of a natural reaction than the World (be it Gaia or Alaya) trying to crush Projections. What it does try to crush are Reality Marbles, so do not confuse the two.
Claim: Shirou can't copy Ea because it's made of alien material or not of Earth.
Response: It's actually because Ea can only be wielded by Gilgamesh and only him, as stated in Fate/Zero Anime Visual Guide II: "Though it is wielded by Gilgamesh, who has the prototypes of every Noble Phantasm, the Sword of Rupture Ea is different from the other Noble Phantasms that can be possessed by other heroes. It alone is a completely unique existence that can only be possessed by Gilgamesh. Therefore, even with Unlimited Blade Works, it is impossible to reproduce it."
Claim: Shirou is a Sword Incarnation due to having a Sword Origin and Element.
Response: The term "Sword Incarnation" or even shortened to "Incarnation" to refer to Shirou is a complete invention, a term originating from the fanfiction From Fake Dreams by Third Fang (specifically the sixth chapter). The story claims this is the term for someone having the same Origin and Element, and also seems to believe this is why Shirou acts the way he does, as the previous chapter has Kiritsugu tell Shirou that it makes him think of himself as a tool to be used in violent situations, basically a living sword. Naturally, this is a bunch of bullshit with no basis in the Nasuverse, and seems to be because the author believed Shirou acts like a sword and making up an explanation that fit. As seen above, the causes for Shirou's mentality are probably far more mundane than mystical BS. Otherwise, Azaka would be called "Taboo Incarnation" or Lio "Consumption Incarnation" for acting on their Origins. The use of the term incarnation in the Nasuverse is either its normal meaning or to refer to a Servant gaining a body of flesh and blood, like Iskandar wished for and what Gilgamesh got. So the term "incarnation" is wrong both factually (as the term is incorrect and/or doesn't exist) and thematically ("being a living sword" is not what is wrong with Shirou). Just don't use it, no matter how many times people claim we "need" a term for dual Origin and Element (because we don't).
Claim: Shirou was the 6th or 8th (depending on the version) known case in human history of a human Reality Marble.
Response: As far as can be ascertained, the claim originates from fanfiction writer Gabriel Blessing, specifically his fics Hill of Swords (chapter 22) and In Flight (chapter 17). (This IF chapter also includes theprevious claim debunked above of Shirou's "distortion"). Where GB got this belief from, God and him only know, but it's not Nasuverse canon. The various entries on RM say that Dead Apostles Ancestors have it and advanced magi can create them. It implies difficulty, but not so much that only a few humans in history have managed it. And now that we have many Servants with RMs, this is even more silly.
Claim: Gilgamesh wants to unleash Angra Mainyu because he was corrupted by the mud when he was incarnated.
Response: A frequent mistake that is understandable, at least more understandable than some other claims here. In actuality, Gil was incarnated because the Mud couldn't corrupt him, so it spit him out. The entire scene in Fate/Zero shows that Gil laughs it off and states that a king is already expected to bear the entire world and this much is nothing. It's not a retcon either: Saber thinks in the original FSN VN that the mud bath drove him insane before she backtracks and remembers that he was always like this. Later the HF route makes it even more explicit when Sakura talks to Kirei and says "That gold person was showered with the contents of the Holy Grail, which connected him to it. But it couldn't taint that man, so it flowed into you, his Master. Right?"
Then why does Gilgamesh in FSN wants to cull humanity? Because of the incarnation itself. Gilgamesh is an "observer" of humanity that would otherwise not pass judgement on it, but when he acquires a body of flesh and blood, modern era and consumerism disgust him, so he now acts as a "judge". He himself explicitly says this in both Fate/Extra CCC and Fate/strange fake.
Claim: Caster Gilgamesh is Gilgamesh after his quest for immortality, while Archer Gilgamesh is his younger self when he was a tyrant.
Response: "Archer is Gil pre-immortality search" kind of fails when Archer Gil remembers his Epic. In the Fate route for example, he says "The Holy Grail? Oh, immortality. Heh, I gave that to the snake". The Babylonia Singularity itself has him talk about sealing Key of King’s Law so he would be more suited to protecting Mesopotamia; his regular King of Heroes iteration has no need for vassals.
Claim: Ciel was born a French peasant in Medieval Europe.
Response: Ciel is explicitly stated in Tsukihime to be born in 1976. Where does the fanon comes from and why do people say it so confidently then is anyone's guess.
Claim: 1900 is the cutoff date for people to become Heroic Spirits.
Response: This is based on what Rin says in Day 3 of the game's Prologue (And with the passing of years ignored, the heroic spirits are summoned. The most recent from a hundred years ago, the oldest from the ancient days.) and mixed with other miscellaneous Nasu statements like how it is extremely difficult for modern weapon users to become HS. But the original statement is actually somewhat mistranslated, and in a literal translation Rin does not give a categorical affirmation, but just an estimation of the range: "And irrelevant of era - from as close as a hundred years prior; or as far as the vicinity of the Age of Divinities - Heroic Spirits have been summoned forth." Ergo, it is not a factual statement on the Throne's database, especially as the game itself would contradict this claim by the very summoning of Archer. FGO has since come with Servants close to the 20th century or from it (although the first one would be Lu Shuwen in Fate/Extra), which causes some people to call this a retcon by Nasu, even though it kinda isn't.
The real Doylist reason for Nasu's reluctance to have modern HS is as follow, in his own words: It's why I've always been opposed to turning contemporary figures into Servants, because they're extensively documented. That said, Fate GO has such a huge volume of Heroic Spirits that I violate that taboo.
Claim: Gaia hates humans, hence why she called the TYPES to kill them.
Response: It's complicated. The planet seems to dislike some things humanity does, but it also allowed them to become the dominant species ("gain the seat of primacy/primates" in Nasu speak) and the rules of the world to be more clement to humans, which means punting Phantasmal Beasts and magical stuff to the Reverse. Mostly it seems to consider humans its children and to do what they want so they can grow. But if they still stay on her corpse after she dies, then there is a problem.
The claim also gives the planet more personality than it actually has. Even me saying "she" is more out of convenience than anything. Unless you're talking about Archetype Earth, the planet is just a will than a consciousness, more of a system that is semi-sentient than a being. In the same optic, despite its ubiquity in the fandom, "Gaia" is not the earth's name, it's only said to be the name of its Counter Force, just like humanity's Counter Force is called "Alaya" (that name is also very rarely used in the Nasuverse tbh). Instead, the Nasuverse favors "the planet" or "nature" when talking about planet earth (also "the world", but the term is used interchangeably in the Nasuverse to refer to the planet or the Human Order).
Claim: Gaia has a Grand Reality Marble.
Response: It kinda ties with the above, but no the planet doesn't. What makes the world the world is due to the Human Order, aka the Common Sense of mankind aka the collective unconscious of humanity. It's also what's called "the (Human) Universe of Awareness".
Claim: Jeanne d'Arc was an agent of the Counter Force instead of God.
Response: Doubtful. It is frequently proclaimed loudly to be "canon", even though it seems only because people took it from the infamous wikia and never checked the context. "Joan of Arc is also named as one who was empowered by the Counter Force" is a misleading statement as it doesn't say who says it or why. The context is that this is from Kara no Kyoukai's fifth arc, Paradox Spiral. In the scene, mage Touko Aozaki explains to mundane man Mikiya Kotuko what the Counter Force is which is the first time he's heard of it. What happens is that, hearing this explanation, Mikiya (again, a non mage with no authority on the subject) thinks to himself and speculates that Jeanne d'Arc sounds like someone who was powered by the Counter Force. That's it. This isn't Word of God, it isn't even from someone who knows what they are talking about, it's a statement from a random normal person just now learning what the CF is that people takes as gospel and the true account of Nasu Jeanne. That said, the original story of Apocrypha as an online game does make Jeanne an agent of the CF, so that could serve as better proof, but it is an old statement about a game that doesn't exist and it doesn't say she was when living.
Claim: The Age of Gods was ended because of Christ.
Response: This is based on Merlin saying to Artoria in Garden of Avalon that the Age of Gods ended 500 years before their times. But that's all he says, so saying it's due to Christ is just an extrapolation. And since we know the AoG declined over time due to 3 events and ended earlier in other places (the Norse in 1000 BC), it might be that it just reached its definitive end after its slow death over the centuries. That said, the Fate world timeline from the El-Melloi Case Files Materials indicates that the First Magician was born the night before 0 AD, so there is clearly some link, but who knows at this point.
Claim: Shirou's Circuits can each barely handle 10 units of mana, while being damaged in the process.
Response: This is probably a misapprehension propagated by the Wikia. Shirou's individual Circuits are given to have a capacity of "a mana of ten," but whether this can be literally taken to mean "10 units of mana" is unclear.
Claim: Anti-World Noble Phantasms can destroy the Earth.
Response: In Grand Order's Subspecies Singularity Shinjuku, it's given that Noble Phantasms categorized as Anti-World can't actually destroy the Earth, on account of multiple mechanisms implemented to prevent such a thing by the Counter Forces. The reason Ba'al and Moriarty enacted a plan to trap Guda in a culled timeline was that the iteration of Earth within a culled timeline has no such protections.
Claim: After hearing that Ayako was attacked by a molester on the way home, Shirou dismissed it, saying something along the lines of, 'It's good that she was molested, because it's otherwise impossible to teach her femininity.'
Response: While he did in fact say, "If an event on this level didn't occur, it would be impossible make her conscious of her femininity," it wasn't given that the person who attacked her was a molester. Rather, the notion that she was sexually assaulted in some way was entirely an invention of the Mirror Moon translation; and rather than saying "it's good that she was molested," Shirou actually said, "isn't it fine?" in context of the fact Ayako wasn't seriously injured.
Claim: Sorcery Traits are abilities related to magecraft in some way, inheritable via genetic descent.
Response: This is a misapprehension propagated by the Wikia. In fact, what the Wikia translates as "Sorcery Trait" is more correctly rendered as "Thaumaturgical Attribute / Specialization" (魔術特性, majutsu tokusei), and encompasses such basic things as Reinforcement, Conversion, and Absorption. As a Crest accumulates per the research of a thaumaturgical lineage, said lineage typically focuses itself to the exploration of particular Attributes; and thus, the Crest becomes an inheritable vehicle of whatever Attributes the lineage focused upon.
Claim: Shirou's Projection / Tracing is a deteriorated form of the 1st Magic.
Response: The claim that Shirou's abilities are a deteriorated form of the 1st Magic comes from a misapprehension of Mirror Moon's translation of FSN, wherein "thaumaturgy / magecraft" is typically rendered as "magic." In the scene where Rin investigates Shirou's shed and sees that the objects he Projected a period of time ago are still around, she tells Saber that, because Shirou is "giving form to things that should not exist," he's not a magus, and that, "His magecraft is most likely a deterioration from a certain thaumaturgy." Mirror Moon renders this as, "His magic is probably a deteriorated version of that one magic."
Claim: The 1st Magic is the Denial of Nothing - the creation of something from nothing.
Response: "The Denial of Nothing" is one amongst several domains given by Bazett in Hollow Ataraxia as a "Miracle" that would justify "the Resurrection of the Dead" - the other two being "Time Travel" and "the Management of Adjacent Worlds." The latter is the domain of the 2nd Magic, and the former has historically been given as an impossibility that falls to the domain of Magic. By conjecture, then, "the Denial of Nothing" should be the domain of a particular Magic, but which one isn't explicitly stated. In the materials for Kara no Kyoukai, it was given that Ether Clumps - the claylike substance generated by the failure of a thaumaturgy - is "materialized nothing," somehow related to the 1st Magic. This is the source of the presumption that - similar to Rin's explanation of what Shirou's Projection is - the domain of the 1st is "materializing something from nothing"; and the presumption that the terminology used associates the 1st with "the Denial of Nothing." In fact, neither presumption is ever explicitly confirmed, and remain as possibilities.
It should also be noted that Alice Kuonji's Flat Snark in Mahoyo is stated to be "split off from the First" in the 5th chapter, the furigana / rubytext for 第一 (dai ichi) "the First" being はじまり (hajimari) "the beginning" - which is also used in reference to the First Magic in Chapter 12. Ergo, the implication is actually that the Flat Snark is related in some way to the First Magic.
Claim: Gilgamesh could have killed Tiamat on his own, but it would result in the complete annihilation of Uruk.
Response: Gilgamesh stated something to the effect of, "To the matter of the present calamity, it cannot be said that things would be fine if I alone are strong. So as to protect my citizens; my territory; the stability of our lives - the instrumentation of all of Mesopotamia to the purpose of war was necessary. To this end, the Key of the King's Law (Treasury) was sealed, and the staff of the magus was taken up instead."
Claim: Oni are Incarnated Demons.
Response: One of the two definitions of Oni give that they're a variety of "Ma" (魔, "aberration") - which are in turn defined as "that which, while being of Nature, bear the capacity to distort the flow of Nature by the exercise of unnecessary powers." Being that they often manifest as fleshbound beings, and "Ma" was previously mistranslated by the Wikia as "Demon" (and the Wikia is presently still wrong), Oni have been conflated with "Incarnated Demons" of the variety of Goetia, and "True Demons." In fact, Oni and "Incarnated Demons" are not the same thing, and "True Demons" haven't yet appeared within the setting on-screen.
Claim: True Assassin relies on drugs (hashish) for pain suppression.
Response: That was an invention of Mirror Moon.
Claim: Most of the 27 Dead Apostle Ancestors are capable of using Reality Marbles.
Response: This is a mistranslation that exists in TMDict. Plus Period actually gives, "it would seem that the greater half of them have arrived upon the possibility of creating Reality Marbles."
Claim: The Rin in Fate/EXTRA is the daughter of Sakura Tohsaka. Or any of the myriad explanations for Extra Rin's existence, like her being Rin's daughter, niece, or half-sister.
Response: The most concrete info we have is still vague b

….grammar needs working on lol as you seem to be missing words/letters that would make your sentences flow better but you also have added unneeded letters to words as well

Love the story. I hope that you updated soon

more please

I think Gabriel would have been a better option than Uriel. I'm surprised that Lore Realm (mainly the Devils) ignored a very powerful magical artifact like Holy Grail, maybe Lore Realm doubts that such a powerful artifact exists

interesting origin that Tiamat (dxd) has in your story, if she is a creation of Tiamat (nasuverse) then Tiamat (dxd) has some Tiamat abilities (Nasuverse) like using some version of the Authority of Tiamat (Nasuverse)

Honestly, the levels of power in DxDverse are totally hyperbole, with few facts to support them and many contradictions. You better not mention it.

It is an exaggeration to say that Great Red and Ophis are the most powerful in the universe when they have only been used as Deus ex Machina and do not have adequate feats about their power levels, Beasts of Calamity (Goetia, Tiamat, Kama / Mara and Heaven's Hole ) even Arjuna (Alter) have more exploits than Ophis and Great Red together

Do not forget that nasuverse has its own supernatural threats like Arcueid Brunestud, The Twenty-seven Dead Apostle Ancestors, Type Mercury (Alien that alters the reality that surrounds it), Beasts of Calamity. I mention them because you have only mentioned DxDverse supernatural beings but where are Arcueid Brunestud, The Twenty-seven Dead Apostle Ancestors, Type Mercury (Alien that alters the reality that surrounds it), Beasts of Calamity, etc. in your story

Honestly if humanity is eliminated, then Naomi's world will be completely eliminated since the "System" eliminates world where humanity became extinct or advanced too quickly or worlds that can no longer move forward or are completely needless.

if the dragon are agents of Gaia it means that Tiamat (dxd) appears to stop the antagonists (DxD) like Kokabiel, Caocao or Rizevim

that was ingenious about how you explained about Fafnir (maybe being killed twice could explain fafnir's personality today and the reason for his fetish). I wouldn't be surprised if Naomi tried to kill Fafnir when she discovers he has a fetish by panties..XD

I honestly didn't understand how Vlad survived

I also don't understand very well what Lore Realm is and if Lore Realm is the replacement of Reverse Side of the World, in fact I think Lore Realm is very redundant.

Also, if the magical world was divided it means that there are two versions of the gods version DxD and version Nasuverse

Be careful with the gods because there is a great difference between the GODS (Nasuverse) and gods (dxd) .and the LostBelt 4 and what Arjuna Alter (destroy and recreate the universe instantly that is much faster than what Mordred affirms that it takes the gods to destroy cities) was able to do, not to mention what the LostBelt 5 could possibly reveal (new information about the Nasuverse gods or something else that could hinder the writing of this story)

I WISH YOU THE BEST OF LUCK FOR YOUR HISTORY, Nika Raven Celeste.

So Artoria (Nasuverse) has a connection with Ddraig, that connection also has Pendragon (DxD).

You know Waver also known Lord El-Melloi II has an apprentice, she is called Gray and is a descendant of Artoria. Gray can also use Rhongomyniad, that spear is important for the balance of the world.

please don't use expressions like Akasha knows where to curse the root or blame zelretch for any misfortune that's fanon and it's not funny at all

Good

more please

Very interesting.

very nice yeah great

Well, that was an interesting way to handle Achilles vs Atalanta fight? But I think I found how the canon version was more heartbreaking and heartwarming. But then again Achilles at the time lost his invulnerability to Chiron. Here he is an ally to the Black.