History Franchise / NasuVerse

** In every World — a planet with a will and life on it — exists a certain number of fluctuative parallel worlds formed out of possibilities, each of which is an AlternateTimeline. These parallel worlds require enormomous amount of energy to maintain by said planet's consciousness, as such from time to time they are “pruned” — an event known as Quantum Timelock, in which multiple branching timelines converge together and marking events during said Lock as immutable by normal means. This set of parallel worlds is called “Great Tree Known as Time”, and in the case of Earth, it was originally maintained by Gaia, will of the planet, before humanity became independent and “cancerous” existences toward the planet and developed Alayashiki, the collective will of humanity, which led to Earth's Tree of Time to be forcefully managed under 2 administrators, so to speak.
** This has a strange effect on causality. Gaia and Alaya technically exist beyond any timeline they manage, but they require the planet and humanity's continued existence in order to exist and intervene in a timeline. If the planet is killed or humanity is wiped out in a single timeline, Gaia or Alaya will delete said timeline from existence to prevent its events from becoming immutable facts across all timelines. But if the planet's death or humanity's extinction were to happen on a timeline which they ''cannot'' delete for any reason (such as the presence of extremely powerful beings on the level of [[Literature/AngelNotes Ultimate Ones]] or [[VideoGame/FateGrandOrder Beasts of Calamity]]), then Gaia or Alaya would ''die'' when the events of said timeline become immutable facts. Nasu's earlier work ''Notes'' is a possible future (not an alternate timeline) in which Gaia died and humanity remains on the now dead planet.
** Additionally, it is heavily implied whenever the World interacts with a foreign element from outside the planet and humanity, said element will be present across all possible timelines as a direct result. This is supposedly why vampirism (which originates from the foreign entity Crimson Moon) exists in both Fate and Tsukihime branch of worldlines (albeit at different scales), and why alien invasions like that of [[VideoGame/FateExtella Sefar]] is noted to happen in every timeline.

*** ''Webcomic/RitsukaFujimaruDoesntGetIt''

* TheConstant: The series actually [[JustifiedTrope justifies]] this with the Quantum Time-Lock system put in place by [[DeusEstMachina The World]]. As a limited amount of "water" exists to sustain so many worlds without the universe effectively overloading on the sheer weight of possibilities, Quantum Time-Locks happen every once a hundred years or so to ensure that Constants exist present in all other timelines (e.g. Camelot falling). [[CuttingOffTheBranches Any other timelines that have anything different happen are purged altogether in a process known as 'pruning']]. However, while there exists several Quantum Time-Locks across human history, the ''median'' of which these Time-Locks happen can be extraordinarily variant to a variety of possibilities; it's just that the Quantum Time-Locks are a means of ensuring the most prosperous timelines for humanity survive, and any that have grown past the point of being able to be changed are as a result pruned.

[[caption-width-right:350:L - R: Mash Kyrielight, Shiki Ryougi and Artoria Pendragon]]

* MagicMustDefeatMagic: Beings of Mystery -- immortals, Servants, demonic beasts, or otherwise magical in nature -- that somehow end up in the modern day can only be harmed by (or something empowered by) things similarly magical and/or mysterious. Modern weapons like guns, explosives, or even recently-made swords will either end up easily dodged or simply bounce off, as there is no "Mystery" in how they function. This is a prime point of frustration for any {{Muggle}}s that get caught up in a supernatural incident; a modern human could be the most skilled fighter in the world, and they'd do jack squat to a magical being without having access to magic themselves.

[[TheWikiRule Has its own wiki]] [[http://typemoon.wikia.com/wiki/TYPE-MOON_Wiki here]].

** ''LightNovel/LordElMelloiIICaseFiles''

* ''LightNovel/LordElMelloiIICaseFiles'': A Light Novel series by Makoto Sanda published 2014-19 in ten volumes, starring Waver Velvet, one of the main characters of ''Fate/Zero''. Now older and a professor of Modern Magecraft Theory at the [[WizardingSchool Clock Tower]], Waver and his assistant Gray go around [[OccultDetective solving mysteries]] relating to the world of mages. Set during the months leading up to the Fifth Holy Grail War. Features significant CharacterOverlap with each novel featuring a version of a certain character in the ''Fate/stay night'' timeline. A manga adaptation began in October 2017, and an anime adaptation aired in 2019.

* StatusQuoIsGod: InUniverse. In ''Fate'', whenever a magical being or occurrence is summoned to the modern day, circumstances conspire to remove it. In some cases it may even be {{Invoked|Trope}} by the PowersThatBe, as the world's natural order is not meant to include magic. It doesn't matter where it falls in the spectrum of good or evil, or how deserved, tragic or pointless it's removal is: if it's magical and has no apparent tether to the world, [[TheMagicGoesAway it goes away by the epilogue or pointedly doomed to die post-epilogue]], and this law is enforced with extreme zeal. It's telling that across all the canon ''Fate'' stories and the thousands of Servants that have existed, only ''two''[[labelnote:*]]Abigail Williams and Queen Draco, both from ''VideoGame/FateGrandOrder''[[/labelnote]] have unambiguously survived past story's end with no strings attached.

* UniquenessDecay: It's an actual InUniverse mechanic. The strength of magic in the Nasuverse is determined by its "Mystery", the measure of how common it is in the world. Well-known magecraft is typically weak and menial, whereas lesser-known magecraft is powerful. Magus families are typically built on having a personal magecraft with a lot of Mystery, and enforcing its secrecy keeps that magecraft (and thus their family) strong; the primary reason the world of magic is so volatile is because rival families fight tooth and nail to claim or preserve their secrets.

'''''Tsuki no Sango'''''

* ''[[Manga/FateKaleidLinerPrismaIllya Fate/kaleid liner PRISMA ILLYA]]'': A manga beginning in 2007 that features an AlternateTimeline storyline with Illyasviel (the resident EnfanteTerrible) as the main character... and as a MagicalGirl, complete with a spunky talking staff called Ruby. It is very much an AffectionateParody, both of ''Fate/stay night'' and MagicalGirlTropes in general... [[CerebusSyndrome initially]]. Eventually, it's revealed that the story takes place in a world where Kiritsugu and Irisviel stopped the [[Literature/FateZero Holy Grail War]], and with it, carries all the baggage associated with the ''Nasuverse''. Notably, [[DarkerAndEdgier the overall plot gets much more serious]] and borrows heavily from ''Literature/AngelNotes''.

* ''VideoGame/FateGrandOrder'', the "Fate Online Project Reboot" RPG on iOS and Android based off of the scrapped ''Fate/Apocrypha'' online game written by Higashide, Sakurai, and Nasu. An English version handled by Aniplex was announced April 2017 and came out the same year in June. Detailing the struggles of the Chaldea Humanity Preservation Organization as it attempts to correct temporal anomalies caused by a wayward member [[spoiler:and later as it attempts to protect human history and human life against the Seven Great Evils of Humanity, the Beasts]], it began as a relatively simple project but its stunning success has led to it taking a prominent position in the wider Nasuverse, hosting several key reveals about the wider setting. It received an animated adaptation of its prologue arc on December 31st, 2016. It has received several manga series, with six official adaptations (two of the first arc, four of the interim arc), several manga anthologies, a series about the real world stories and histories behind the Servants, a series about the Servants cooking meals, similar to ''Manga/TodaysMenuForTheEmiyaFamily'', a series with various stories about the Crypters from the second arc, and Riyo's ''Webcomic/LearningWithMangaFGO'' gag series, that one being the most popular. It also has an arcade game, VR spinoff, and tabletop game.

* ''Fate/Samurai Remnant'': Announced on December 31, 2022 as a game developed by Creator/KoeiTecmo's Omega Force. It takes place in historical Japan where the Holy Grail War serves as the Waxing Moon Ritual. This is the first Type-Moon game to be announced for a global release for PC via Steam, [=PS4=], [=PS5=], and Nintendo Switch.

* AdvancedAncientHumans: Humans long ago established many civilizations thanks to gods ruling over them, particularly that of Atlantis, the progenitor of Greek civilization and the domain of the Twelve Olympians/Pillars/Machine Gods. All these civilizations came to an end when the alien Velber came to harvest civilizations and their data, which entailed deploying the White Titan Sefar on Earth to slaughter everything in its path. Humanity has long since forgotten about this time period, with their records only dating back to the dawn of modern civilization in Mesopotamia.
* AkashicRecords: It is also called the Root, and the source of all things in existence. Everything is born from there, and everything will return there after death. The only exception to this are the beings known as the "[[Franchise/CthulhuMythos Outer Gods]]". [[note]]A [[LeaningOnTheFourthWall subtle nod]] to how unlike most characters who are either original or a reimagining of historical/religious figures, the Outer Gods were imported from another work directly with no reworking.[[/note]] Every mage's goal is to reach Akasha and obtain the mysteries within, though this is an extremely difficult task. The very few who manage to reach it and come back can wield True Magic. Shiki Ryougi and Manaka Sajyou on the other hand have been connected to it since birth, and show that it isn't a good thing to be connected to the source of all existence as they have... issues.

* ''Fate/Samurai Remnant'': Announced on December 31, 2022 as a game developed by Creator/KoeiTecmo's Omega Force. It takes place in historical Japan where the Holy Grail War serves as the Waxing Moon Ritual. This is the first Type-Moonn game to be announced for a global release for PC via Steam, [=PS4=], [=PS5=], and Nintendo Switch.

* RetCanon: The wish-granting Holy Grail of the ''Fate'' series was [[spoiler:a heavily-corrupted ArtifactOfDoom housing a SealedEvilInACan that [[LiteralGenie grants wishes in the most destructive way possible]]]] in the original ''stay night''. All AlternateTimeline Grails derived from the Fuyuki Grail system don't have this quirk so their plots can go in different directions.

* RetCanon: The wish-granting Holy Grail of the ''Fate'' series was [[spoiler:a heavily-corrupted ArtifactOfDoom housing a SealedEvilInACan that [[LiteralGenie grants wishes in the most destructive way possible]]]] in the original ''stay night''. Since pursuing the Grail in any subsequent works would both end predictably and be generally stupid following this revelation, this quirk is restricted ''only'' to ''stay night'''s Grail, while Grails in other works function properly.

** ''LightNovel/FateRequiem''

* ''LightNovel/FateRequiem'': A book first released in Comiket 95, written by Meteo Hoshizora and illustrated by NOCO. It takes place [[TwentyMinutesIntoTheFuture in 2025]] after a [[WorldWarIII worldwide Holy Grail War]] that led to rising sea levels, and a new Status Quo in which ''everyone'' has their own Servant connected to a personal Holy Grail in their hearts. It stars Erice Utsumi, the only person with no Servant or Grail, who meets a young boy who is the very last Servant ever summoned.

** There are actually technically ''three'' Ages of Gods, all of which eventually declined and contributed to humanity's rising power; the first ended in 12000 BC when an alien entity known as Sefar landed upon the planet and proceeded to curb stomp the gods which began their overall fading into irrelevance, the second ended in 2600 BC when Gilgamesh rebelled against the Mesopotamian pantheon to free humanity from their control, banishing them to a more passive existence along with King Solomon's death accelerating the decline of mystery, and an unknown event in 700 BC ending the gods for good. However the Age of Man ''really'' starts with 0 CE as that marks when humanity asserted dominion over Earth, and Mystery and magic are replaced with science and technology.

* MagicVersusScience: The primary reason for TheMagicGoesAway stated above: as science elucidates more and more of the natural world and its laws, the less power magic actually has, the implication being that [[YourMindMakesItReal as humanity puts less and less stock into the supernatural, the less it can be used to influence the world.]] Supplemental materials reveal that when the Age of Gods completely ended, the laws of the world literally changed from one based on magic and Mystery to physics based.

** Heroic Spirits are the embodiment of this rule. A true Heroic Spirit is a PerpetualMotionMonster made possible by one of the PowersThatBe to handle threats to the world, and as such in a situation where they're involved, they are constructed precisely so that meddling/ignorant humans on the scene can't interfere with their work.
** Servants, the lesser form of Heroic Spirits, are meant to be summoned and commanded by humans. Despite this they are still essentially living weapons that the human is controlling, and that control is limited. Extremely weak Servants can be beaten by a seasoned fighter, but WordOfGod has stated that Ciel fighting ''very'' defensively is as far as mortal humans can go towards any hope of winning against an average Servant; challenging anything beyond that is futile.

* UltimateLifeForm: The Aristoteles, also called the Types or the Ultimate Ones. They are the most powerful beings from each celestial body, and the embodiment of that body's will. They are among the most powerful beings in the franchise setting, and are so alien that many concepts simply don't apply to them, including ''death.'' Earth is notable for not having its own Ultimate One; the closest it has is Archetype Earth, or Arcueid at her strongest. The only reason the Types do not factor into much of the wider series is due to being asleep, or not being called yet to take action, and only do so very late into the history of events. [[spoiler:[[VideoGame/FateGrandOrder The one time an Ultimate One does wake up early]], it was in a Pruned timeline of Proper Human History where it woke up early due to outside intervention, and it quickly showed why they are worthy of the title of UltimateLifeForm]].

* UltimateLifeForm: The Aristoteles, also called the Types or the Ultimate Ones. They are the most powerful beings from each celestial body, and the embodiment of that body's will. They are among the most powerful beings in the franchise setting, and are so alien that many concepts simply don't apply to them, including ''death.'' Earth is notable for not having its own Ultimate One; the closest it has is Archetype Earth, or Arcueid at her strongest. The only reason the Types do not factor into much of the wider series is due to being asleep, or not being called yet to take action, and only do so very late into the history of events. [[spoiler:[[VideoGame/FateGrandOrder The one time an Ultimate One does wake up early]], it was in a Pruned timeline, and it quickly showed by they are worth of the title of UltimateLifeForm]].

* UltimateLifeForm: The Aristoteles, also called the Types or the Ultimate Ones. They are the most powerful beings from each celestial body, and the embodiment of that body's will. They are among the most powerful beings in the franchise setting, and are so alien that many concepts simply don't apply to them, including ''death.'' Earth is notable for not having its own Ultimate One; the closest it has is Archetype Earth, or Arcueid at her strongest.

* ArtisticLicense: Largely [[AvertedTrope averted]]. Nasuverse as a whole goes to great lengths to make sure all historical characters are accurate to their real life counterpoints, only taking liberties with Mythological characters and/or historical characters with little known information about them. And in said cases, the only given liberties are a [[GenderBender gender change]] that are immediately explained. Moreover, the foundation of the setting (E.g. the Root, Textures, True Magic etc.), are based off of a deep understanding of real-life scientific theories and mathematical principles.

* ArtisticLicense: Largely [[AvertedTrope averted]]. Nasuverse as a whole goes to great lengths to make sure all historical characters are accurate to their real life counterpoints, only taking liberties with Mythological characters and/or historical characters with little known information about them. Moreover, the foundation of the setting (E.g. the Root, Textures, True Magic etc.), are based off of a deep understanding of real-life scientific theories and mathematical principles.

* KudzuPlot: Generally speaking, the works, by themselves, aren't ''that'' difficult to follow, considering how self-contained they are. However, the Nasuverse makes all of these stories interconnected through its strict [[MagicAIsMagicA rules of magic and death]], reoccurring characters and concepts, and even [[CallBack Call Backs]] other works within the setting can make someone who has no exposure to the 'Verse an absolute ''nightmare'', especially considering which work to read first.

* {{Avalon}}: The sacred scabbard of King Arthur. It is also a location found within the Reverse Side of the World and is the home of the fairies after the end of the Age of Gods. It is the location where King Arthur will go to after death and rest until the time of his return. [[VisualNovel/FateStayNight In one timeline]], a Magus named Shirou Emiya managed to end up in Avalon after that timelines version of King Arthur, a female version, gave up her contract to the planet.

* BornInTheWrongCentury: The entire magical society is this, as they insist on researching the past in attempts to recreate its miracles while the rest of the world moves forward with science and technology ever progressing.

* ClapYourHandsIfYouBelieve: Belief and worship are the what gives magic and gods their power in the setting. The more people who believe in a subject, the more powerful it becomes. For example, Servants summoned in their home country where they are celebrated as folk heroes will receive a substantial power boost. Understanding is the antithesis of belief; the more people who understand how a magic system works, the less power it holds. This is why magic is declining as time moves forward, as mankind keeps discovering and deciphering natural laws of the world.