->'''Black Mage:''' "How do you keep ''doing'' that?"\\
'''Sarda:''' "It's a simple ''Re-Write Reality According To Your Whim'' spell.
-->-- ''[[WebComic/EightBitTheater 8-Bit Theater]]'', [[http://www.nuklearpower.com/2009/05/23/episode-1131-turnabout-isnt-fair-play/ "Episode 1131: Turnabout Isn't Fair Play"]]

If a {{Retcon}} is changing the past, and a CosmicRetcon is an in-universe changing of the past, then [=Retconjuration=] [[strike: never happened]] is the ability to ''create'' a Cosmic Retcon. Possibly a subtrope of RealityWarper, and [[strike: [[NoodleIncident was once mayor of New York]]]] may or may not involve [[LeaningOnTheFourthWall leaning on]] or [[BreakingTheFourthWall breaking]] the Fourth Wall, or pressing a literal ResetButton. (Although, depending on the scale of the [=Retconjuration=] instance, it may categorically force other in-universe examples of RealityWarper into becoming an in-universe subtrope of [=Retconjuration=] itself.)

There are two flavors of this trope, items that allow individuals to change the past (a TimeMachine being the TropeCodifier) and individuals who can change the past under their own power. Said individuals may [[AGodAmI believe themselves to be]] deities, and depending on the scope of the power, they [[PhysicalGod might]] [[EldritchAbomination not]] [[PowersThatBe be]] [[CrystalDragonJesus wrong]].

Compare PeggySue. Contrast RetGone.
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!!Examples:

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[[folder: Anime & Manga ]]

* [[spoiler:Madoka uses her wish to do this]] in the final episode of ''Anime/PuellaMagiMadokaMagica'', [[spoiler:completely rewriting the MagicalGirl system so that no magical girl will become a witch, on this or any world, in this or any time past, present or future -- which has the effect of completely destroying and remaking the universe anew]]. This doesn't come without a cost, however: [[spoiler:Madoka essentially erases herself from existence after annihilating Walpurgis Night, since the power she expended during the battle would have otherwise made her a witch]].
* Doing this is [[spoiler: Tsukishima]]'s entire schtick in ''Manga/{{Bleach}}''. With each cut of his blade, he [[spoiler: inserts himself into the target's past up to the point where they think he's always been in their lives - and this works on inanimate objects too, to the effect that cutting a battlefield allows him to have set up explosives there.]] ''[[NightmareFuel Creepy.]]'' What makes this even worse is that [[spoiler:he can apply similar changes to ''himself'', allowing him to retroactively memorize opponents' battle strategies, for example.]]
* ''Manga/BlackButler'': [[spoiler: [[OurAngelsAreDifferent Angels]]]] have a variant of this. While they can't change the past on a world-wide scale, they ''can'' alter a single person's timeline to erase negative emotions associated with certain events. Since this action is against nature, however, [[MindRape the results]] [[EmptyShell are]] [[StepfordSmiler NOT]] [[BrainwashingForTheGreaterGood pretty]].
* In ''Literature/{{Another}}'', a class is plagued by a curse kills members of the class and immediate family. This is caused by the presence of [[spoiler:an extra, DeadAllAlong, student]]. [=Retconjuration=] comes into play because it's impossible to identify [[spoiler:the "Extra"]] due to all the students having FalseMemories of that presence. On top of that, even official paperwork has incorrect information. Identifying [[spoiler:the "Extra"]] can only be done ''after'' the school year ends, because everything reverts back to normal at that point.
* ''Anime/TransformersCybertron'': In Japan, it wasn't connected to ''Anime/TransformersArmada'' and ''Anime/TransformersEnergon.'' In America it was, and any inconsistencies were explained in a comic book as being the black hole that was the main problem in TFC spreading its effects across reality, causing events to not always match up. This makes it the possible reason for ''every'' plot hole in ''any Franchise/{{Transformers}}'' work.

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[[folder: Comic Books ]]

* [[TheDCU Superboy Prime]] does this ''[[DidYouJustPunchOutCthulhu by punching]]''.
* ''Franchise/SpiderMan'', Mephisto, "[[ComicBook/OneMoreDay One]] [[DealWithTheDevil More]] Day"
* In ''ComicBook/TheSandman'' dreamers have the power to do this if enough dream the same thing at once; in the short story ''A Dream of a Thousand Cats'', Morpheus reveals that at one point the world was [[CatsAreMean ruled by cats with humans as their prey]], but then a thousand-or-so humans simultaneously dreamed of a world of human dominance, and changed the world so that humans had always been dominant, and the world of cats never existed. A cat prophet is attempting to spread the word of this so that cats can dream the world back into its original state, but is implied to be doomed to fail, since even the cats themselves think it would be impossible to get a thousand cats to agree to do ''anything'' at the same time.
* Dr. Eggman in ComicBook/ArchieComicsSonicTheHedgehog has a device called the Genesis Wave, allowing him to rewrite reality to a limited degree when powered by a Chaos Emerald. He not only used it on Mobius twice, he also used on the ComicBook/MegaMan world during its crossover.

[[/folder]]

[[folder: Film ]]

* Nero does this by accidentally creating an alternate timeline in the latest ''Film/StarTrek'' film, attacking the Kelvin and setting Starfleet down on a rather more militaristic bent. [[spoiler:Also Vulcan is gone.]]
* In the Nicholas Cage film ''Film/{{Next}}'', the lead character has a limited version of this ability, which he uses to stop terrorists and score dates with younger women.

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[[folder: Literature ]]

* ''Literature/TheWheelOfTime's'' Balefire is a handy, portable way to do this, essentially burning the affected individual's "thread" out of existence. [[TimePolice Not everybody's happy about this happening.]]
** Also, there's a Ter'angreal that does it. ''Uncontrollably''. Only the most depraved villains are willing to even go near the thing.
* Creator/UrsulaKLeGuin's ''Literature/TheLatheOfHeaven'': George Orr's "effective dreams" change not only the present but the past as well: people don't realize that the world has changed (and was different in the past).
* ''Literature/{{Discworld}}'' [[BigfootSasquatchAndYeti yeti]] can leave a "[[SavePoint bookmark]]" at some moment in time and later snap back to it if they are killed or in other troubles -- [[SaveScumming now]] ''[[SaveScumming knowing]]'' [[SaveScumming what's going to happen and able to avoid it]]. They died out. Several times.
** Or, for those who aren't aware of the entirety of time, they most definitely did not go extinct. Ever, and if you thought they did then you're remembering wrong. Again.
* In the Creator/JonathanLethem novel ''Amnesia Moon'' this power is possessed by a number of people, which to some extent includes main character Chaos/Everett Moon. The effect is that as you move across the country, you can be thrown from one reality into another that's completely different.
* In the ''Literature/YoungWizards'' series there's a spell which overwrites the past of a wizard's universe with a copy of the past from an AlternateUniverse. Combined with the portion of the spell which searches for just the right AlternateUniverse to copy from, it's a powerful tool for maintaining TheMasquerade.

[[/folder]]

[[folder: Tabletop Games ]]

* The ''Chronomancer'' 2E TabletopGame/DungeonsAndDragons supplement included three progressively stronger versions of this, in the Minor Paradox, Paradox, and Major Paradox chronomancy spells.
* ''TabletopGame/ForgottenRealms'' has a spell that is a very limited version of this -- Spellstrike. It completely negates all effects of one recent (in the same or previous round) casting of a spell or use of a spell-like ability, as if it just failed.
** ''Tome of Magic'' from 3.5e includes the Truenamer class, who at high levels can ([[GameBreakingBug theoretically]]) unspeak the True Name of someone, literally [[RetGone removing them from the fabric of time]].
* The Sidereal TabletopGame/{{Exalted}} boast a technique called Avoidance Kata which, when used early in a battle that turns out to have been a bad idea, allows them to have never got involved. Wounds already inflicted stay, but get a new cause- if you used it after the First and Forgotten Lion [[TimeTravelTenseTrouble never has]] ripped off your arm, for example, you now will have got it caught in a grinding mill or something.
** They also have a martial arts style that essentially consists of punching your opponent's destiny. Fail to dodge, and you may suddenly be a married carpenter in Nexus.
* Similar to the above, ''[[TabletopGame/MageTheAwakening Mage the Awakening]]'' has a Time spell called Shifting Sands, which sends the caster back in time by three seconds, allowing them to essentially redo the previous turn. Injuries do carry over, though. There is also a higher-level spell that allows one to place a temporal marker and SnapBack to it that has ''no'' time limit, but [[FanonDiscontinuity people tend to ignore or houserule it away]].
** And that's not even the ''start'' of the time-related fuckery in the line. A Master-level Time spell allows you to temporarily rewrite your personal history so that, say, you studied martial arts instead of computer programming, allowing you to trade dots in Computer for dots in Brawl. The Cult of the Red Word, a CannibalCult that worships a demon made of living anti-history, has the ability to eat people out of existence if they're slaughtered in their sacred temple. And then there's the stuff Archmastery can do... ''by mistake''.
* The ''[[TabletopGame/MistbornTheOriginalTrilogy Mistborn Adventure Game]]'' allows you to expend Spirit to edit previously introduced facts. It's very likely to fail, though, and really big Retcons are flat-out impossible.

[[/folder]]

[[folder: Video Games ]]

* In ''Franchise/RatchetAndClank [[VideoGame/RatchetAndClankFutureACrackInTime Future: A Crack in Time]]'', Dr. Nefarious plans to use the Great Clock to create a universe where evil always wins.
* [[{{Troperrific}} Obligatory]] ''VideoGame/{{Touhou}}'' example: a weaker version of this is the domain of Keine Kamishirasawa; she's able to "eat" the history of things, which changes the way people perceive the thing whose history was eaten. For instance, during the 8th game, she devoured the history of the human village so that they wouldn't be affected by the dangers of TheNightThatNeverEnds (she restored it later); this way, the village was invisible to pratically everyone, because people would be seeing a reality where humans never settled there in the first place (particularly powerful beings don't seem to be affected by it, though; [[RealityWarper Yukari]], for instance, wasn't affected at all by Keine's ability and could see the village and its inhabitants with no problems).

[[/folder]]

[[folder: Web Comics ]]

* The {{Trope Namer|s}} is ''Webcomic/ErfWorld'', in which [=Retconjuration=] was actually Retconjured into existence.
* ''WebComic/EightBitTheater's'' Sarda uses [=Retconjuration=] with abandon [[spoiler:and White Mage mucks up his attempt to retconjure the world to how he wants it]], but he's more of a straight RealityWarper. Black Mage tries the same spell and it backfires (Sarda wrote the spell to rewrite reality to ''Sarda's'' will, not the caster's).
** Thief [[strike: gets a minor one when he changes the archives so his red outfit was always black]] has never, ever tampered with the fabric of the universe.
* Clockstopper in ''Webcomic/SuperStupor'' (a side-comic of ''Webcomic/SomethingPositive''); he calls it Nut-Punching Father Time.
** It's also his [[WhenAllYouHaveIsAHammer favorite solution to everything]].
* ''Webcomic/{{Homestuck}}'': [[spoiler:John]] gains the power to move through and alter canon during Act 6. This is called out as being different from time travel, which happens a ''lot'', in that it is not bound by the requirement to create {{Stable Time Loop}}s and can move through other universes and even into fictional contexts like ''Film/ConAir''.

[[/folder]]

[[folder: Web Original ]]

* Germaine uses a "reset button" invented by Foamy in the web series: ''NeuroticallyYours'' to initiate a series reboot.
* In ''SCPFoundation'' one of their charges is a book that chronicles the history of an extremely unpleasant civilization (human sacrifice, cannibalism, functional dark magic, etc.) that was wiped out at some point in the past. Whenever something that could be used to write with comes near the book (blood works best), more is written about the civilization and what was previously written changes, so that a battle that previously ended as a defeat becomes a victory - and suddenly archaeologists start finding evidence of them in the places and times it writes about. The book at one point said that the Daevite civilization had been destroyed around 200 BCE, and now it records the destruction of their empire by Genghis Khan, about 1400 years later. Naturally the Foundation doesn't add to it themselves, but they don't think they've destroyed all of the copies, so they keep checking theirs lest they wake up one day to find the Daevites have suddenly been around the whole time.
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