An Instant Allegiance Artifact is, in short, an artifact that will change the alignment of a character. This could be with voluntary use of the artifact or be used by someone else to change alignment.

A variation is that the artifact does nothing at all, but the subject ''[[PlacebotinumEffect thinks]]'' [[MagicFeather it]] [[MacGuffin does]], and behaves accordingly.

See also TheDarkSideWillMakeYouForget and HypnoTrinket. Compare MirrorMoralityMachine.
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!!Examples:

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[[folder: Anime and Manga ]]

* [[YakitateJapan Yuuichi Kirisaki's Go-Pan #1]] caused an instant alignment change after consumption.
* In the first season of ''Anime/{{Digimon|Adventure}}'', there were the Black Gears, followed by the Black Rings, Black Spirals, and Dark Spores in ''Anime/DigimonAdventure02''. The first three turned Digimon evil until they could be removed or destroyed, while the Dark Spores [[spoiler:turned ''humans'' evil]].
* In ''Manga/FairyTail'', the ancient magic Nirvana did this, with a slight twist in that it turned villains good as well as turning good people evil. (as long as their emotions were in flux: basically, a good person would turn bad if they were depressed, angered, or otherwise in a negative state, while a bad person would turn good if they were happy, pleased, or otherwise in a positive state.)

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[[folder: Comic Books ]]

* SpiderMan's [[ClingyCostume black symbiote costume]] typically brings out the darker, selfish desires of whoever wears it.
* Many forms of [[GreenRocks kryptonite]] have this effect on {{Superman}}.
* The Thinker helmet in ''SuicideSquad''. Grants the wearer technopathy and massive intellect boosts. However, the darker facets of their personalities are left to take the helm.

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[[folder: Film ]]

* Letting Film/TheGoldenChild touch you will result in you becoming his protector, even if you were ordered to kill him.
* Loki's sceptre in ''Film/TheAvengers'' allows him to turn those opponents that he doesn't just vaporise with it. [[spoiler:Except Tony Stark because of the reactor in his chest. It just doesn't work.]]

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[[folder: Literature ]]

* Possible UrExample would be [[Literature/TheLordOfTheRings the One Ring]]. It will make whoever holds it into something it can use to return to its one true master.
* In ''The Witch's Eye'', from the ''Witch'' series of books, the titular glass-eye seems to make anyone who carries it slowly turn evil. And, much like The One Ring, it also makes it very difficult for the carrier to throw it away.
* In Fred Saberhagen's ''{{Book of Swords}}'' book series about a set of magic swords forged by the gods, one of the swords - the Mindsword - had this as its ability. Whenever it was drawn, anyone who saw the blade would instantly become a follower of the wielder. Let me repeat that: ANYONE who saw the blade, even [[spoiler:the gods themselves]], would instantly become a follower of the blade's wielder, regardless of who the wielder was, or what the personal beliefs of the victim were. And this could be done just as effectively to entire armies as it was to small groups.
* In the SwordOfTruth series, the Confessors were basically walking, talking versions of this. They have the power, through touch, to instantly turn anyone into a servant of the confessor. However, there's a restraint to this power: it has to recharge, and it only can do this to whoever the confessor is touching, so when the BigBad starts hunting confessors, he sends out Quads, groups of four well trained killers, so that the confessor can change one of them, the other three can kill the changed one, then the survivors kill the confessor afterward. It's a highly effective method, as long as they can catch the confessor alone.
** Before the BigBad made the scene, confessors were used to obtain confessions from suspected criminals, since after a single touch, the victim would tell the truth, the whole truth, and nothing but the truth on command. However, since a confessor's touch is essentially permanent, they would only use it on people who's guilt was almost completely certain, in order to confirm their guilt before execution. Unfortunately, the person who SEEMS to be the guilty party isn't always so, so not every person whom the confessors touched was guilty.
*** This was often offered as an alternative to execution after a conviction; if the convicted turned out to be innocent at least they were still alive if no longer the same person; and if the convicted were guilty they could at least be put to good use as a servant of the community rather than being turned into useless meat.
* A rather odd example is the Horn of Valere, which summons the spirits of heroes bound to the [[Literature/TheWheelOfTime Wheel of Time]] -- who will then fight for whoever blew the Horn, regardless of their allegiance and moral alignment.
* The Caps in ''Literature/{{The Tripods}}''.
* In ''Literature/{{Helm}}'', this is one of the uses of the imprinters.

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[[folder: Live Action TV ]]

* From the ''Stargate SG-1'' movie ''Film/TheArkOfTruth'' the aforementioned ark is speculated as being one of these, with the ability to instantly change someone to the side of truth. [[spoiler: Turns out it's basically programmed to show followers of the Ori that they're wrong, but it's speculated that it could be reprogrammed to make someone believe anything. Apparently the Ancient who created the device had a sense of irony, because the password to activate the Ark is "Origin".]]
* ''LegendOfTheSeeker'' has the Boxes of Orden, which, when put together, give the wielder the power to instantly gain the allegiance of anyone in line-of-sight. In order to counteract the seductive effect of Orden on the wielder, the activation must be coupled with [[PowerOfLove Confession]]. Breaking up the boxes instantly returns all who were under their power to their original allegiance.
** An attempt by Zedd to alter Cara's past results in a radical change to the timeline with Richard succeeding in using the Boxes of Orden to turn [[MagnificentBastard Rahl]] into a loyal ally and become the ruler of [[TheEmpire D'Hara]].

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[[folder: Tabletop Games ]]

* In ''DungeonsAndDragons'' some [[AncientArtifact artifacts]] have [[BlessedWithSuck curses]] that gradually change CharacterAlignment.
** Almost this, the Helm of Opposite Alignment from will flip the CharacterAlignment of any who wear it to its diametric opposite. It doesn't switch allegiances immediately, but it can potentially unmake any paladin who wears one or tear an adventuring group apart... though that might be debatable, considering [[SociopathicHero the ethical standards]] of some D&D players.
*** In earlier editions the change took place immediately.
*** In DarkSun this little trinket led to the founding of the Veiled Alliance -- a [[TheDragon high-ranked templar]] got subverted and used his penchant of weaving conspiracies for a good cause (''Water and ashes'' short story by Allen Varney).
** ''ForgottenRealms'' has the Crown of Horns, enchanted by Myrkul, former god of death, to turn the wearer's alignment to {{Neutral Evil}}. The first Crown came to control a high-ranked divine minion and was promptly crushed by another servant of the goddess it crossed. If it wasn't bad enough, the Crown v.2 contains what's left of Myrkul, and the wearer is stuck with it not until some priest manages to get close enough to cast "remove curse", but until the dead god chooses another puppet. While gradually transforming into an undead. That will turn to dust once Myrkul decides to leave.
** The god Cyric created a magical book that would convince everyone of his omnipotence and perfection. When he read the book himself, he became completely delusional.
** When the Eye of Vecna is placed in a living creature's empty eye socket, the creature will immediately change alignment to NeutralEvil. If the Hand of Vecna is grafted onto a creature's arm stump and one of the Hand's primary powers is used, the creature will become NeutralEvil at once. (In earlier versions, this has the added bonus of making the Eye and Hand's wielder think they are actually Vecna.)
** Those unfortunate enough to look into the Mirror of Simple Order (from Tome of Magic) long enough are polymorphed into their reflection, which is grayed out and stripped of ornaments. For really unfortunate ones this also includes turning LawfulNeutral with very boring personality, average stats, and [[LawfulStupid out to set order to the world]].
* ''{{Warhammer 40000}}'' Choas weapons are possessed by daemons and will corrupt its wielder to Chaos. One of the best examples is Fulgrim Primarch of the Emperors Children legion who obtained a sword which was corrupted by a daemon of Slaanesh, he is slowly corrupted by its influence an became a Daemon Prince of Slaanesh.

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[[folder: Video Games, Role Playing Games ]]

* The ''VideoGame/{{Warcraft}}'' series contains the artifact Frostmourne, which sucks out the soul of anyone who uses it and lets them hear the voice of the Lich King, thus equipping them with a lack of conscience and a new master in one stroke.
* ''{{Nethack}}'' got a helmet that temporarily causes your alignment to flip.
** Bizarrely, it doesn't make you ''do'' anything per se. It just causes opposite [[KarmaMeter damage.]] So with some exceptions, you can put the helmet on, do some stuff that normally causes Karma damage, uncurse it off, and it translates as if you've been doing the proper actions.
*** Be careful about sacrifices, though - do the wrong ones, cement your alignment, and you've triggered the one way to make ''Nethack'' {{Unwinnable}}.
* ''ArcanumOfSteamworksAndMagickObscura'' has a dark helm which gives the wearer a boost to their magical aptitude in exchange for penalizing (or rewarding, depending on your character) their alignment with 20 evil points. In an unpatched version of the game, both changes are permanent, and a new bonus is added each time the helm is taken off and re-equipped.
* ''[[BaldursGate Baldur's Gate: Tales of the Sword Coast.]]'' Helm of Opposite Alignment, complete with a stick-to-your-head curse!
* In ''VideoGame/{{Fable|I}}'' clothes or armor have alignment change stat. A full suit accounts for about 1/4 distance between pure good and pure evil. If you feel you're too nice, just wear evil clothes, and you're a 50% less good anti-hero.
* The Psychosis Gun in ''PerfectDark'' makes the target think friends are enemies and vice versa. It figures most prominently in one of the bonus missions that Elvis undertakes.

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[[folder:Web Comics]]
* In ''Webcomic/{{Erfworld}}'', the Arkenpliers, as wielded by their attuned master, are capable of Decrypting units (which works like Uncroaking/Animate Dead, except they resurrect as sentient, non-decaying units instead of zombies). The Decrypted are loyal to the Arkenpliers' user regardless of past loyalties; [[spoiler:even the Decrypted Prince Ansom experienced a complete alignment reversal. It was initially unclear whether that was because of the Arkentool or just a matter of him going nutty over being beaten by Parson, but it has since been revealed that the Arkenpliers have that effect on anyone. His brother, Ossomer, proved that was not irresistible by turning his allegiance back]]. In both cases, the person seemed to retain their original personality (although the initial death experience affects some more than others); Ansom was a fanatic (first as a Royalist then, after being defeated and resurrected, as a Toolist) while Ossomer was dedicated to the principles of nobility and remained so even after being Decrypted.
* In ''Webcomic/EerieCuties'', Chloe's mom has the "Doom Panties" locked away. These enhance a succubus' power as well as their HornyDevil instincts. When Chloe puts them on at too young of an age, she instantly transitions to a full-blown succubus and goes from a nice, nerdy, shy girl to contender for AlphaBitch.
* The Other's slaver wasps in ''Webcomic/GirlGenius''. Get snagged by one, and that person's enslaved to the will of the Other.
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[[folder: Western Animation ]]

* In ''KimPossible'', there was a helmet that flipped people between being a superhero and supervillain.
** Later turned into a laser weapon, causing multiple midfight switches. And of course, it hits [[SuperpoweredEvilSide Ron]].
* The Ying Yo-Yo and Yang Yo-Yo in ''WesternAnimation/XiaolinShowdown''. If you use one to go into the Ying-Yang world, you come out evil. (A later episode says it just reverses alignment.) Using both nullifies this drawback.
* Megatron infamously reprogrammed Rhinox in the ''WesternAnimation/BeastWars'' episode ''Dark Designs''. The latter's strength and intelligence, coupled with Predacon ambition and lack of scruples, allowed him to singlehandedly trash half the base and take over the rest before he picked up the VillainBall and Megatron changed him back.
** Also done to Ravage via a recording of [[spoiler: the G1 Megatron]]
** And this is what G1 ''Autobots'' did to Devastator.
*** Which is only fair as a later episode revealed Megatron made the Constructicons evil.
* The [[WesternAnimation/ChallengeOfTheGoBots GoBots]] had a Good/Evil switch of sorts. Why do they even ''have'' that button?
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