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->''"The Eliacube is the acme of Eliatrope magic. [[ThirdPersonPerson Grougaloragran]] doesn't know all its secrets, but he knows that its main power is to increase the magical strength of the one using it, up to make him the equal of a god."''
-->-- '''Grougaloragran''', ''WesternAnimation/{{Wakfu}}'', "The Eliacube"

What's [[PowerCrystal crystalline]], covered in ancient [[PowerGlows glowing]] runes, looks great when set in a necklace or staff, worthless to a {{Muggle}}?

Give up? It's this trope!

The Amplifier Artifact is one of the more useful, practical ''and'' powerful accouterments in {{Fantasy}} and SpeculativeFiction. It doesn't [[HowToGiveACharacterSuperPowers grant new super powers]] like a RingOfPower, SuperSerum, or other form of AppliedPhlebotinum, what it does is give the owner or wearer (this distinction [[EmpathicWeapon is not a light one]]) a small or titanic boost to whatever powers they already possess, at times even activating latent ones.

Likely candidates for Amplifier Artifact are ancient swords, [[OrphansPlotTrinket pendants]], [[MineralMacGuffin jewels]], sets of armor, staves, [[BodyToJewel petrified body parts]] and rings among others. It's not unheard of for disembodied organs and appendages to become Amplifier Artifacts if part of the owner's power is sealed inside it. You can also expect these to be weak spots in {{One Winged Angel}}s and thus exceedingly evil ArtifactsOfDoom. It doesn't help that for some reason prophecies ''love'' to [[StoryBoardingTheApocalypse wax apocalyptic]] about how once Dark Lord Zerogeddon gets The Eye of Sorrow, his full powers will be restored and he will be unstoppable.
Not entirely unrelated is the tendency of heroes to eschew these, somehow equating ancient relics of forgotten power with HardWorkHardlyWorks. Still, a respectable amount of heroes will rely on the SwordOfPlotAdvancement to complete their quest. Regardless of being a hero or villain, you can count on them losing the artifact when it comes time for the final showdown.

Compare UpgradeArtifact for weak characters becoming stronger through an item. Also see SuperEmpowering for people who have this effect. See MagicFeather for when someone ''thinks'' an object has this effect, but it doesn't. That can go the other way as well, though- sometimes characters will find they can use their powers without the artifact that supposedly grants them, eschew it as a MagicFeather, and then realize that they can do even better with their new-found self confidence AND the artifact. See also the ForceFieldEffect and PlaceOfPower, where the environment can serve as an amplifier. See also MagicalAccessory for other types of power granting jewelry.

A SubTrope of MagicEnhancement.

[[IThoughtItMeant Not to be confused]] with "artifacts" (distortions) introduced by an audio amplifier, one of which led directly to [[MohsScaleOfRockAndMetalHardness metal]].

----
!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* The "Shikon no Tama" or "Jewel of Four Souls" in ''Manga/InuYasha'' is a [[DepartmentOfRedundancyDepartment jewel]] that increases a demon's strength. It can also be used by evil humans, although the stronger you are naturally the more useful it is to you. Trying to use it for good deeds, whether you are human or yokai, inevitably turns out badly.
* ''Manga/MahouSenseiNegima'':
** The Library Island arc has the Baka Rangers searching for a magic book that supposedly makes the holder smarter, all for the purpose of [[MundaneUtility passing their finals]].
** One of the effects of the Pactios is the partner getting a magical power boost.
** There's also Negi's collection of magical artifacts like his fathers staff or Eva's ring.
** Ako's artifact (an enormous syringe with a very large and sharp needle) can significantly boost all of her target's physical and magical abilities.
* Subverted in ''Anime/PokemonTheFirstMovie''. Giovanni offers Mewtwo some PoweredArmour that would "focus" his psychic powers. What it actually does is suppress them as they are too powerful for Giovanni to handle.
* ''LightNovel/{{Slayers}}'':
** The first story arc revolves around Lina accidentally getting ahold of the Philosopher's Stone, which she describes as "a super magic amplifier." Naturally, the resident BigBad needs it to complete his scheme.
** The four talismans she bought from Xellos. The results of her amplified Dragon Slaves are rather impressive. [[http://homepage3.nifty.com/QPHOUSE/works/text/report/Mazoku2005.html#maou In the novels]], the "Demon Bloods" use the power of Ruby Eye ''and the Dark Lords of three other universes'' -- one per gem. They allowed the previous owner (even though he was another container for a piece of Ruby Eye) to cast spells that normally require more power than any human mage can provide.
** The [[LaserBlade Sword of Light]] is used to amplify and focus a spell. As is, it dices lesser monsters and weaker true Mazoku effortlessly, but more powerful Mazoku can just grab the glow and hurl the wielder like a toy. The same foe, but the sword absorbed [[FantasticNuke Dragon Slave]]? [[SingleStrokeBattle Single]] CleanCut, and no smoking crater. Kills anything up to Dark Lords and works even with the spells ManWasNotMeantToKnow. In novels, it's also known as Gorunnova, and it's one of the five weapons of Dark Star, no less. As the ''source'' of BlackMagic, the Dark Lord has no such problems, but Gaav mocked Lina claiming that mere human like her is harmless, only her sister could power up Gorunnova enough to hurt him.
* In ''Manga/FullmetalAlchemist'', urban legend held that the State Alchemists' pocket watches, engraved with the Fuhrer's Seal, enhanced the power of the bearer's alchemy. They don't actually do anything, though -- they're just watches. In [[Anime/FullmetalAlchemist the 2003 anime version]], though, some of them contain [[spoiler:[[PoweredByAForsakenChild unfinished Philosopher's Stones]]]].
* ''Anime/MagicalGirlLyricalNanohaStrikerS'':
** The [[MineralMacguffin Relics]], super-high energy crystals from . The one implanted in [[spoiler:[[MysteriousWaif Vivio]]]] in particular was mentioned in [[AllThereInTheManual Japanese DVD inserts]] to not only boost her magic on its own, but to also allow her to connect to the Saint's Cradle and fuel herself with nigh-infinite power. And yes, as [[spoiler:''[[SpinOffspring ViVid]]'']] revealed, her [[spoiler:[[OlderAlterEgo Adult Form]]]] is inherent to her and not something given to her by the Relic.
** The Unison Devices: cute little foot-high flying ArtificialHuman girls who can [[FusionDance synchronize]] with magic-users to boost their powers and add elemental effects. So far, we've only seen two, Reinforce Zwei and Agito.
* It turns out that one of the reasons Brew was wanted so badly by both sides in ''Manga/SoulEater'' was its ability to amplify soul wavelengths. Mosquito is not impressed when it turns out the real artifact was in the back pocket of Death the Kid.
* The "Meteor Shard", a MacGuffin recovered from Hell's Gate that changes hands a few times in ''Anime/DarkerThanBlack''. Towards the end of the first series, Amber breaks it in pieces among her followers and uses the bulk of it to power the network of Dolls that guide Hei through the Gate, but later she spontaneously pulls the complete Shard out of her pocket due to the [[RealityIsOutToLunch strange properties of the Gate]]. Then, Hei uses it to [[spoiler:enhance his's power to RealityWarper levels, enabling him to alter matter on a quantum level]]. In backstory one such thing was used to [[spoiler:make a good chunk of South America completely inaccessible]].
* In ''Manga/PokemonSpecial'', [[CheerfulChild Yellow]] is a human example, as when [[BewareTheNiceOnes she]] [[BerserkButton gets]] [[UnstoppableRage angry]], her team of usually wimpy Pokemon has their levels jump up to the mid-80s in response.
* ''Anime/WitchHunterRobin's'' fragment of wisdom has this effect unintentionally, and tends to give the bearer PowerIncontinence with it.
* This is the power of the Boosted Gear, the current owner being the protagonist, in ''LightNovel/HighSchoolDXD''. Every ten seconds, the user gains an enormous boost and the cap depends on whether the host can take the excess power-up.
* ''Manga/NanatsuNoTaizai'' has the Sacred Treasures of the Seven Deadly Sins. They don't increase the amount of power you have, but rather, how much of your own power you can draw out at a time. King describes their use best:
-->''Let's say this lake is the power of one of the Sins... If you use your palm, how much water would you be able to scoop? Right, no mater how much water you have, with just your bare hands, this is what you get. But if you use a weapon, you'd get something like a glass or mug's amount of power. And then... If you use a sacred treasure, you can get a house's worth of power. In other words, you could draw power incomparable with what you could before!!''
* ''Anime/SailorMoon'': This is explicitly the power of the Golden Crystal in the 1990s' anime. It can boost a sufficiently-powerful individual's abilities to [[PhysicalGod godlike levels]]. [[spoiler: It also doesn't require a single user; it can respond to the wishes of an ''entire planet'', making humanity collectively strong enough to break the previous holder's MassHypnosis and destroy her {{Mook}} army.]]
[[/folder]]

[[folder:Comic Books]]
* Marvel Comic's ComicBook/DoctorStrange has some artifacts which function this way and others which do nothing he couldn't do without them (though it frees up his concentration or power to use the artifact rather than his own strength).
* In ''ComicBook/{{BPRD}}'', Liz uses an ancient Hyperborean thing that kinda looks like a light bulb with a spiky thing on top to amplify her [[PlayingWithFire pyrokinesis]] to the point where she can singlehandedly incinerate the mountain-sized Katha-Hem.
* Although it's technological rather than magical, Cerebro fits this role in ''ComicBook/XMen''. It boosts the range and, sometimes, the power level of Professor Xavier's telepathic abilities.
* Franchise/WonderWoman has been shown from time to time using the Gauntlets of Atlas which multiply the wearer's strength and stamina tenfold. Given that Wonder Woman has Superman-class strength to begin with, she's devastating when she wears them. These were eventually passed on. She also used to have Sandals of Hermes that amplified her speed and gave her flight but [[PowerCreepPowerSeep her powers have been upgraded]] to include greater speed and flight.
* ComicBook/TheMightyThor has the Belt of Strength, which doubles his strength and endurance, and Mjolnir, which focuses Thor's innate ElementalPowers. The Belt is straight from the [[NorseMythology source material]]. If need be, Thor could increase the boosting effect by tightening the belt.
* ''ComicBook/GreenLantern'':
** It's been shown multiple times that wearing multiple rings can multiply the effective power of the wearer (as Hal Jordan did during Emerald Twilight). The Alpha Lanterns use this to police the other lanterns by wearing two rings and internalizing their power batteries.
** Blue Lanterns have a symbiotic relationship with Green Lanterns. The willpower of the Greens is necessary to allow Blue Lanterns to do more than just fly and project personal force fields, but a Blue Lantern can also charge a Green Lantern's Ring to 200 percent capacity.
* The Reality Gem of the Infinity Gems, most famous for when Thanos gathered them to make ''ComicBook/TheInfinityGauntlet''. It has other uses, but its prime use is to heavily boost the power of other Infinity Gems, plus make it easier for less-than-godlike beings to use the gems.
* The Sword of Acorns in ''ComicBook/ArchieComicsSonicTheHedgehog'' had this ability when used by powered individuals, such as Mammoth Mogul and Ixis Naugus.
[[/folder]]

[[folder:Fan Works]]
* In ''Fanfic/WithStringsAttached'', the Vasyn turns out to be capable of vastly amplifying spells cast through it. So does Paul, for that matter.
* Turns out the Moon Dial in ''Fanfic/FutariWaPrettyCureBlueMoon'' does more than just [[RetGone erase people from existence]] and reset time. [[spoiler:Kainatrol, after erasing Eiender,]] commandeers it late in the story and undergoes a huge usefulness boost. The only thing it won't work on is somebody with one of its [[DismantledMacGuffin pieces]], though its effectiveness in general is in question considering [[spoiler:the existence of echoes]].
* In ''Fanfic/SweetiesMansion'', Sweetie was given a box that contains a power of an [[WingedUnicorn alicorn]] by the ghost of Madame Fleur so she could use it [[spoiler:to bring back Twilight, Applejack, and Fluttershy from being trapped in paintings.]]
* In [[FanFic/RainboomsAndRoyalty The Dashverse]], it's revealed in ''Hot Heads, Cold Hearts, and Nerves of Steel'' that when [[EvilOverlord Sombra]] converted Tambelon into the Crystal Empire, he designed it so that ''the whole thing'' could drain the Crystal Ponies of their power and transfer it to him, making the whole Empire his Amplifier Artifact.
* In ''WebAnimation/DusksDawn'' the ring on Star Whistle's hoof amplifies her magic, which causes the windstorm and makes her summon magic tornadoes.
* ''FanFic/MegaManDefenderOfTheHumanRace'':
** Wily used his protocol disruptor's signal inducer for Splash Woman, greatly enhancing her brainwashing powers.
** The Jadous Sphere and its shards can greatly power up robots.
* In the Pokemon fanfic ''Fangic/NaturalLiberated'', N's ability to use the attacks of Pokemon is amplified by a device called the Natural Machine, which is the cube on his belt in his artwork. It is made of miniaturized Technical Machines combined into one unit.
* The potion Twilight is working on in ''WebAnimation/DoubleRainboom'' seems to be this. It enhances a pony's special talent to ludicrious extremes, allowing them to pull off feats they normally couldn't. Needless to say, Rainbow Dash can't resist giving it a try, and it ends up increasing her speed and durably to where she ''smashes through the ceiling of Twi's tree home'' on accident after she tries it out, flies around the town at incredible speeds even for her, allows her to fly into ''low orbit'', and gives her the strength to pull off the titler double rainboom [[spoiler:that procceds to ''tear open a worm hole to another universe''.]] Granted, [[spoiler: it does have the nasty side effect of temporarily taking away a ponies natural abilities after it starts to wear off,]] but it still manages to be this trope UpToEleven. Conisdering what happens later in the animation, it's been [[{{WMG}} theorized]] that said potion is actually [[spoiler:an unstable form of [[WesternAnimation/ThePowerpuffGirls Chemical-X]].]]
[[/folder]]

[[folder:Gamebooks]]
* ''Literature/LoneWolf'': The Psychic Ring and the Grey Crystal Ring. They are implied to be useful only because Lone Wolf has strong Psychic Powers already. Their uses are very situational, however.
[[/folder]]

[[folder:Literature]]
* The One Ring in ''Literature/TheLordOfTheRings'' was said to act like this: it granted its wearer power based on the wearer's stature. The more powerful you were, the more powerful the Ring would make you. It was originally created by Sauron as a means to make his already formidable MindControl powers strong enough to take over the other Rings of Power (and through them, their wearers). That it also served as a SoulJar for Sauron was a nice little side-effect. This is why it was justified that the little hobbit Frodo would be the one to carry it to Mordor instead of someone more powerful like Gandalf. Worst case scenario, Gandalf with the Ring would become just as terrible as Sauron, while a hobbit would just become a little ghoul like Gollum.
* Several in the Franchise/StarTrekNovelVerse.
** In ''Literature/StarTrekTheLostEra'', there are the masks upon which Oralian recitation masks are based. The mask in ''Well of Souls'' is the best example. Useless to those who are not psi-sensitive, it enhances and focuses the talents of empaths and latent telepaths. It is designed to allow members of its planet's ruling family to enhance their psi talents to the degree that their mind can serve as a vessel for the spirit lifeform Uramtali. Without the mask, these talents would no longer be adequate, as the ruler's genes were diluted by centuries of inbreeding. In the StarTrekDeepSpaceNineRelaunch, there's the ''pagh'varam'' (Bajoran for "soul key") which also serves to boost latent telepathy. It's actually a fragment of a Bajoran Orb of the Prophets.
** The Selakar from ''StarTrekDepartmentOfTemporalInvestigations'' use crystals that amplify their psionic talents.
* The Kaiburr Crystal in the Franchise/StarWarsExpandedUniverse novel ''SplinterOfTheMindsEye'' can greatly increase the Force ability of any Force user who touches it. However, it only worked so long as the crystal remained near the temple of its origin.
* '' Literature/TheWheelOfTime'': ''angreal'' and ''sa'angreal'', magical LostTechnology that boosts the amount of power a channeler can draw upon. They usually have buffers to prevent the user from going too far, but not always. The latter are just a stronger variety of the former. The strongest are a [[GenderRestrictedAbility male-female]] pair whose combined capacity could crack open the planet; when they finally get put into use, every channeler on the planet can sense it. The runners-up include the sword ''Callandor'' (usable by men, primarily wielded by [[TheChosenOne Rand]]), Vora's wand (usable by women, primarily wielded by Egwene) and the scepter ''Sakarnen'' (usable by men, wielded by [[spoiler: Demandred]]).
* Aside from its other powers as a soul-eating, universe-annihilating supersword, [[TheElricSaga Stormbringer]] boosted Elric's magical and physical strength, compensating for the Albino Emperor's own fragile health.
* In ''[[Literature/KnownSpace World of Ptavvs]]'' by Creator/LarryNiven, Kzanol the Slaver attempts to retrieve his amplifier helmet, which will increase his natural ability to control the minds of a relatively few slaves to the point where he will be able to mentally control ''the entire solar system.''
* The Lens of Arisia, from Creator/EEDocSmith's ''Literature/{{Lensman}}'' series, fits this trope. Kim Kinnison has vast psychic powers on his own after being converted into a [[spoiler:Second-Stage lensman]], but his Lens gives him vastly hugely mind-bogglingly big psychic powers.
* In Creator/MarionZimmerBradley's ''Literature/{{Darkover}}'' stories, [[PowerCrystal matrix crystals]] could greatly increase psionic abilities.
* All wands (most notably the Elder Wand) in ''Literature/HarryPotter'' amplify the strength of a wizard.
* Any jewel in the ''Literature/InheritanceCycle'' can be turned into such an artifact. Just load them up with energy, and you can draw on that energy later to boost your power.
* Jon-Tom's dual-necked, guitar-like duar in Creator/AlanDeanFoster's ''Literature/{{Spellsinger}}'' series is sometimes this, sometimes not. In the first few novels, it's implied that duars are fairly common instruments in the series' AlternateUniverse setting (in the first book, Jon-Tom picks his up from a sack of musical instruments dropped by by a fleeing merchant, and his companions act as if it's a common item), and it merely functions as a [[MagicFeather focal point]] for his latent magical powers. In later novels, however, it's indicated that the magic comes from the duar ''itself'', which has been [[{{retcon}} retconned]] into a rare and valuable item, and Jon-Tom's facility with it is more practice than anything else.\\\
On the other hand, there are quite a few inconsistencies between the first books and the later ones, including a number of increasingly obvious and basic errors such as the names (and number) of Mudge & Weegee's kids changing from one book to the next, so it may just be that Foster didn't remember (or keep very good notes on) what he'd written in the previous volumes. Alternately, considering some of the world-shaking effects Jon-Tom achieves with his duar in the first few books, it's conceivable that the instrument ''became'' magically-empowered as a result of these events. At least one of his feats, the summoning of M'nemaxa, can be performed only once in a wizard's lifetime, which would explain why he can't just repeat the process to enchant another duar.
* The ''Literature/YoungWizards'' series has the ''Book of Night with Moon'', a supernatural book which describes the entirety of existence. Rather than increasing the strength of the spells a wizard casts, it makes it so that even the most complex and difficult of spells are easy to cast. However, some spells did receive a power boost just from being cast near the book, such as the time shift spell working better than expected.
* ''Franchise/{{Mistborn}}'' series by Creator/BrandonSanderson:
** Duralumin works like this for an Allomancer's powers.
** Later books in the series introduce nicrosil, which can be used amplify another Allomancer's powers in the same way as duralumin is used for one's own.
* This is what [[spoiler:the ''shadowlight'']] does in ''[[Literature/CiaphasCain Duty Calls]]''. Exposure to it awakens latent psyker abilities, but without proper containment it warps you to death.
* The children's novel, ''Literature/TheHedgeWizard'', is about a young boy who set out to become a wizard. He turns out to have no real talent for magic, but is revealed to function as one of these, greatly amplifying the magical power of any other wizard(s) he is in contact with or any spell he joins in casting (spells he tries to cast on his own are usually either weak or backfire-prone)
* Bluestone is essential to the Singers in ''Literature/TheEchoriumSequence'', as it amplifies their [[MagicMusic Songs of Power]]. Its evil counterpart khiz-crystal shares this property.
* Spikard Rings from ''Literature/TheChroniclesOfAmber'' -- incredibly powerful rings of ancient and mysterious origins, connected to multiple sources of magic powers located around TheMultiverse, that allow their users to create any magical spells they need in an instant - more practical and powerful than most magic in the universe. Merlin theorizes that at full power a person armed with one can even damage manifestations of Pattern and Lorgus. However [[spoiler: they seems to be addictive and can be themselves targeted by any magic - Dara and Mandor enhances a spikard, set for Merlin to pick, with mind-controlling spells and it would work, if Bleys hadn't replaced it with another spikard]].
* ''Literature/TheDresdenFiles'': A wizard's "focus" is an item enchanted in such a way that makes casting spells easier. They aren't required, but most wizards carry at least one around anyway. Harry's full toolkit involves a staff (for most spells), a blasting rod (the fire spell he uses for most direct "kaboom" attacks. ''Can'' be done with staff, but the rod's better as it's specifically designed to channel that one fire spell into a tight beam of DeathRay.), a shield bracelet (force field for protection), force-collecting rings (every time he moves some kinetic energy is collected. He can release it as a powerful shockwave.), and a pentacle necklace (often uses it as flashlight. However, with faith-based magic the symbol's gotta be something you believe in; a symbol of magic works for him as a cross would work for a Christian against [[OurVampiresAreDifferent some breeds of vampire]] among other things.) All these simply make it easier to call up and direct power; he's had to use many spells without the appropriate focusing tools, but finds it much more difficult, draining, and harder to control. He gets a bit better at it as time goes on, and these days is almost ''never'' lucky enough to have his full arsenal at hand. Also, [[spoiler:Elaine]] carries a chain, and [[spoiler:Molly]] carries a pair of wands.
* ''Literature/TheGirlWhoWouldBeKing'' has a stone carved with three rings and a raven, which increases Bonnie and Lola's power when they're in contact with it. [[spoiler:Bonnie eventually discovers that it's not the stone itself that amplifies their powers, but the symbol carved on it]].
* ''Literature/TheSpellmongerSeries'' has Irionite/Witchstone, an incredibly rare form of amber that can amplify magical energy by a ridiculous degree. It is so powerful that just owning a piece basically makes you more powerful than every non-irionite owning mage on the planet.
* The Dominion Jewel in ''Literature/SongOfTheLioness''. It's been used through history as a tool by [[TheGoodKing benevolent rulers]] and tyrants alike.
[[/folder]]

[[folder:Live-Action TV]]
* ''Franchise/PowerRangers''
** Various versions of the Battlelizers.
** On top of that are the [[Franchise/SuperSentai Sentai]] SWAT Mode, the Megatector, Super Geki Claw, the [=InrouMaru=], the Miracle Headders, and the GB Custom Visor most recently.
* ''Franchise/KamenRider'' has had some fun with this recently. Listed below.
** Series/KamenRiderRyuki and [[EnsembleDarkhorse Knight's]] Survives.
** The Faiz Blaster from ''Series/KamenRiderFaiz''.
** The face cards (Fusion Jack, Absorb Queen, and Evolution King) in ''Series/KamenRiderBlade''.
** The Armed Saber in ''Series/KamenRiderHibiki''.
** The Hyper Zecter(s)]] and [[DoubleWeapon Perfect Zecter]] from ''Series/KamenRiderKabuto''.
** ''Series/KamenRiderDenO''[='s=] K-Taros.
** ''Series/KamenRiderKiva''[='s=] Tatsulot.
** The K-Touch from ''Series/KamenRiderDecade''.
** ''Series/KamenRiderDouble'':
*** Xtreme Memory.
*** The ''Accel'' DTV movie introduces the Gaia Memory Enhancement Adapter, which upgrades any Memory plugged into it. Both the BigBad and Accel make use of it, with Accel gaining his SuperMode Accel Booster from it.
** The purple Core Medals in ''Series/KamenRiderOOO''.
** The States Switches -- Elec, Fire, Magnet, Cosmic, Double Rocket and Fusion -- in ''Series/KamenRiderFourze''.
** The Dragon Rings, Drago Timer, and the Infinity Ring in ''Series/KamenRiderWizard''.
* ''Series/{{Warehouse 13}}'' is full of these. Examples include Creator/BenjaminFranklin's ring (amplifies the human body's bioelectricity to turn a hand into a flashlight; also works to turn a laser cutter into a lightsaber) and lightning rod (amplifies the energy level of any attached device), a James Braid's chair (amplifies the innermost desires of anyone who sits on it), Spine of the Saracen (amplifies speed, strength, durability, and angel, also grants the ability to deliver lethal electric shocks), Alessandro Volta's lab coat (amplifies "biomagnetic attraction").
* ''Series/WizardsAndWarriors'' In this series both Wizards and Witches make use of crystal pendants called 'Monocles' to boost their innate magical ability. The evil Archwizard Vector manages to make do without his when it is stolen by the evil Prince he serves (though Vector still very much wants it back).
[[/folder]]

[[folder:Pro Wrestling]]
* Wrestling/PaulBearer's urn seemed to be this for Wrestling/TheUndertaker.
[[/folder]]

[[folder:Tabletop Games]]
* To avoid a list of 20 billion entries, let's just say: nearly all of them, and move on. Since any item that grants a bonus to anything (well, anything that's ''beneficial'' anyway) qualifies as one. This is in fact one of the peculiarities of Tabletop [=RPGs=], deriving especially from ''TabletopGame/DungeonsAndDragons''. In the fantasy fiction the original {{RPG}}s were based on, amplifier artifacts are the exception, not the rule, with most magical items and artifacts granting new abilities rather than enhancing existing ones, but in these games by far the most common magic item ability is "pluses". While useful for game balance, it's directly responsible for the style of gameplay that amounts to constantly questing for more items to give you better pluses, and many people feel it makes magic items rather bland. Video games inherited this style of magic items directly from Tabletop [=RPGs=].
[[/folder]]

[[folder:Toys]]
* Several objects or substances in ''Franchise/{{Bionicle}}''. Antidermis, the substance that makes up the Makuta species, acts as a sort of steroid to Brutaka's race. The Nui Stone drains the elemental energies of nearby beings, giving its owner more power. There are also elemental masks which can enhance the extant elemental powers of their wearers, and the Mask of Elemental Energies can even replenish them. The Mask of Fate unlocks the physical potential of their bearers -- it boosts their athletic abilities to their limits, but doesn't allow feats that the wearer's species would be physically unable to perform.
[[/folder]]

[[folder:Video Games]]
* Wayne in ''VideoGame/LostPlanet'' had a attachment for his device to help him unleash the full potential of the mechs in the game. For no reason other than the plot he didn't put it on when he first received it and didn't use it until the final boss. Lucky too [[spoiler: as it wiped his memory.]]
* The Ray Sphere from ''VideoGame/InFamous'', the device that started it all [[spoiler:kills everyone in a six-block radius to accelerate the development of the user's powers.]]
* ''VideoGame/CliveBarkersUndying'' features disposable items known as Amplifiers, which can be used to take one of your magic spells up one level. There's also the Gel'Ziabar Stone, which boosts all your spells one level if you use it in concert (though you effectively have no gun if you choose to do this).
* The Yatgy Stone in ''VideoGame/{{Nocturne}}'' is an artifact that massively increases a vampire's power, while rendering him immune to normal vampiric weaknesses. The heroes set off on a mission to reclaim it from a vampire lord who's recently stolen it. They succeed, only to lose the stone to its original vampiric owner, who (unlike the vampire who took it from him) thankfully doesn't have any apocalyptic plans for it.
* In ''VideoGame/TheWorldEndsWithYou'' Kitanji gives his Reapers O Pins, which are supposed to make them stronger [[spoiler:This is a subversion. All it does it let them be mind controlled.]]
* In ''VideoGame/GotchaForce'', once G Red recovers his missing code that the Death Force stole from him, he goes from being the JackOfAllStats {{to|okALevelInBadass}} being one step below GameBreaker.
* Several held items in the ''Franchise/{{Pokemon}}'' series, most notably the Light Ball, designed to give [[SeriesMascot Pikachu]] a massive boost in Special Attack.
* From ''VideoGame/SystemShock2'' we have various implants that increase various stats and skills. The PSI-Amplifier from the same game is technically this.
* [[AllThereInTheManual According to the backstory]], the Psi Emitters in ''Franchise/StarCraft'' amplify the "signature" of a telepath, allowing them to be heard over huge distances, at least by the Zerg. Also, Protoss [[PowerCrystal Khaydarin crystals]] amplify the user's psionic abilities in various ways, such as the Zealots' bracers, which allow them to form Psi Blades.
* ''Franchise/SonicTheHedgehog'':
** Chaos Emeralds. It's been commented by the writers of SEGA that they don't simply grant new powers, but amplify what one already had, as well as modify a few powers occasionally.
** The Chaos Emeralds had the Amplifier Artifact treatment pulled on themselves by the master Emerald to form the Super Emeralds.
** The series is almost built around them when you throw in almost every other collectible item. The World Rings, Sacred Swords, Sol Emeralds, etc, etc...
* ''VideoGame/MagicRampage'': The Runes used to upgrade magic-based weapons.
* The Evokers from ''VideoGame/{{Persona 3}}'' only work if someone has the "potential" to summon a Persona to begin with, [[spoiler:even if that potential is artificially induced.]] The Evoker just makes things much easier.
* Several throughout the ''Franchise/MortalKombat'' franchise, most notably the Dragon Medallion and suit of ancestral armor the younger Sub-Zero picks up in ''VideoGame/MortalKombatDeadlyAlliance'' and ''VideoGame/MortalKombatDeception''.
* ''VideoGame/{{Dragonfable}}'': You have multiple Elemental Orbs, Weapons of Doom, the Dragon Amulet, etc.
* In ''VideoGame/{{Dominions}}'', many magical artifacts are of this nature, doing such things as assisting casting or lessening magic resistance.
* Most of the items in ''VideoGame/LeagueOfLegends'' (and, one might imagine, other MultiplayerOnlineBattleArena games with similar fantasy trappings) work like this. Despite looking like ordinary weapons and equipment, they have their effects regardless of whether they would be physically possible to wield simultaneously. For example, among the Infinity Edge, The Bloodthirster, and the Phantom Dancer items, four swords are depicted; yet completely humanoid, two-armed champions are able to take advantage of them all simultaneously while attacking with guns or bows.
* The Elder Artifacts in ''VideoGame/RuneScape'' are partial versions of this. In addition to acting as sources of power from which the gods draw their godhood, each artifact seems to have a specific function. There are 12 in all.
[[/folder]]

[[folder:Web Comics]]
* ''Webcomic/GunnerkriggCourt'':
** The Blinker Stones can amplify and focus their users' PsychicPowers. And some particularly talented psychics can learn to replicate these effects without the stones.
** Fairies as magical creatures approve using a blinker as an instant campfire, but [[spoiler:consider the use for mere [[AstralProjection look around out-of-body]] to be for mentally weak]].
* The Power Booster Rod of ''Webcomic/ItsWalky'' is ExactlyWhatItSaysOnTheTin. (Okay, no, it's not- it contains a preset amount of energy that can be tapped and used by its wielder. But the amount that can be tapped at one time ''is'' proportional to the starting power level of the wielder, so a super-powered character can cause more havoc than a normal one.) [[note]]It's also less of a rod and more of a tree branch. So yeah, not really Exactly What it Says on the Tin[[/note]]
* The aptly-named amplifier in ''Webcomic/{{Juathuur}}'', and Soveshei's serum.
* This is the effect that being {{touched|ByVorlons}} by the Sovereign of Sorrow in ''CaptainSNES'' gives. A given's sprite's abilities will be greatly enhanced, at the cost of [[WithGreatPowerComesGreatInsanity soul-crushing sorrow]]
* The MagiTek Implants in ''Webcomic/ElfBlood'' generally do not add new abilities to their host, but rather improve upon their existing natural talents. Examples include a Sympathetic Magic booster to improve the effects of spells, and enhanced strength.
* ''Webcomic/EerieCuties'' has an artifact that stimulates [[HornyDevil succubus]] powers. Three guesses at how ''that'' [[http://www.eeriecuties.com/strips-ec/normal_pair looks]]?
* Tedd's [[http://www.egscomics.com/?date=2013-01-21 gauntlet]] in ''Webcomic/ElGoonishShive'', acts like a capacitor, it drains and stores his limited magic energy over a long period of time then, when he needs a power boost, it gives it back all at once.
* In ''Webcomic/ZachMannAndSD'', S.D.'s hat amplifies how fast he heals. Unfortunately, it also amplifies his stupidity...
* ''Webcomic/TheOrderOfTheStick'', being based on ''D&D'', has most common magic items being of this kind. Notably, Roy's Belt of Giant Strength, Elan's Belt of Charisma or V's Ring of Wizardry. This is Lampshaded by Haley with a Potion of Glibness: she takes it from Elan to use herself, because while it would make him a good liar, she's already a good liar so it will make her an ''utterly amazing'' liar.
[[/folder]]

[[folder:Web Original]]
* In ''Roleplay/TheGamersAlliance'', the swords Dawn and Dusk have magical powers which are fully unleashed only when they are used by their chosen wielders.
* The cybaspheres from the web fiction serial ''Literature/DimensionHeroes'' both give the heroes new powers, as well as amplifying their old ones.
* The self-ware black scythe from ''TrintonChronicles'' can act as this to some people.
* The Wiki/{{SCP|Foundation}}-914 acts this way on its "Fine" and "Very Fine" settings. Just pray that it doesn't manage to overshoot...
** [[http://www.scp-wiki.net/scp-248 SCP-248]] are stickers from a corporation that produces [=SCPs=]. These stickers have "110%" printed on them, and attaching them to anything will boost performance to, you guessed it, a 110% percent. This also includes senescence.
* ''Literature/TheQuestportChronicles'' has Gaudior's Horn, which powers spells up so much that a powerful sorcerer uses it to [[spoiler:destroy Questport]].
* In the ''{{Global Guardians|PBEMUniverse}}'' verse, the seven Atlantean moonstones amplifies telepathic abilities, strengthening even the weakest of psychics to the point of being able to mind rape anyone on the planet. However, [[WithGreatPowerComesGreatInsanity the user becomes more and more paranoid and detached from humanity the longer he uses the stone]].
[[/folder]]

[[folder:Western Animation]]
* The Arch Magus in ''WesternAnimation/{{Gargoyles}}'' uses three magic items to accomplish both amplify his powers and gain new ones. The Phoenix Gate to teleport and time travel, the [[GreatBigBookOfEverything Grimorum]] to give him many more spells, and the Eye of Odin to boost his natural magic power and let him handle the first two without having a SuperPowerMeltdown. Guess which one was the key to defeating him?
* An episode of the ''WesternAnimation/DungeonsAndDragons'' cartoon had an Amplifier Artifact '''location''', The Dragon's Graveyard, where the heroes' weapons were forged. When they were used there, they had greater effect, allowing the heroes to overpower the BigBad they were normally forced to run from.
* ''Anime/TransformersCybertron'':
** "[[ByThePowerOfGreyskull Cyber Key Power!]]" A Transformers in this can gain temporary power boosts, in various forms, by using his or her Cyber Key. Additional or bolstered weapons, turbothrusters, and the like. However, their fuel consumption is typically increased. An interesting form of this trope. Cyber Keys should not be confused with their bigger MacGuffin - AppliedPhlebotinum hybrid cousins, the Cyber ''Planet'' Keys. (Sadly the toymakers at Hasbro made this very mistake. Were they even allowed anywhere NEAR the episodes?)
** Minicons did this as well, which was why they were so sought after. Most unlocked new abilities or weapons in robot mode, but in vehicle mode they were often said to increase speed as a bonus.
** Powermasters did this in G1... except in most Japanese continuities, where the large robot body was non-sentient and controlled entirely by the Powermaster partner.
* Starmetal in ''WesternAnimation/ConanTheAdventurer'' amplifies magic-users power.
* The Eliacube in ''WesternAnimation/{{Wakfu}}'', a piece of {{Precursor}} tech which exponentially increases the power of magical abilities at the cost of LifeEnergy ([[PoweredByAForsakenChild not necessarily the user's]]).
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** The Elements of Harmony. As it turns out, there are reasons both [[PowerLevels simple]] and [[BatmanGambit complex]] that it was Twilight Sparkle and no other pony who ended up on the quest for them.
** We find out later that ThePowerOfFriendship is ''quite'' strong without the Elements of Harmony themselves, as it alone was able to incinerate three [[EldritchAbomination Windigos]] who had the power to freeze the world. It seems the Elements just amplify this power to the point it can OneHitKO ''[[DidYouJustPunchOutCthulhu gods]]''.
** [[spoiler: The Crystal Heart]] from the third season premiere [[spoiler: provides a similar function. As long as the Crystal Empire's inhabitants keep their spirits up, their love and cheer power the Heart and allow it to protect the Empire.]]
** The episode "Magic Duel" brings us an evil version in the Alicorn Amulet, a powerful artifact that gives the wearer nigh-godlike magical power while [[ArtifactOfDoom slowly corrupting them with every spell they cast]].
* ''WesternAnimation/ThunderCats2011'':
** The Eye of Thundera serves as an amplifier as well as a PowerCrystal for the Sword of Omens. The Sword, though crafted from enchanted metal, is little more than a heavily-ornamented dagger either without the Eye, or in resting state. When a ByThePowerOfGreyskull is uttered, the Eye activates, and the sword [[RetractableWeapon extends]] to longsword length. [[spoiler:Other crystals also exist, that can transform simple gauntlets into full suits of AdaptiveArmor.]]
** Averted with the Sword of Plundarr, the evil bigger brother of the Sword of Omens, forged from the same metal and infused with evil power in its own right. It is strongly implied that the Sword of Plundarr without a power crystal is just as powerful as the Sword of Omens with the Eye of Thundera. A big plot point is keeping Mumm-Ra from getting the Eye of Thundera which if mated with the Sword of Plundarr, would make it the [[InfinityPlusOneSword most powerful weapon in the universe.]]
* Mystic Hearts in ''WesternAnimation/{{WITCH}}'', most notably the Heart of Kandrakar which the Guardians use to power up (we see that the previous generation of Guardians, who no longer have the Heart, can still use their powers but only at a greatly reduced level). Every dimension has a Heart that generates ''all'' of its magical energy, so having sole control of one quite desirable, and quite dangerous even for good guys. (Yes, that includes this dimension, but the Heart of Earth is [[spoiler: Lillian]]. Thankfully, Nerissa's attempt on ''that'' one is thwarted.) In the second season, BigBad Nerissa steals and combines the Hearts of Meridian and Zambala in order to create a new Amplifier Artifact called the Seal of Nerissa, turning her [[spoiler: and former BigBad Phobos when he in turn steals it from her]] into one of the most powerful characters in the series.
* The Series Five brain implants in ''WesternAnimation/AdventuresOfTheGalaxyRangers'' didn't give the title heroes their particular abilities; they just amped up what the Rangers already had. This was aptly demonstrated in the BroughtDownToNormal episode "The Power Within".
* Cyborg of ''WesternAnimation/TeenTitans'' once had a super-processing chip named the Max-7 installed to increase his speed, strength, and intelligence. Unfortunately, he overloaded it and had to have it removed.
** The biggest problem with the chip was that, as he kept overclocking it to increasing his abilities and intelligence... [[CyberneticsEatYourSoul he did so at the expense of his humane characteristics, essentially turning him into an emotionless robot]]. Overloading it into uselessness restored him to normal.
[[/folder]]

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