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1Any skill or ability that only a select few know how to/can use, from magic to martial arts to metallurgy techniques. Even the art ''itself'' might be unknown to the world at large, but the crux of the trope is that the know-how to use it is limited to a relatively isolated group or even to a single person. Some Secret Arts aren't even particularly jealously guarded and only remain secret via their sheer obscurity.
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3Sometimes the technique is similar to LostTechnology being a SupernaturalMartialArts techniques, [[FunctionalMagic magical spells]] or just [[Manga/YakitateJapan bread-making techniques]] that were invented eons ago but have been lost/buried/forgotten/not quite destroyed for a variety of reasons.
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5Perhaps their [[AndManGrewProud civilization collapsed]], or the master only trained one top student, but he died before passing on the secret, or these techniques were simply were too powerful and/or dangerous and needed to be [[DangerousForbiddenTechnique sealed away]]; the point is, no one has seen and/or heard about them in a very long time. They will always, however, be superior in some way to their modern counterpart, which will often make them the subject of a lengthy search quest by heroes or villains to further the plot.
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7Usually, one of the benefits of joining TheOrder. Can be (or encompass) the DangerousForbiddenTechnique. TheDarkArts are often this due to being outlawed. Often taught by a type I or III ObsoleteMentor.
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9Often overlaps with SignatureMove (especially where VideoGames are concerned), with the difference being that a Signature Move is the one the character is ''best known for using'' (secret or otherwise), while a Secret Art is the one that ''only they know how to use'' in the first place.
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11Compare SupernaturalMartialArts, SuperEmpowering, OnlyTheKnowledgableMayPass, and TheChosenMany. Contrast EveryoneIsASuper.
12----
13!!Examples:
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15[[foldercontrol]]
16
17[[folder:Anime & Manga]]
18* ''VisualNovel/TriangleHeart3'': The Fuwa-ryuu sword style, exclusive to the Takamachi family.
19* ''Manga/{{Naruto}}'' has a few forbidden Jutsu sealed away in scrolls kept heavily guarded due to them being either {{Dangerous Forbidden Technique}}s or TheDarkArts. The series also has Secret Jutsu, which are usually carefully guarded techniques passed down a clan.
20** Kirigakure has a strict secrecy policy regarding the abilities of the previous Mizukage. By the time of the Fourth Great Shinobi War, the shinobi from Kirigakure are only familiar with the jutsus of the Fifth Mizukage. The resurrected Second Mizukage realizes how their policy backfired because nobody from his village knows how to fight against his own jutsus, regretting that he didn't left more legends about him behind.
21* ''Manga/FistOfTheNorthStar'' has a number of examples:
22** Hokuto Shinken, a martial art that results in the instant death of the opponent, is known only to Kenshiro, Raoh, Toki and Jagi. This is actually enforced by the practitioners of the style, as Hokuto Shinken is only allowed to have one successor, and those who aren't chosen can either stop using it or be made unable to use it (by death, destruction of their arts or memory wipe depending on what the successor decides).
23** Hokuto Ryuken, Hokuto Shinken's sister art, is known only to one master and his three apprentices.
24** Nanto Seiken has 108 styles, each with a master and (theoretically) a small number of minor practitioners. The strongest style enforces it, as there can be only a successor and an apprentice who ''has'' to kill his master to succeed him.
25** Gento Kou Ken has only three (five in the anime) known practitioners.
26* There is a fighting style known as "Rokushiki" in ''Franchise/OnePiece'' that utilizes six techniques, namely [[DoubleJump Geppou/Moon Walk]], [[SuperToughness Tekkai/Iron Body]], [[RazorWind Rankyaku/Tempest Kick]], [[FlashStep Soru/Shave]], [[FingerPokeOfDoom Shigan/Finger Gun]], and [[NonchalantDodge Kami-e/Paper Art]]. The members of [=CP9=] were practitioners of this style. There are a couple of high-ranking Marine officers that can use some of them, as well. But, this trope truly comes into play in the case of [=CP9=]'s Rob Lucci, who knows a hidden seventh technique known as Rokuougan/Six King Gun. Only those who have completely mastered the six other techniques can learn it.
27* In ''Manga/FairyTail'', the dragon slayers all have Secret Arts: for example Natsu's "Crimson Lotus: Exploding Flame Blade", Gajeel's "Karma Demon: Iron God Sword", or [[spoiler:Wendy's "Shattering Light: Sky Drill"]].
28* In ''Literature/{{Slayers}}'', cooking dragon meat is a secret art, and you have to endure a harsh apprenticeship from an OldMaster to learn how to do it. It turns out it's incredibly difficult to catch dragons and slay them with kitchen implements, and it's even harder (and incredibly time-consuming) to cook their meat properly and remove all poison from it.
29* In ''Manga/FullMetalAlchemist'', Mustang's flame alchemy is shown to be this in a flashback sequence, with the formula for it being tattooed onto the back of a flame alchemist's chosen second (in Mustang's case, it's Hawkeye) and never written down so that only the rightful heir to flame alchemy can ever learn it. It's a good thing, considering how enormously destructive flame alchemy is demonstrated to be throughout the series.
30* ''[[Manga/JojosBizarreAdventure JoJo's Bizarre Adventure]]'' has Hamon, an energy used in the ancient form of martial arts, Sendō, which utilizes power that is near-identical to the energy of the Sun through self-controlled breathing. Most of the world is ignorant of it, with only a small percentage of Humanity knowing of it, with an even fewer number even capable of learning it.
31[[/folder]]
32
33[[folder:Comic Books]]
34* ComicBook/LadyShiva knows several martial arts skills that no one else knows due to her killing the last master of the practice, and her signature move is the "Leopard's Blow" is also used only by her.
35* ''ComicBook/{{Robin|1993}}'': Tim is the last student of an ancient holistic Tibetan martial art which then dies out in its complete form along with it's last master as Tim never completed his training and the master's longest lasting student was only interested in select parts of the fighting aspects of it, rather than the meditation and healing aspects.
36[[/folder]]
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38[[folder:Film]]
39* ''Franchise/StarWars'': The Force, though the Franchise/StarWarsExpandedUniverse and [[Franchise/StarWarsLegends Legends]] show that the Jedi Order doesn't have quite as strict a monopoly on Force abilities as they'd perhaps like.
40* Five ''Point'' Palm Exploding Heart Technique from ''Film/KillBill'', which even Bill was surprised was taught to someone else by Pai Mei.
41[[/folder]]
42
43[[folder:Literature]]
44* In ''Literature/ABrothersPrice'', the so-called "Paths of Pleasure" is treated as this. Jerin is asked whether his grandfather passed it on to him. It is, essentially, the art of [[SexGod keeping all wives happy]] in a [[ExoticExtendedMarriage polygynous marriage.]] Jerin is very embarrassed when asked about it, he doesn't think it should be discussed in public.
45* ''Literature/TheDestroyer'': Sinanju. Only two people in the world know it.
46** Within the first hundred or so books or so (literally; its a long series), we've run across a few others. In the history of the Korean village the art's home to, there have been a few rogue students and at least one second son who received surreptitious training and chose self-exile. In fact, Sinanju actually turns out to be in Remo's ''genetic'' heritage... but still, it's a pretty well-kept secret and there are probably at most three masters of it alive at any given time.
47* Literature/{{Discworld}}'s[[spoiler: Lu-Tze's Deja-fu.]] Of course the monks don't know it, he hasn't taught them!
48* ''Literature/EarthsChildren'': The Sharamudoi people have a secret technique for making chamois skin very soft and pliable, and only members of their cave are allowed to know it. This is done for economic reasons--soft chamois is a valuable commodity and other tribes trade things they want for it.
49* In the ''Literature/YoungWizards'' series, every entity in existence (people, planets, universes, etc) has a "kernel", a wadded-up line of symbols from the LanguageOfMagic which both describes and ''is'' the laws by which that entity operates. Since letting any random wizard who felt like it alter a planet's kernel would be a Bad Idea, the knowledge and training of how to manipulate kernels is provided on a strict need-to-know basis. On any given planet populated by sentient beings, there's probably only one or two wizards who can do kernel manipulation.
50* In ''Literature/AnInstinctForWar'''s story ''A Sword is Drawn'', the emperor gives a story how sword manufacture used to be known by a few who kept their methods secret. As it turned out, these "sword masters" knew their art as a ritual than a craft. If they missed one step, the swords turned into abominations and no one knew why. When the art of swordmaking was finally known, it was realized that there was nothing special about the art--anyone could make them. More and better swords were able to be made. The emperor uses this story to support his point that a disgraced general is not a craftsman of war, but an unimaginative follower to the principles of war.
51* ''Literature/CoilingDragon'': The [[ExactlyWhatItSaysOnTheTin Straight Chisel School]] of stonesculpting allows Earth-style magi to use their sense of stone to carve without the use of precision tools. [[SpiritAdvisor Doehring Cowart]] developed it during his life, but [[TheHero Linley]] is the only person to have learned it.
52* ''Literature/JourneyToChaos'': Magic has a lot of these.
53** In ''Literature/AMagesPower'', Dengel teaches Eric a tracking spell that cannot be blocked or obstructed by any means. This makes Eric the first person to ''ever'' learn it because it is AwesomeButImpractical. Dengel never bothered to name it because he knew no one he taught in his previous life time would ever use it.
54** In ''Literature/LoomingShadow'', Grey Dengel teaches Eric "Mana Conversion" which enables him to dissolve physical matter into {{mana}} for use in spells. No one else knows this because it is an EnlightenmentSuperpower that few can achieve with their sanity in tact.
55* ''Literature/TheLostFleet'' has a non-supernatural example in the form of most advanced SpaceNavy formation tactics, which has become a lost art by the start of the series proper for the equally mundane reason that getting really good at it takes hundreds of hours of intensive training. As the Alliance-Syndicate Worlds war deteriorated into an increasingly bloody stalemate and casualties mounted, the less time there was to train new officers to replace those who fell in battle and the more abbreviated their training became, a vicious cycle that ultimately led to the two opposing sides launching [[CannonFodder barely-trained crews in poorly-built ships]] into [[AttackAttackAttack wasteful headlong charges]]... Until recently-defrosted HumanPopsicle Captain John Geary, who enlisted in peacetime and had the benefit of a full-length Academy syllabus ''and'' several large-scale fleet exercises, ends up in command of the titular Lost Fleet.
56[[/folder]]
57
58[[folder:Professional Wrestling]]
59* The Wrestling/{{Chikara}} Special, as submission hold developed by Wrestling/MikeQuackenbush that he would only teach to {{tecnico}}s that worked for the promotion. Wrestling/ChrisHero had to send [[TheMole a mole]] into the tecnico locker room to pass it on to him but the mole was detected before the counters and escapes could also be learned.[[/folder]]
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61[[folder:Tabletop Games]]
62* ''TabletopGame/{{Battletech}}'': The [[https://www.sarna.net/wiki/Phantom_%27Mech "Phantom 'Mech"]] skill, which was a technique introduced early in the game's timeline when the setting leaned more heavily on the romanticism end of the RomanticismVersusEnlightenment scale. In-universe, the technique was known only to Morgan Kell and his rival Yorinaga Kurita, and allowed the user to become impossible to target using 'Mech sensors. With the setting becoming standard MilitaryScienceFiction instead of 'ScavengerWorld medieval Europe in space', the skill disappeared from the lore and no-one else in the setting is known to have ever possessed it.
63* ''TabletopGame/{{GURPS}} Dungeon Fantasy'': One of the requirements for the {{Ninja}} class's powers is that they keep their powers and the workings behind them a secret, or else they will stop working.
64* This extends to the entire field of mechanics in ''TabletopGame/{{Warhammer 40000}}'', where basic repair procedures have turned into complex rituals (burning incense before oiling a gear, for example). The techpriests get mighty miffed when people get stuff working without their assistance.
65[[/folder]]
66
67[[folder:Video Games]]
68* ''Franchise/DragonAge'': The Templars' anti-magic abilities are exclusive to them among the Ferelden warriors. Also, BloodMagic.
69** The golem-making.
70* ''Franchise/TheElderScrolls''
71** {{Necromancy}} tends to become this in times and places when it is [[TheDarkArts illegal]]. Practitioners must meet in secret to share knowledge and related paraphernalia.
72** In ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]'', BigBad Alduin has several [[LanguageOfMagic Thu'um]] [[MakeMeWannaShout shouts]] unique to him. SLEN TIID VO, the shout he uses to revive dead dragons, is exclusive to him. His [[DeathFromAbove Meteor Storm]] shout is also one (though "[[ShockAndAwe Storm Call]]" is very similar in function and is obtainable). Another is "VEN MUL RIIK", "Wind Strong Gale", which shrouds an area in thick concealing mist.
73* The "Enigmatic Engineering" perk in ''VideoGame/{{Stellaris}}'' makes it impossible for anyone to reverse-engineer your technology. Making any unique technologies you've gained through special events like Dragonscale Armor or Psi-warp drives this.
74* ''Franchise/StreetFighter'': The Ansatsuken fighting style
75* ''Franchise/TheLegendOfZelda'':
76** ''VideoGame/TheLegendOfZeldaALinkToThePast'': Before he dies Link's uncle teaches the hero his signature Spin Attack which has been passed down their family.
77** In ''VideoGame/TheLegendOfZeldaTwilightPrincess'', Wolf Link can find a golden wolf spirit, which is actually an ancient warrior and is actually the Link from ''VideoGame/TheLegendOfZeldaOcarinaOfTime'', who teaches him various forgotten sword techniques which greatly boost his effectiveness.
78* Somewhat toyed with concerning the Early Summer Rain Jab in the last case of ''VisualNovel/AceAttorneyInvestigations''. [[spoiler:After Larry's blunder with the Samurai Spear, the studio puts a gag order on the incident and tries to pretend the move doesn't exist. Kay comments that it seems like a lost art because of that.]]
79* In ''VideoGame/TheLegendOfSpyro'' the Old Ways of dragon combat, particularly the [[LimitBreak Fury Wave attack]], fall under the almost lost/destroyed category. It's implied that only the Elder dragons can teach the techniques, and there just aren't many Elder dragons (or any other dragons for that matter) left due to a years-long war
80* ''VideoGame/{{Pokemon}}'':
81** Many Pokémon, mostly Legendaries, have an attack only that specific Pokémon (and its family, if it has one) can use under normal circumstances. Bulbapedia lists the article as "Signature Move", but it's not to be confused with the trope SignatureMove. In addition, Bulbapedia's article lists Pokémon who have moves that are exclusive to them but can be learned by other means such as Smart Strike for Rapidash and its Galarian form in ''VideoGame/PokemonSwordAndShield'' as the move can be taught by [=TM97=], species-specific moves which replace a certain move such as Kyurem's Fusion Bolt or Fusion Flare which replaces...Scary Face and one-off signature moves such as V-Create which is associated with Victini but in 2011, a Rayquaza that knew the move was distributed in Japan after the Sky High Pokémon won a popularity poll. However, in ''VideoGame/PokemonSwordAndShield'', V-Create is once again exclusive to Victini by way of being included as part of its level-up moveset.
82** Additionally, only the starter Pokémon can learn the elemental Pledge moves, and only their final forms can be taught the strongest Grass/Fire/Water moves (Frenzy Plant, Blast Burn, Hydro Cannon). Draco Meteor can only be taught to Dragon-types with a high enough friendship stat.
83** ''VideoGame/PokemonXAndY'' introduces Mega Evolution, which fits this trope for both Pokémon and trainers. It is a temporary boost in power only available to certain Pokémon, and then only if they are holding their species' specific Mega Stone (meaning they can't hold any other item), and their trainer has a Mega Ring to activate the transformation, which only a select few trainers have (including the PlayerCharacter, after reaching a certain point in the game).
84** ''VideoGame/PokemonSunAndMoon'' adds Z-Moves, which allow a Pokémon to perform a stronger-than-normal attack once per battle. Most Z-Moves aren't covered by this trope, as can be used by any Pokémon with a regular move of the same type, but some can only be used by certain Pokémon, such as [[SeriesMascot Pikachu]]'s Catastropika.
85** Enforced in the [[VideoGame/PokemonColosseum Orre]] [[VideoGame/PokemonXDGaleOfDarkness games]] with the various Shadow moves. As the moves run off of the Pokemon's Shadow power, they are immediately abandoned and replaced with more normal moves once the Pokemon is purified. Operating words: "more normal", since one of those moves is available to the user through purification and through no other method, like Lugia learning Deoxys' signature move Psycho Boost.
86* ''VideoGame/{{MUGEN}}'': Kung Fu Man, the "template" character that comes with the game engine, has the "Kung Fu Palm" attack as this, according to one of his winquotes:
87--> "Your moves are too predictable. You want to learn Kung Fu Palm? It's not for novices."
88* ''VideoGame/FireEmblemHeroes'' has a ton of units with exclusive sets of skills that cannot be inherited to other units. Alongside the Assist, Special, A, B and C skills that some units have exclusive to them, there are also Duo and Harmonized Heroes that have Duo and Harmonized Skills, respectively, that players can trigger at any point on their turn, with it not being able to trigger in certain gamemodes.
89* The ''VideoGame/Shrek2'' game gives each playable character an exclusive ability only they can use:
90** Shrek: Ogre Lifting - Shrek can pick up stunned enemies and specific objects and throw them.
91** Fiona: [[SloMo Stop Time]] - Fiona can slow down time for everything except herself.
92** Donkey: Burro Blast - Donkey launches a powerful kick that can knock enemies away and break locks.
93** Gingy: Cookie - Gingy throws a cookie that attracts enemies.
94** Lil' Red: Rotten Apple Bomb - Red throws an explosive apple that deals heavy damage to enemies when it explodes.
95** Puss in Boots: Tightrope Walking - Puss can walk on chains and tightropes too narrow for anyone else.
96** Big Bad Wolf: Huff 'N Puff - Wolf exhales a powerful gust of air capable of blowing enemies away, extinguishing fires and activating machinery.
97** Fairy: Fairy Dust - Fairy uses her magic to make allies and enemies alike float into the air.
98** Human Shrek & Stallion Donkey: Charge - Donkey rushes forwards as Shrek stabs his sword, which heavily damages enemies and breaks locks.
99* ''VideoGame/{{Miitopia}}'' has Horse Whispering/Horseplay, a special Horse Assist that can only be used by the player character when Autobattle is turned off. Beyond this, the assist functions differently depending on what class the user is.
100* ''Franchise/ShinMegamiTensei'' has a variety of moves that specific demons take as their {{Signature Move}}s, such as Alice's [[OneHitKill Die For Me]], [[Myth/NorseMythology Thor and Odin]]'s [[ShockAndAwe Thunder Reign]], and Matador's [[DeathOfAThousandCuts Andalucia]]. Many of these games let you pass these skills to new demons on via [[FusionDance Demon Fusion]], and ''VideoGame/ShinMegamiTenseiIV'' even lets [[PlayerCharacter you]] use these skills yourself through [[PowerCopying Demon Whisper]]. However ''VideoGame/ShinMegamiTenseiIVApocalypse'' puts the [[{{Nerf}} kibosh]] on these by disabling these sorts of skills from being passed on through either method.
101* ''VideoGame/{{Temtem}}'' has several techniques which can only be learned by one species or evolutionary line. They usually have more elaborate animations.
102** Starting in 0.7.2, the only technique Mimit learns is DNA Extraction, a weak, physical Digital attack that raises the user's speed.
103** Each of Chromeon's and Koish's forms have a unique attack called [corresponding type] Torrent/Stream, respectively.
104** Taifu has Leech, which drains 35% of the target's health. It costs less stamina when used with a Water ally.
105** Naigaise has Nagaise's Fury, a special Water technique that damages both opponents. It powers up when used with a Mental-type ally.
106** Babawa has Drool, which gives the target the immune status for four turns and GradualRegeneration for three turns.
107** Raize and Raican have King's Roar, which lowers the opposing team's speed and attack.
108** Saipat has Nicho Sai, a powerful physical Melee technique.
109** Tortenite has Tortenite's Garden, which heals the user and [[TimeDelayedDeath dooms]] an opponent. It restores more HP when used with a Crystal-type ally.
110** Seismunch has Seismunch's Wreck, a physical Earth technique which damages both opponents. It powers up when used with a Melee-type ally.
111** Noxolotl has Acid Reflux, a special Toxic-type attack that hits both opponents and poisons them for two turns.
112** Zephyruff and Volarend have Toxic Plume, a special Toxic technique that poisons both opponents. When used with a Crystal-type ally, it lowers their attack as well.
113** Oceara has Serbatiyo's Wrath, a special Water technique that damages both opponents and raises the user's special attack. It learns it through a Technique Course that is received after clearing Dabmis' Rest.
114** Yowlar has Winter Call, which inflicts the cold status condition on the targets.
115** Loatle has Penance, a Mental status technique that raises the user's attacking stats at the cost of [[CastFromHitPoints 10% of its HP.]]
116** Pigepic has Divine Inspiration, an Earth-type status technique that heals the user and its ally by 20% of their max HP and boosts their special defence. The description jokes that people worship Pigepic.
117** Akranox has Sting, a physical Toxic technique that poisons the target.
118** Waspeen has Swarm Aid, which exhausts both opponents and drains 10% of their health, which increases to 15% with an Earth ally.
119** Arachnyte has Cozy Net, which traps the target and makes it fall asleep for three turns.
120** Anahir and Anatan have Chains Hit, a physical Fire attack that deals damage to one target and [[AntiEscapeMechanism traps]] it for two turns.
121** Tyranak has Outgrowth, a physical Nature attack that hits both opponents, [[ManaBurn depletes 20% of their stamina]], and traps them for two turns.
122** Volgon has Ampere Outburst, which invigorates it for two turns and overexerts all other tems on the battlefield.
123[[/folder]]
124
125[[folder:Visual Novels]]
126* In ''VisualNovel/FateStayNight'', [[spoiler:Souichirou Kuzuki]] is a master at a secret assassination martial art only referred to as "Snake". The art focuses on using misdirection and hooked movements that are actually ''more'' effective the more well-trained the opponent is in traditional martial arts, as they rely on fooling the fighter's training and exploiting holes in their defenses. However, the art's real effectiveness is in the element of surprise and catching the victim off-guard: once a skilled fighter realizes the nature of the art, they can adjust to match it, and then the Snake practitioner is at a severe disadvantage.
127[[/folder]]
128
129[[folder:Web Comics]]
130* In ''Webcomic/TheOrderOfTheStick'', the [[AntiMagic Spellsplinter Maneuver]] is well-known enough amongst fighters and swordsmen that it can be recognized on sight, but the only person alive who knows how to execute the technique is [[spoiler: Roy Greenhilt, who learned the technique from his grandfather while he was spending time in the afterlife]].
131[[/folder]]
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133[[folder:Web Video]]
134* ''WebVideo/YuGiOhTheAbridgedSeries''' explanation for why nobody could summon Exodia until Yami did: "This game makes no sense and nobody could figure out how to do it!"
135[[/folder]]
136
137[[folder:Western Animation]]
138 * ''WesternAnimation/AvatarTheLastAirbender'': In need of gaining firebending Aang and Zuko travel to the city of the first firebenders and discover ancient dragons who teach them an ancient form of firebending (or at least the philosophical underpinnings of it; fire as life and energy, rather than simply rage and destruction). There are also some more specialized examples:
139** Lightning-bending, the ability of a few high-end Firebenders to, well, blast people with lightning. In the original series, only Ozai and [[spoiler:his daughter Azula]] know how to do this; by the time of [[WesternAnimation/TheLegendOfKorra the sequel series]], the ability appears to be commonplace. Iroh develops his own counter to this: a lightning-''redirecting'' ability, which he teaches to Zuko, who later teaches it to Aang.
140** Chi-Blocking, a pressure-points sort of technique that temporarily disables your opponent's bending powers. Only Ty Lee can do this at first; but, since it doesn't require [[SuperpowerfulGenetics inherited magicalness]], this skill is also relatively common in the sequel, making it much more feasible for non-benders to fight benders.
141** Bloodbending, an [[TheDarkArts evil version]] of Waterbending that allows you to control your opponent's body--making them helpless, since all the magic powers in their world are SupernaturalMartialArts. It was invented by an imprisoned waterbender who had nothing available to bend but the blood of her captors. Katara learns it from her, but [[DangerousForbiddenTechnique is reluctant to use it]]. This one is still rare in the sequel, but nonetheless important, since [[spoiler:Amon combines it with Chi-Blocking to ''permanently'' disable people's bending.]]
142[[/folder]]
143
144[[folder:Real Life]]
145* Martial Arts: Many forms, such as Ninjitsu, were traditionally taught in secret by a very few masters. The fact that they were explicitly forbidden and/or illegal forced them to remain underground. Sometimes prospective students were bound by an oath of silence, especially when this was a weapon of [[LaResistance rebels]]. These days, though, secret techniques don't remain secret for very long.
146** Some techniques were developed by particular martial artists, who died without passing them on. But those arts are not so much Secret as they are Forgotten.
147** [[Literature/{{Blossfechten}} Liechtenauer's school of German swordsmanship.]] In its time it was very exclusive, and it became entirely lost at some point in the 18th century. It's been brought back from the dead thanks to the finding of a handful of Medieval and Renaissance combat manuals, but it remains highly obscure.
148*** In particular, the five ''Meisterhau'' or Master-hews in said style, originally known as the "Secret-hews" of said style. They were designed to regain the initiative in a fight by attacking and defending in one motion. Obviously, they would later become much more widely known and drop the original "Secret" name.
149* In Vajrayana Buddhism and presumably many other religions, certain teachings are only passed down from master to student.
150** One of the major draws of esoteric traditions (including esoteric sects in mainstream religions) is the assumption that they are unknown because most PunyHumans can't handle them.
151* In the old days it was stage magic. In the 1800s, it was much harder to learn how to do magic even if would-be magicians were serious about learning because other magicians were so reluctant to teach newbies back then. Nowadays, there are hundreds of books available for learning the art--but even today it's still frowned upon by most magicians to reveal a secret to a layperson. Also, if one wishes to join a group such as the The Magic Castle or The Magic Circle, one usually has to prove that they're at least somewhat competent with magic by demonstrating decent ability and take an oath swearing that they will never reveal magic secrets to anyone not serious about learning the art--failure to follow this oath can get you [[SeriousBusiness banned]] from most groups.
152* Historically, trade secrets were just that-secrets of a given profession. Since professions were then generally controlled by their guilds, requiring membership for licensing to practice, this required only teaching approved people they apprenticed. Some economic historians have argued this seriously impeded development, since it kept information tightly guarded instead of shared. Trade secrets still exist however, and retain their legal protection, but it's no longer just the specific skills of a profession, but more specific intellectual property.
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