History Main / DangerousForbiddenTechnique

2nd Jul '16 12:04:28 AM superkeijikun
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** ''Anime/DragonBallSuper'' gives us Goku's "Super Saiyan God Super Saiyan Kaio-Ken", where he uses Kaio-Ken while in his Super Saiyan God Super Saiyan form. It provides a ''massive'' boost to Goku's power, but has a scant 10% success rate and can potentially kill Goku instantly the other 90% of the time. The technique also leaves Goku weakened, in pain, and unable to effectively use his ki afterwards.
24th Jun '16 9:52:25 PM billybobfred
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* In ''VideoGame/TheWorldEndsWithYou'', Joshua uses his [[spoiler:[[BeamSpam Jesus Beam]] attacks to get himself and Neku out of a battle with a Taboo Noise. Though not dangerous in itself, he held back this power until this moment to conceal his identity as the [[{{God}} Composer]], and used this power in the sight of a Reaper, thereby drawing suspicion to himself.]]
** [[spoiler:Hanekoma]] later proceeds to [[spoiler:revive Minamimoto as a Taboo Noise]] He reveals this himself to the player in the [[spoiler:[[UnreliableNarrator secret reports]]]]

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* In ''VideoGame/TheWorldEndsWithYou'', ''VideoGame/TheWorldEndsWithYou'':
**
Joshua uses his [[spoiler:[[BeamSpam Jesus Beam]] attacks to get himself and Neku out of a battle with a Taboo Noise. Though not dangerous in itself, he held back this power until this moment to conceal his identity as the [[{{God}} Composer]], and used this power in the sight of a Reaper, thereby drawing suspicion to himself.]]
** Late in the story, Kitaniji orders all the Reapers to wear special "O-Pins", which Uzuki gleefully describes as granting "unchained power". Kariya points out that there's probably a good reason the chains are normally kept on. [[spoiler:Subverted; as Konishi managed to figure out, Kitaniji ''lied'' about what they do. There's no power boost at all, they're just part of his AssimilationPlot.]]
** [[spoiler:Hanekoma]] later proceeds to [[spoiler:revive Minamimoto as a Taboo Noise]] He reveals this himself to the player in the [[spoiler:[[UnreliableNarrator secret reports]]]]reports]]]].
10th Jun '16 2:57:33 AM Vir
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* In the ''Franchise/MonsterHigh'' franchise, Frankie weaponizing her body's electricity by swapping the bolts on her neck is shown to be this, as when she does it on her grandfather's rampaging robot she consequently suffers a HeroicRROD. She gets better through ThePowerOfLove.

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* In the ''Franchise/MonsterHigh'' franchise, Frankie weaponizing her body's electricity by swapping the bolts on her neck is shown to be this, as when she does it on her grandfather's rampaging robot she consequently suffers a HeroicRROD. HeroicRROD She gets better through ThePowerOfLove.
6th Jun '16 10:31:53 PM GoldenSeals
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There are [[TheDarkArts some attacks]] in the media that come at a price. Actually, there are a ''lot'' of attacks in media that [[PowerAtAPrice come at a price.]]

Perhaps the technique exacts a horrible toll on the person's [[CastFromHitPoints body]]. Perhaps it's horribly [[BadPowersBadPeople immoral]] or [[WithGreatPowerComesGreatInsanity damaging to the mind]]. Perhaps it [[SummonBiggerFish calls up monsters that can't easily be controlled]].

Whatever the case, the character's mentor will tell him that he can only use said attack a set number of times or he's never supposed to use it unless some requirement is met. Expect the OldMaster to inform the hero that YouAreNotReady. And [[RuleOfDrama naturally]], a situation ''will'' come up where the character has no choice but to use the technique, or if it has a limited number of times it can be used safely, he or she will be forced to use it more than the safe number of times. Like ForbiddenChekhovsGun, this technique (or rather, its overuse) comes at a ''heavy'' price. Unlike ForbiddenChekhovsGun, the price is [[NecessaryDrawback nearly always paid]].

If the hero is ''lucky'', it could just be a HeroicRROD. But it's often worse than that. Sometimes it unleashes their SuperPoweredEvilSide.

Compare DeadlyUpgrade, CastFromHitPoints, CastFromLifespan, CastFromExperiencePoints, SacrificialRevivalSpell, DeathOrGloryAttack. If they constantly survive these it's a case of IThoughtItWasForbidden. See also GodzillaThreshold and LethalHarmlessPowers.

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There are [[TheDarkArts some attacks]] PowerAtAPrice embodied in the media a single move or technique, a Dangerous Forbidden Technique is an attack that come at carries a price. Actually, there are a ''lot'' significant risk of attacks in media that [[PowerAtAPrice come at harm to it. Maybe it takes a price.]]

Perhaps the technique exacts a horrible
toll on the person's [[CastFromHitPoints body]]. Perhaps it's horribly [[BadPowersBadPeople immoral]] the user's body]] or [[WithGreatPowerComesGreatInsanity damaging to the his mind]]. Perhaps Maybe it [[SummonBiggerFish calls up monsters summons monsters]] that can't easily be controlled]].

are hard to control. Maybe it's just [[BadPowersBadPeople immoral]], or it unlocks a SuperpoweredEvilSide. Whatever the case, reason, it can't be used unless it's absolutely necessary -- usually when the character's mentor will tell him that he can only use said attack a set number of times or he's never supposed GodzillaThreshold is reached.

A common way
to use it unless some requirement this trope is met. Expect the for an OldMaster to inform teach the technique but insist that the hero [[YouAreNotReady isn't ready to use it yet]]. RuleOfDrama indicates that YouAreNotReady. And [[RuleOfDrama naturally]], a situation ''will'' come up where the character hero must keep the technique in his back pocket until such time as he has no choice but to use the technique, or if it has it. It's like a limited number of times it can be used safely, he or she will be forced to use it more than the safe number of times. Like ForbiddenChekhovsGun, this technique (or rather, its overuse) comes at a ''heavy'' price. Unlike ForbiddenChekhovsGun, the price is [[NecessaryDrawback nearly always paid]].

If the hero is ''lucky'',
except it could just be has a HeroicRROD. But it's often worse than that. Sometimes it unleashes their SuperPoweredEvilSide.

NecessaryDrawback.

Compare DeadlyUpgrade, CastFromHitPoints, CastFromLifespan, CastFromExperiencePoints, SacrificialRevivalSpell, and DeathOrGloryAttack. If they constantly survive these it's a case of IThoughtItWasForbidden. See also GodzillaThreshold and LethalHarmlessPowers.
LethalHarmlessPowers. If a character uses (and survives) the move on a regular basis, it's IThoughtItWasForbidden.



* ''Manga/{{Naruto}}'' has many of these. In fact, there exists a specific subset of the Shinobi arts called 'Kinjutsu', literally "Forbidden Techniques". For one reason or another they have been banned from being taught, used, or both by the commanding shinobi. They are either jutsu that damage the user to a fatal extent (e.g. Mass Shadow Clone Technique: Each Shadowclone takes a portion of the shinobi's chakra for himself/herself. Make too many Shadow Clones, and the original will probably die from exhaustion), jutsu that are viewed as ethically wrong (such as Edo Tensei which resurrects the dead) or jutsu which involve other crimes (e.g. murder in case of the "Edo Tensei," because a HumanSacrifice is needed to resurrect someone). There also exists a wide range of techniques that are not officially 'kinjutsu', but fit this trope.
** Sasuke's Chidori is only supposed to be used twice, but he uses it a third time; the result is that his cursed seal activates and nearly takes over (the technique later loses its "Dangerous" element, as Sasuke is able to spam the crap out of it without becoming exhausted). Just about every move Rock Lee uses that isn't a basic punch or kick carries some heavy toll on his body (such as his use of the Chakra Gates), and as a result, Gai forces prerequisites upon him, so that he must be protecting someone or defending his ninja way when he uses said moves.
*** Sasuke gained the ability to use the Chidori more often by the growth of his chakra capacity. Kakashi has likewise increased the number of times he can use his own forbidden techniques, Raikiri (an enhanced Chidori) and Kamui (which [[OneHitKill sucks anything he looks at into another dimension]]). As Kakashi explained to Sasuke, when dealing with chakra-heavy jutsu it's essential for a ninja to know their limit. Attempting to exceed that limit will most likely cause the jutsu to fizzle, and the user will suffer potentially lethal chakra exhaustion. Thus, when Sasuke tried to use that third Chidori in a single day, if he didn't have the cursed seal it probably would've resulted in a SenselessSacrifice.
** In the second half of the manga, Naruto gains his Futon: Rasenshuriken, which is so powerful it actually causes widespread cellular damage in the arm he executes it with, which is far too minute for healing jutsus to repair. While Naruto's HealingFactor can still repair the damage on its own, having to heal from something that extensive still reduces his lifespan. Tsunade even tells him not to use it again. After mastering [[SuperMode Sage Mode]], he perfects it so he can throw it, thus nullifying the risk to himself.
** Lady Chiyo's clan dabbles with using chakra "strings" to control life-size puppets (and in some cases, assist a human by adding their reflexes to the subject's); they began work on a jutsu to truly breathe life into puppets, but stopped when the beta technique had a nasty side-effect of (you guessed it!) killing the user of the jutsu. [[spoiler:Chiyo winds up [[HeroicSacrifice using it]] to save Kazekage Gaara (yes, the same Gaara that houses a demon, not unlike the titular Naruto).]]
** Hell, the deeper level of his Kyuubi form actually shortens his lifespan too, as it involves repeatedly burning away and healing back Naruto's skin. That's without considering the whole SuperPoweredEvilSide transformation. [[spoiler:Eventually, Naruto befriends the Kyuubi, allowing him to access its full power without physically transforming and thus without any risks involved.]]
*** As does Tsunade's own regeneration jutsu, which is consequently only used when there's a danger of a much more drastic shortening of her lifespan.
** Pain has been shown to have [[spoiler:an ''[[WaveMotionGun incredibly]]'' powerful version of his gravity attack that takes off years of his life, but can ''destroy an entire city in one blast''. And he uses it.]]
*** However, Nagato is [[spoiler: an Uzumaki, which means he has his clan's longevity]], reducing the risk of Shinra Tensei's big version.
** The Dead Demon Sealing Technique summons the fricking Grim Reaper to [[YourSoulIsMine tear out your opponent's soul]], [[TakingYouWithMe and your own]], and then forces them to fight forever in its stomach.
** The recently revealed [[spoiler: Izanagi]] allows users to cast genjutsu on ''themselves'' that can briefly override reality. As a tradeoff, [[spoiler: the eyes used to cast the genjutsu will close forever]].
** Finally, there is Edo Tensei, a jutsu that sacrifices a living person to bring another back from the dead as a zombie with unlimited regenerative abilities. It is forbidden both because of being necromancy that's fueled by HumanSacrifice and because it is extremely effective - the undead not only regenerate from ashes as long as their soul is in place, allowing them to reuse their own dangerous forbidden techniques with impunity, but since the chakra reserve is tied to physical stamina, the regeneration also keeps replenishing their energy. When it is used to its full potential by [[spoiler: Kabuto]], the resulting BossRush takes thousands of ninjas to stop.
*** The risk of Edo Tensei is [[spoiler: if an exceptionally powerful Edo Tensei, like Madara, knows the contract, they can break it. Thus even if the summoner cancels the technique, the Tensei would continue to exist...now free of the control.]]
** Quoted above is the Eight Inner Gates, a technique that grants exponentially greater amounts of strength each time one is opened, but with more and more strain on the user's body. If all eight are opened, the user becomes physically stronger than any human could otherwise manage. For a few minutes. [[DeadlyUpgrade Then you drop dead on the spot.]] Rock Lee, before the timeskip, was almost permanently crippled by using 5 gates and having his arm and leg crushed by Gaara. Might Guy, Lee's teacher, is stronger and more able to use it, but it's indicated that if he opens the eighth gate, death is guaranteed even for him.
*** A character is ultimately shown using all eight gates, and the resulting physical prowess not only surpasses that of all the characters known when the technique was first introduced, it surpasses that of even [[spoiler:[[PhysicalGod Madara Uchiha, who was hosting the Juubi to boot]]]]. After his final attack, his body is so overheated it starts dissolving into ash while he's still alive. [[spoiler: Naruto is able to prevent this, but Guy is shown to be in a wheelchair years later.]]
** Before any of these was what became Naruto's signature technique: the Tajū Kage Bunshin no Jutsu, or "Multiple Shadow Clone Technique." Multiple being somewhat of an understatement: the average ninja who was any good could make two or three shadow clones, a skilled chakra user with a strong reserve could make maybe a dozen simultaneously. The Tajū Kage Bunshin no Jutsu creates, on average, several ''hundred'' clones. It wasn't forbidden because of the power of the clones (they were still subject to the normal rules of shadow clones) but because a single usage was so draining it would instantly kill anyone who didn't have a superhuman chakra reserve, a Tailed Beast [[SealedEvilInACan sealed inside them]], or in Naruto's case, both.
* The title character from ''Manga/{{Inuyasha}}'' can allow his demonic blood to temporarily dominate him by casting aside his mystical {{BFS}}, or having it stolen, which means it borders between this trope and SuperpoweredEvilSide. This "demon form" makes him a lot stronger but the more times he uses it, the more [[DeadlyUpgrade his soul decays]]. This may not sound like much, but what it actually means is that he becomes a [[UnstoppableRage berserk, vicious killer]], and the more time he spends in this form, the more indiscriminate he becomes in choice of targets. It also becomes easier and easier to activate, and harder and harder to turn off... which means that he will, ultimately, become nothing but a mindless killing machine that can do nothing but wander aimlessly and slaughter everything in sight.
* ''Manga/RurouniKenshin'' used this trope on both Shishio and Kenshin. [[spoiler: The full body-bandaged Shishio would and did die from heat exhaustion after 15 minutes. Kenshin was forced to retire from swordmanship for good because of his overuse of the Hiten Mitsurugi Ryuu, as his fighting style is meant for more muscular men.]]
** Hiten Mitsurugi Ryuu also has an ultimate technique that involves putting yourself in significant danger. If you hesitate even the slightest amount, you either die or lose your leg. If you don't hesitate, you might still lose your leg.
** Sanosuke's [[MegatonPunch Futae No Kiwami]] becomes one over time due to its overuse. His hand injury was said to be even worse than the damage Kenshin suffered against Shishio. Though his hand never really heals, he finds ways to minimize damage.
* ''Anime/DragonBallZ''
** Goku was taught the Kaio-Ken by King Kai, but was told not to use it at more than double capacity. When he fought Vegeta, he had to use it at triple capacity, which hurt like hell, and then ''quadruple'' during the BeamOWar - after that, Yajirobe just patting him on the back made him scream in agony. By the time he fought Frieza, he could use the lower levels without any strain (King Kai had to tell the others that he'd been using it the whole time and wasn't holding back). He eventually used it ''multiplied by twenty'' -- the maximum, and still nowhere near enough to win. ''That'' wiped out his reserves and left him nearly defenseless. The reason why Goku was able to withstand all of this is because of a Saiyan racial ability that allows him to become stronger through surviving near fatal encounters. [[spoiler:It makes a grand comeback in ''Anime/DragonBallSuper'', where the traits of Super Saiyan Blue[[note]]AKA Super Saiyan God Super Saiyan[[/note]] allow Goku to combine the two techniques into a Super Kaio-Ken. However, even that is this trope to an ''even great extent'' - the thing only lasts a few minutes, has a 90% failure rate and, if performed wrong, ''could kill Goku''. A later episode revealed that it gave him temporary Delayed Onset Ki Syndrome, which messed with how he manipulated ki.]]
** He was also warned about the power of the Spirit Bomb before returning to Earth, since the technique can destroy planets if misused.
** Another character, Tien, also had a forbidden technique: his Kikoho (Tri-Beam in the dub) will kill him if he uses it too much. Even when it doesn't kill him, it still exhausts him to the point of not being able to fight.
** There's also the Mafuba (Evil Containment Wave in the dub), the technique that Master Mutaito used to seal King Piccolo. The attack requires so much energy that it kills the user, as Master Mutaito died from using, and later on in the series, Master Roshi dies after unsuccessfully using it against the now-released King Piccolo. [[spoiler: Tien survives trying to use it... but mostly because of its failure ''and'' because, unlike Mutaito and Roshi, he's a young man instead of an OldMaster. He's still left completely defenseless and drained, and if not for Goku's BigDamnHeroes, he would've been easily killed by his enemy.]]
** Vegeta's "Ultimate Final Skill" (suicide explosion, in games it's called Final Explosion, which reduces you to a single pixel of life). Of course, [[SenselessSacrifice it doesn't work on Buu]].
* In ''Manga/{{Eyeshield 21}}'', Hiruma orders Sena to seal the "Devil Bat Ghost" technique. At first he believes this is to stop competition from seeing it, unless it is coming at them. But when he later breaks these orders, he discovers that because he is yet to master the technique fully, it puts tremendous strain on his knees, and repeated use could injure him.
** The Devil Bat Dive is a lesser-used example, and for good reason. Using their try-for-point for a consecutive touchdown, the Devil Bat Dive requires him leaping over both lines, spinning, and falling into the end zone. Such a maneuver is dangerous in both fiction AND real life, which is why most teams just go for the kick less one of their players gets thrown into the ground head first.

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* ''Manga/{{Naruto}}'' has many of these. In fact, there exists a specific these.
** A
subset of the Shinobi arts are called 'Kinjutsu', the ''Kinjutsu'' -- literally "Forbidden Techniques". "forbidden techniques". For one reason or another another, they have been banned from being taught, used, cannot be taught or both used by the commanding shinobi. They are either jutsu that damage Some fatally harm the user to a fatal extent (e.g. user, like the Mass Shadow Clone Technique: Each Shadowclone takes a portion Technique, which launches {{Doppelganger}}s who [[CastFromHitPoints take some of the shinobi's user's chakra]], which is eventually fatal; a version of this is Naruto's SignatureMove, although Naruto has a superhuman chakra for himself/herself. Make too many Shadow Clones, and the original will probably die from exhaustion), jutsu reserve ''and'' a SuperpoweredEvilSide that can handle it. Others are viewed as ethically wrong (such as considered unethical, like the Edo Tensei Tensei, which [[RiseFromYourGrave resurrects the dead) or jutsu dead]] at the cost of another HumanSacrifice. Edo Tensei is particularly powerful (effectively giving you a NighInvulnerable army of TheUndead), which involve other crimes (e.g. murder in case of increases the "Edo Tensei," because a HumanSacrifice is needed temptation to resurrect someone). There also exists a wide range of techniques use it, only for the user to find that are not officially 'kinjutsu', but fit this trope.
at its most powerful, [[spoiler:its creations might escape from the user's control]].
** Sasuke's Chidori is only supposed to be used twice, but he uses it a twice. The third time; the result is that his time he used it, he would have died if he didn't have a cursed seal activates and deal which nearly takes over (the technique later loses its "Dangerous" element, as Sasuke is able [[GrandTheftMe took him over]]. Since then, he increased his own chakra capacity to the point that he can spam the crap out of it without becoming exhausted). Just about every move Rock Lee uses that isn't a basic punch or kick carries some heavy toll on his body (such as his use of the Chakra Gates), and as a result, Gai forces prerequisites upon him, so that he must be protecting someone or defending his ninja way when he uses said moves.
*** Sasuke gained the ability to use the Chidori more often by the growth of his chakra capacity.
any ill effects.
**
Kakashi has likewise increased the number of times he can use his own had two forbidden techniques, Raikiri (an techniques: Raikiri, an enhanced Chidori) Chidori; and Kamui (which Kamui, which [[OneHitKill sucks anything he looks at into another dimension]]). As Kakashi explained to Sasuke, when dealing with chakra-heavy jutsu it's essential for a ninja to know their limit. Attempting to exceed that limit will most likely cause the jutsu to fizzle, and the user will suffer potentially lethal dimension]]. Both are limited by chakra exhaustion. Thus, when capacity. He figured out how to increase his chakra capacity (and taught Sasuke tried to use that third Chidori how as well).
** Naruto gets his Futon, Rasenshuriken,
in a single day, if he didn't have the cursed seal it probably would've resulted in a SenselessSacrifice.
** In
the second half of the manga, Naruto gains his Futon: Rasenshuriken, which is manga. It's so powerful that it actually causes widespread cellular damage in to the arm he executes it with, which with. The damage is far too minute for microscopic, so healing jutsus to repair. While can't repair it, and Naruto's own HealingFactor can still repair the damage on its own, having to heal from something is so overworked that extensive still it [[CastFromLifespan reduces his lifespan. lifespan]]. Tsunade even tells him not to use it again. After mastering Then he masters his [[SuperMode Sage Mode]], he Mode]] and perfects it so to the point that he can throw it, thus nullifying it and nullify the risk to himself.
** Lady Chiyo's clan dabbles with using chakra "strings" to control life-size puppets (and in some cases, assist Naruto's Kyuubi is essentially a human by adding their reflexes to the subject's); they began work on a jutsu to truly breathe life into puppets, but stopped when the beta technique had a nasty side-effect of (you guessed it!) killing the user of the jutsu. [[spoiler:Chiyo SuperPoweredEvilSide; at deeper levels, it also shortens his lifespan. Naruto winds up [[HeroicSacrifice using it]] to save Kazekage Gaara (yes, [[spoiler:befriending the same Gaara that houses a demon, not unlike the titular Naruto).Kyuubi, which allows him access to its full power without having to physically transform.]]
** Hell, the deeper level of his Kyuubi form actually Tsunade's regeneration jutsu [[CastFromLifespan shortens his lifespan too, her lifespan]] as it involves repeatedly burning away and healing back Naruto's skin. That's without considering well.
** Lady Chiyo's clan dabbles with using chakra "strings" to control life-size puppets (and in some cases, assist a human by adding their reflexes to
the whole SuperPoweredEvilSide transformation. [[spoiler:Eventually, Naruto befriends subject's). They began work on a jutsu to truly breathe life into puppets, but stopped when the Kyuubi, allowing him beta technique had a nasty side-effect of (you guessed it!) killing the user. [[spoiler:Chiyo winds up [[HeroicSacrifice using it]] to access its full power without physically transforming and thus without any risks involved.save Kazekage Gaara.]]
*** As does Tsunade's own regeneration jutsu, which is consequently only used when there's a danger of a much more drastic shortening of her lifespan.
** Pain has been shown to have [[spoiler:an ''[[WaveMotionGun incredibly]]'' powerful version of his gravity attack that takes off years of his life, but can ''destroy destroy an entire city in one blast''.blast. And he uses it.]]
*** However, Nagato
]] Nagato, on the other hand, is [[spoiler: an [[spoiler:an Uzumaki, which means he has his clan's longevity]], reducing the risk of Shinra Tensei's big version.
so he can use it with reduced risk.
** The Dead Demon Sealing Technique summons the fricking Grim Reaper to TheGrimReaper, who takes [[YourSoulIsMine tear out both your opponent's soul]], soul]] and [[TakingYouWithMe and your own]], opponent's]] and then forces them to fight forever in its stomach.
** The recently revealed [[spoiler: Izanagi]] allows users to cast genjutsu on ''themselves'' that can briefly override reality. As a tradeoff, [[spoiler: the eyes used to cast the genjutsu will close forever]].
** Finally, there The Eight Inner Gates (as referenced in the page quote) is Edo Tensei, a jutsu technique that sacrifices a living person to bring another back from grants exponentially greater strength as each gate is opened, but with increasing strain on the user's body; Rock Lee was almost permanently crippled by using five of them. If all eight are opened, the user becomes physically stronger than any human could be for a few minutes. [[DeadlyUpgrade Then he drops dead as a zombie with unlimited regenerative abilities. It is forbidden both because of being necromancy that's fueled by HumanSacrifice and because it is extremely effective - on the undead not only regenerate from ashes as long as their soul is in place, allowing them to reuse their own dangerous forbidden techniques with impunity, but since the chakra reserve is tied to physical stamina, the regeneration also keeps replenishing their energy. When it is used to its full potential by [[spoiler: Kabuto]], the resulting BossRush takes thousands of ninjas to stop.
***
spot]]. The risk of Edo Tensei is [[spoiler: if an exceptionally one character who uses all eight gates becomes more powerful Edo Tensei, like Madara, knows the contract, they can break it. Thus than even if [[spoiler:[[PhysicalGod Madara Uchiha, who was hosting the summoner cancels Juubi to boot]]]], after which his body is so overheated that it starts dissolving into ash while he's still alive. [[spoiler:Naruto stops him from dying, but the technique, the Tensei would continue to exist...now free of the control.character is shown in a wheelchair years later.]]
** Quoted above is the Eight Inner Gates, a technique that grants exponentially greater amounts of strength each time one is opened, but with more and more strain on the user's body. If all eight are opened, the user becomes physically stronger than any human could otherwise manage. For a few minutes. [[DeadlyUpgrade Then you drop dead on the spot.]] Rock Lee, before the timeskip, was almost permanently crippled by using 5 gates and having his arm and leg crushed by Gaara. Might Guy, Lee's teacher, is stronger and more able to use it, but it's indicated that if he opens the eighth gate, death is guaranteed even for him.
*** A character is ultimately shown using all eight gates, and the resulting physical prowess not only surpasses that of all the characters known when the technique was first introduced, it surpasses that of even [[spoiler:[[PhysicalGod Madara Uchiha, who was hosting the Juubi to boot]]]]. After his final attack, his body is so overheated it starts dissolving into ash while he's still alive. [[spoiler: Naruto is able to prevent this, but Guy is shown to be in a wheelchair years later.]]
** Before any of these was what became Naruto's signature technique: the Tajū Kage Bunshin no Jutsu, or "Multiple Shadow Clone Technique." Multiple being somewhat of an understatement: the average ninja who was any good could make two or three shadow clones, a skilled chakra user with a strong reserve could make maybe a dozen simultaneously. The Tajū Kage Bunshin no Jutsu creates, on average, several ''hundred'' clones. It wasn't forbidden because of the power of the clones (they were still subject to the normal rules of shadow clones) but because a single usage was so draining it would instantly kill anyone who didn't have a superhuman chakra reserve, a Tailed Beast [[SealedEvilInACan sealed inside them]], or in Naruto's case, both.
* The title character from ''Manga/{{Inuyasha}}'' can allow his demonic blood to temporarily dominate him by casting aside his mystical {{BFS}}, or {{BFS}} (or having it stolen, which means it borders between this trope and stolen); it's a form of SuperpoweredEvilSide. This "demon form" makes him a lot stronger stronger, but the more times he uses it, the more his [[DeadlyUpgrade his soul decays]]. This may not sound like much, but what it actually means is that decays]] with each use, and he becomes a [[UnstoppableRage berserk, vicious killer]], more bloodthirsty, vicious, and indiscriminate]] the more time he spends in this form, the more indiscriminate he becomes in choice of targets. his demon side takes over. It also becomes easier and easier to activate, and harder and activate (but harder to turn off... which means off) over time, implying that he will, ultimately, become nothing but a mindless killing machine that can do nothing but wander aimlessly and slaughter everything in sight.
his demon side will eventually take over completely.
* ''Manga/RurouniKenshin'' used this trope on both Shishio and Kenshin. [[spoiler: The full body-bandaged Shishio would and did die from heat exhaustion after 15 minutes. ''Manga/RurouniKenshin'':
**
Kenshin was forced to retire from swordmanship for good because of his overuse of the Hiten Mitsurugi Ryuu, as his fighting style is meant for more muscular men.]]
**
style, Hiten Mitsurugi Ryuu also Misturugi Ryuu, has an ultimate technique that involves putting yourself the user in significant danger. If you hesitate for even the slightest amount, a moment, you either die or lose your leg. If you don't hesitate, you might still lose your leg.
leg. But overall, the style as a whole takes its toll on Kenshin, who [[spoiler:winds up having to retire from swordsmanship for good]]. Shishio used this technique as well, and [[spoiler:as he was in a full-body bandage, he died of heat exhaustion after 15 minutes]].
** Sanosuke's [[MegatonPunch Futae No Kiwami]] becomes one over time due to its overuse. His hand injury was said to be even worse than the damage Kenshin suffered against Shishio. Though his hand never really heals, he finds ways to minimize the damage.
* ''Anime/DragonBallZ''
''Anime/DragonBallZ'':
** Goku was taught first learned the Kaio-Ken by from King Kai, but was who told him not to use it at more than double capacity. When he fought Vegeta, he had Vegeta proved to use be the GodzillaThreshold where Goku used it at triple capacity, which hurt like hell, and then ''quadruple'' during the BeamOWar - after BeamOWar. After that, Yajirobe made him scream in agony just by patting him on the back made him scream in agony. back. By the time he fought Frieza, he was strong enough that he could use the lower levels without any strain (King Kai strain, but Frieza was strong enough that he had to tell the others that he'd been using multiply it the whole time and wasn't holding back). He eventually used it ''multiplied by twenty'' ''twenty'' -- the maximum, and still nowhere near maximum. Not only was it not nearly enough to win. ''That'' wiped out his reserves and win, it also left him nearly exhausted and defenseless. The reason why Thankfully, Goku was able to withstand all of this is because of a has the Saiyan racial ability that allows him to become stronger through after surviving near fatal near-fatal encounters. [[spoiler:It The Kaio-Ken makes a grand comeback in ''Anime/DragonBallSuper'', [[spoiler:''Anime/DragonBallSuper'', where the traits of he combines it with Super Saiyan Blue[[note]]AKA Blue (or Super Saiyan God Super Saiyan[[/note]] allow Goku to combine the two techniques into a Super Kaio-Ken. However, even that is God)]]; this trope to an ''even great extent'' - the thing version only lasts a few minutes, has a 90% failure rate and, rate, and could be fatal if performed wrong, ''could kill Goku''. A later episode revealed that incorrectly, but ''damn'' is it gave him powerful. It also [[spoiler:gave Goku temporary Delayed "Delayed Onset Ki Syndrome, Syndrome", which messed with how he manipulated his ability to manipulate ki.]]
** He was also warned about the power of The other technique King Kai taught Goku, the Spirit Bomb before returning Bomb, is powerful enough to Earth, since the destroy planets. King Kai had to tell him to use it sparingly.
** Tien's forbidden
technique can destroy planets if misused.
** Another character, Tien, also had a forbidden technique: his
is the Kikoho (Tri-Beam in the dub) dub), which will kill him if he uses it too much. Even when it doesn't kill him, it still exhausts with overuse or otherwise exhaust him to the point of not being able unable to fight.
** There's also the The Mafuba (Evil Containment Wave in the dub), dub) is the technique that Master Mutaito used to seal King Piccolo. The attack It requires so much energy that it kills the user, as it did to Master Mutaito died from using, and later on in the series, Mutaito; when Piccolo comes back, Master Roshi dies after tries it unsuccessfully using it against the now-released King Piccolo. [[spoiler: and dies as well. It turns out [[spoiler:age may have been a factor; Tien survives survived trying to use it... but mostly because of its failure ''and'' because, unlike Mutaito and Roshi, he's a young man instead of an OldMaster. He's it, although it still left him completely defenseless and drained, and if not for Goku's BigDamnHeroes, he would've been easily killed by his enemy.defenseless.]]
** Vegeta's Vegeta has an "Ultimate Final Skill" (suicide explosion, in games it's called Final Explosion, which reduces you to Skill", effectively a single pixel of life). Of SuicideAttack. (Of course, [[SenselessSacrifice it doesn't work on Buu]].
*
Buu]].) In the games, it's called "Final Explosion" and reduces you to [[HPToOne a single hit point]].
*
''Manga/{{Eyeshield 21}}'', 21}}'':
** The "Devil Bat Ghost" technique causes tremendous strain on the user's knees.
Hiruma orders Sena to seal the "Devil Bat Ghost" technique. At first he believes this is technique from view; Sena originally thinks it's to stop the competition from seeing it, unless it is coming at them. But when until he later breaks these orders, he discovers that because he is yet to master the order and finds out firsthand.
** The "Devil Bat Dive" is a rarely-used two-point conversion
technique fully, it puts tremendous strain on his knees, and repeated use could injure him.
** The Devil Bat Dive is a lesser-used example, and for good reason. Using their try-for-point for a consecutive touchdown, the Devil Bat Dive
that requires him leaping the runner to leap over both lines, spinning, spin, and falling fall into the end zone. Such a maneuver is dangerous in both fiction AND real life, which is why most zone, carrying significant risk of injury. Most teams don't bother and just go kick the extra point. It's rarely used in [[UsefulNotes/AmericanFootball real life]] for the kick less one of their players gets thrown into the ground head first.same reason.



** In general, ''any'' ability gained by Devil Fruit may be considered this. Some abilities can give the user amazing powers (some are more useful than others) but it always comes with a potentially lethal side-effect, especially considering that this is an OceanPunk series: the user permanently loses the ability to swim. Pirates who take a chance and use the stuff are truly risking their lives, especially those who brave the dangers of the Grand Line.
** Trafalgar Law's Devil Fruit, the Op-Op Fruit, deserves special mention for having one of these built in: the user, if (s)he so chooses, can perform the "Immortality Operation" on one person, which grants that person eternal youth. However, doing so will cost the user his/her own life.
** Hero Water (Fatal Elixer) in the Alabasta arc. Drinking it massively magnifies all of your physical attributes for five minutes. Then you die.
** During the Skypiea arc, a device is introduced called the Impact Dial, which absorbs any force that strikes it and then deals it back when the button is pressed, though it seems to cause a great deal of pain to the user's arm. Also introduced is its extremely rare counterpart: the Reject Dial, which deals back the force absorbed multiplied by ten. Using that has a large chance of destroying the user as well as his or her opponent. Wiper, a character intent on killing the BigBad of that arc with the Reject Dial, uses the item ''thrice'' (once against one of his CoDragons, once against the Big Bad himself, and once against the beanstalk Giant Jack in order to give Luffy the advantage he needed to get to the Big Bad), and though his body does take massive damage, he escapes alive.
** Luffy's SuperMode techniques, the Gears, are this as well.
*** First is Gear Second, though it mostly applies only Pre-TimeSkip. He uses his legs as a pump to accelerate the blood flow around his body, upgrading his strength and speed dramatically; for a normal human, that much acceleration would make their heart burst, but [[RubberMan Luffy's rubber organs]] can withstand it. When he uses it against Rob Lucci, the DragonInChief not only deduces how the form works, but informs him that it's doing more than severely cutting his stamina, it's actually cutting into his life-force and could shorten his life span! Of course, this doesn't prevent Luffy from using the move ''[[{{Determinator}} twice]]'' in the same fight, and further more times against [[LetsGetDangerous strong opponents. More so in the anime.]]
*** Next is Gear Third, which only applies pre-Time Skip. He blows air into his bones, enlarging his body parts, and consequently his strength, to giant sizes. The downside was that it only worked for long enough to launch a couple of attacks; after that, as the air left Luffy, he was reduced to a Chibi form for a few minutes, leaving him very vulnerable. But post-Time Skip, he's overcome that weakness.
*** But his post-Time Skip technique, Gear Fourth, definitely falls under this trope. [[spoiler:He inflates his muscles rather than his bones and augments his whole body with Armament Haki. His strength skyrockets—Gear Second and Third can't even compare to it—and he can even use the ability to fly. The downside is that it has a time limit, and as soon as that time runs out, Luffy is left in an exhausted mess, unable to use Haki for ten minutes.]] It's a massive trump card…but very dangerous.
** Also pre-Time Skip is Chopper's Monster Point form. By using the Rumble Ball, he can expand his MultiformBalance to have seven forms rather than the standard three afforded to all Zoans. The downside is that the Rumble Ball's effects only last for three minutes, and he can only have one every six hours. If he takes two, he loses control of his transformations, and if he takes three…that's when Monster Point is unleashed. The power of it is incredible, allowing him to instantaneously change which end of a CurbStompBattle he's on, but it's a berserker form, so allies are in as much danger as enemies. The form also requires a colossal amount of energy to maintain; staying in it for too long would kill Chopper, and when he changes back to normal, it takes a long time before he can manage to move anything other than his eyes and mouth. Post-Time Skip, Monster Point is still this, but to a much lesser degree; through research and training, Chopper is now able to enter Monster Point by eating a Rumble Ball and maintain control of the form for three minutes. But it still takes a massive amount of energy; as soon as he turns back, his body is rendered immobile from exhaustion for the next few hours.
** Rob Lucci has one of these as well. The Rokuogan (Six King Gun/Pistol) strikes his opponent with a shock wave comparable to a Reject Dial, but using it expends a ridiculous amount of energy. In fact, using this technique was what led to him losing enough stamina for Luffy to defeat him…albeit barely.
** The Energy Steroids from the Fishman Island arc. They give extremely great power, endurance, and stamina, but every one consumed shortens the consumer's lifespan…and quite possibly their sanity as well.

to:

** In general, ''any'' ability gained by Devil Fruit may be considered this. Some abilities can give is a dangerous technique. While some have specific drawbacks, they all share one: the user amazing powers (some are more useful than others) but it always comes with a potentially lethal side-effect, especially considering permanently [[SuperDrowningSkills loses the ability to swim.]] Considering that this is an OceanPunk series: the user permanently loses the ability to swim. Pirates who take series, that's a chance potentially lethal side effect. Many pirates are aware of this and use the stuff are truly risking their lives, especially those who brave the dangers of the Grand Line.
anyway.
** Trafalgar Law's Devil Fruit, the Op-Op Fruit, deserves special mention for having one of these built in: allows the user, if (s)he so chooses, can user to perform the an "Immortality Operation" [[ItOnlyWorksOnce on one person, which a single person]]. It grants that person the target eternal youth. However, doing so will cost youth, but it costs the user his/her his own life.
** The Alabasta arc introduces Hero Water (Fatal Elixer) in the Alabasta arc. Drinking it (or Fatal Elixir), which massively magnifies increases all of your the drinker's physical attributes abilities for five minutes. Then you die.
minutes before killing him.
** During the Skypiea arc, a device is introduced called The Skypeia arc introduces the Impact Dial, which absorbs any force that strikes it and then deals it back when to the button is pressed, though it seems to cause attacker, but also causes a great deal of pain to the user's wielder's arm. Also introduced is its extremely rare counterpart: Its cousin, the Reject Dial, which deals back multiplies the force absorbed multiplied counter-force by ten. Using that has a large chance of destroying the user as well as his or her opponent. Wiper, a character intent on killing the BigBad of that arc with the Reject Dial, uses the item ''thrice'' (once against one of his CoDragons, once against the Big Bad himself, it three times and once against the beanstalk Giant Jack in order to give Luffy the advantage he needed to get to the Big Bad), and though his body does take escapes alive despite massive damage, he escapes alive.
damage.
** Luffy's SuperMode techniques, the Gears, "Gear" techniques are this as well.
his SuperMode, and they all qualify.
*** First is Gear Second, though it mostly applies only Pre-TimeSkip. He uses Second allows Luffy to use his legs as a pump to accelerate the blood flow around his body, upgrading dramatically increasing his strength and speed dramatically; for speed. It would kill a normal human, that much acceleration would make their heart burst, but [[RubberMan RubberMan Luffy can handle it, although it does affect his lifespan. Luffy's rubber organs]] can withstand it. When he uses it against Rob Lucci, the DragonInChief not only deduces how the form works, but informs him a {{Determinator}}, though, so that it's doing more than severely cutting his stamina, it's actually cutting into his life-force and could shorten his life span! Of course, this doesn't prevent stop him that often.
*** Gear Third is the next level up; he blows air into his bones, which enlarges his body and makes him that much stronger. However, after only a couple of attacks, the effect would wear out, the air would leave his body, and
Luffy from using would now be Chibi-fied and vulnerable. He learned how to avoid that after the move ''[[{{Determinator}} twice]]'' in the same fight, TimeSkip, which introduced...
*** Gear Fourth, where he [[spoiler:inflates his muscles rather than his bones
and further more times against [[LetsGetDangerous strong opponents. More so in the anime.augments his whole body with Armament Haki.]] This is much stronger than ever Gear Third, and he can even [[spoiler:use it to fly.]] But like Gear Third, it has a time limit, after which Luffy becomes vulnerable [[spoiler:and cannot use Haki for ten minutes.]]
*** Next is Gear Third, which only applies pre-Time Skip. He blows air into his bones, enlarging his body parts, and consequently his strength, to giant sizes. The downside was that it only worked for long enough to launch a couple of attacks; after that, as the air left Luffy, he was reduced to a Chibi form for a few minutes, leaving him very vulnerable. But post-Time Skip, he's overcome that weakness.
*** But his post-Time Skip technique, Gear Fourth, definitely falls under this trope. [[spoiler:He inflates his muscles rather than his bones and augments his whole body with Armament Haki. His strength skyrockets—Gear Second and Third can't even compare to it—and he can even use the ability to fly. The downside is that it has a time limit, and as soon as that time runs out, Luffy is left in an exhausted mess, unable to use Haki for ten minutes.]] It's a massive trump card…but very dangerous.
** Also pre-Time Skip is Chopper's Monster Point form. By using form comes from overuse of the Rumble Ball, he can which allows him to expand his MultiformBalance to have seven forms rather than the standard three afforded to all Zoans. three. The downside is that the Rumble Ball's effects effect is already only last for three minutes, and he can have only have one every six hours. If he takes uses two, he loses control of his transformations, and if transformations. If he takes three…that's when uses three, he activates Monster Point is unleashed. The power of it is incredible, allowing him to instantaneously change Point, which end of a CurbStompBattle he's on, but it's a berserker form, so allies are in as much danger as enemies. The form turns him into an indiscriminate berseker who could {{curb stomp|battle}} either his enemies or his allies. It's also requires a colossal amount of energy to maintain; staying in it for too long would kill Chopper, potentially fatal and when he changes back to normal, it takes a long time before he can manage to move anything other than his eyes and mouth. Post-Time Skip, Monster Point is still this, but to a much lesser degree; through research and training, knocks Chopper is now able to enter Monster Point by eating a Rumble Ball and maintain control out of the form commission for three minutes. But a while, although he gets a better handle on it still takes a massive amount of energy; as soon as he turns back, his body is rendered immobile from exhaustion for the next few hours.
post-TimeSkip.
** Rob Lucci has one of these as well. The Lucci's Rokuogan (Six (or Six King Gun/Pistol) Gun) strikes his opponent with a shock wave shockwave comparable to that of a Reject Dial, but using it expends a ridiculous amount of energy. In fact, using this Overuse of the technique was what led to him losing enough stamina for to give Luffy a narrow window to defeat him…albeit barely.
him.
** The Energy Steroids from the Fishman Island arc. They arc give extremely great the user extreme power, endurance, and stamina, staminy, but every one consumed shortens at the consumer's lifespan…and quite expense of his lifespan [[WithGreatPowerComesGreatInsanity and possibly their his sanity as well.]]



** Ichigo's fight with Byakuya woke up his [[SuperPoweredEvilSide inner Hollow]] enough for it to want to begin taking over his soul. The more he used his power, the stronger the Hollow became. He eventually learned how to master the hollow which increased his power in battle. However, it could still take over when he was very close to death, resulting in a truly ghastly outcome for everyone involved. [[spoiler: Only when he learned Final Getsuga Tenshou, which was another example of this trope that destroyed his power after use, was his Hollow fully mastered, and only after he learned the truth about his birth ''and'' how the Hollow was ''his true Zanpakutou'' was he able to face the full truth of his power and accept his Hollow as his true Asauchi.]]
** In his battle with [[MadScientist Mayuri]], Uryuu activated [[OneWingedAngel Letzt Stil]], considered the last resort of the Quincy. His [[OldMaster grandfather]] had taught Uryuu the technique with the stipulation that [[YouAreNotReady he should never use it]] until he found something he was willing to give up his power to protect. Uryuu chose to use the technique prematurely and [[BroughtDownToBadass lost all his spiritual powers]]. His father [[ParentExMachina Ryuuken]] turned out to have an even MORE forbidden technique that could restore Uryuu's powers but it was a very brutal process. [[spoiler:In the Thousand Year Blood War, we learn that there is a way to obtain Letzt Stil powers without the one-time-only drawback...but it is forbidden to traditionalists like the Ishidas as unethical.]]
** Certain [[FunctionalMagic Kidou]] is classified as forbidden. Tessai was exiled with Urahara for using forbidden kidou that manipulated space-time. Yamamoto also used a forbidden sacrificial kidou; he sacrificed his left arm to create a massive pillar of fire in an attempt to kill Aizen, and as atonement, he never re-grew his arm.

to:

** Ichigo's fight with Byakuya woke up his [[SuperPoweredEvilSide inner Hollow]] enough for it to want to begin taking over his soul. The more he used his power, the stronger the Hollow became. He eventually learned how to master the hollow hollow, which increased his power in battle. However, it could still take over when he was very close to death, resulting in a truly ghastly outcome for everyone involved. [[spoiler: Only when he learned Final Getsuga Tenshou, which was another example of this trope that destroyed his power after use, was his Hollow fully mastered, and only after he learned the truth about his birth ''and'' how the Hollow was ''his true Zanpakutou'' was he able to face the full truth of his power and accept his Hollow as his true Asauchi.mastered.]]
** In his battle with [[MadScientist Mayuri]], Uryuu activated [[OneWingedAngel Letzt Stil]], considered the last resort of the Quincy. His [[OldMaster grandfather]] had taught Uryuu him the technique with the stipulation that [[YouAreNotReady he should never use it]] until he found something he was willing to give up his power to protect. Uryuu chose to use the technique prematurely prematurely, found out that ItOnlyWorksOnce, and [[BroughtDownToBadass lost all his spiritual powers]]. His father [[ParentExMachina Ryuuken]] turned out to have an even MORE ''more'' forbidden technique that could restore Uryuu's powers powers, but it was a very brutal process. [[spoiler:In the Thousand Year Blood War, we learn that there is a way to obtain Letzt Stil powers without the one-time-only drawback...drawback, but it is forbidden to traditionalists like the Ishidas as unethical.]]
** Certain [[FunctionalMagic Kidou]] is classified as are forbidden. Tessai was exiled with Urahara for using a forbidden kidou Kidou that manipulated space-time. Yamamoto also used a forbidden sacrificial kidou; he sacrificed Kidou, trading his left arm to create for a massive pillar of fire in [[KillItWithFire an attempt to kill Aizen, and Aizen]]; as an atonement, he never re-grew his arm.it.



** Industrial Illusions has the [[IdiotBall decidedly odd practice]] of designing cards "too powerful and dangerous to be used," requiring they be sealed somewhere or guarded to keep them from falling into the wrong hands. They ''always'' fall into the wrong hands. (It's little wonder why the game is such SeriousBusiness in this series.) Yugi himself seems to be the only one who recognizes the potential danger of these cards; the first thing he says upon winning Osiris from Strings is, "I must be ''very'' careful with this..."
** In ''Anime/YuGiOhGX'', there's also something called the "Cyber Legacy", which Kaiser Ryō is the inheritor to. Normally, he and the other duelists in the Cyber-Style dojo (yes, the Legacy is apparently so powerful, you need to train in a dojo to properly duel with it) practice the normal Cyber-Style (Cyber Dragon and other Cyber-type monsters), but there's another set of cards known as the Cyberdark-Style that's sealed away from even the Legacy's heir due to its immense and dangerous power. [[spoiler:Ryo learns just why it's so dangerous and forbidden [[ThisIsYourBrainOnEvil the hard way]].]]
** In the real game cards deemed too powerful are forbidden from official tournaments. If only they could be consistent on what overpowered means.
* Ryoga Hibiki's "Shishi Hōkōdan" in ''Manga/RanmaOneHalf''. This [[KiAttacks Ki Attack]] is fueled by the user's depression and melancholy. So to acquire more power the user will purposely do things to become more depressed. When Cologne sees Ranma and Ryoga trying to out-depress each other while blasting the technique freely, she compares them to a pair of lions fighting as they roll off a precipice and to their deaths.
** The Shishi Hōkōdan is actually an interesting example on two accounts. First, Ranma tries and fails to beat Ryoga at his own game, and realizes the flaw in the principle-namely, as the tide of battle turns, the loser will gain great power for the technique by his depression at losing the fight while the winner's lightened spirits will depower the technique. So he creates his own, Not-So-Dangerous, Not-Actually-Forbidden Technique in the form of a KiAttack fueled by boundless confidence. Second, Ryoga is baffled when the scroll he learns the technique from indicates a general sense of downwardness; it turns out that in it's purest form Shishi Hōkōdan isn't a directed beam, it's more like a weight dropping on the user from the heavens; the user is protected from his own attack because he's emotionally empty when he uses it. Ranma uses this against Ryoga by jolting him out of his reverie mid-attack with [[PantyShot something he knows Ryoga wants from Akane]]; the surging hope and anticipation leave Ryoga open to being clobbered by his own technique.
** Surprisingly, Genma himself developed his own DangerousForbiddenTechnique: the [[CombatPragmatist Yamasenken]] and [[StealthRun Umisenken]], seriously and unusually (for this series) lethal techniques which equate the structure of a body with that of a house. Though initially developed [[spoiler: as tools for burglary and thievery]], the techniques comprised by these two schools are designed for fun things such as ripping out an opponent's heart, tearing an opponent's throat, strangulation, and cutting up enemies into itty bitty pieces using nothing but air pressure. Genma was loath to teach Ranma anything about them, on the grounds that they were far too dangerous, and only acquiesced when he learned Ryu Kumon was using the Yamasenken. Even then, when Ranma and Ryu dueled using these two opposite schools, Ranma did so with the stipulation that, if he won, Ryu would seal the techniques forever.
** Parodied with Happosai's "Happo Fire Burst", which was sealed away for being too destructive... when he accidentally [[DirtyOldMan burnt up a recently-stolen brassiere with it]]. He unseals it to punish Soun Tendo and the Saotomes... and then it turns out to be nothing more than a fancy name for throwing homemade firecracker bombs around. [[ImprobableWeaponUser They are actually quite effective weapons, though.]]
* ''Manga/OutlawStar'' featured the Caster gun which fired spiritual Caster Bullets (each type represented by a number, but the differences were never fully established for most of them.) Eventually, Gene realizes that there are three numbers that never come up, so he tracks down the gunsmiths that make these bullets. Each one gives him one of these bullets (except for the #4 bullet, which he receives 2 of), but explain that they draw on the gunner's soul, so if he fires all three, he will die. Sure enough, he needs all three.
** A slight inversion in the fact that these shells weren't originally designed to be harmful. It's just that there's so little mana left in the universe, that [[CastFromHitPoints taking away lifeforce]] is the only thing powerful enough left. And when he did fire his last shell, he did drop dead; so did his enemy. He was saved because the place he was in ([[spoiler:the Galactic Leyline]]) noticed ''everyone'' inside was dead and performed an AutoRevive.
* Almost everybody in ''GetBackers'': Ginji starts going crazy if in his Lightning Emperor mode for too long; Ban can only use his Jagan three times a day, once per person per day; Himiko's acceleration perfume strains her body; Juubei's Black Flying Needles are controlled by a large magnet, and the force of the magnetic field wreaks all kinds of havoc on his body and blinds him early on.

to:

** Industrial Illusions has the [[IdiotBall decidedly odd practice]] of designing cards "too powerful and dangerous to be used," requiring they them to be sealed somewhere or guarded to keep them from falling into the wrong hands. They ''always'' fall into the wrong hands. (It's little wonder why the game is such SeriousBusiness in this series.) Yugi himself seems to be the only one who recognizes the potential danger of these cards; the first thing he says upon winning Osiris from Strings is, "I must be ''very'' careful with this...this."
** In ''Anime/YuGiOhGX'', there's also something called ''Anime/YuGiOhGX'' has the "Cyber Legacy", which Kaiser Ryō is the inheritor to. inherited. Normally, he and the other duelists in the Cyber-Style dojo (yes, the Legacy is apparently so powerful, you need to train in a dojo to properly duel with it) practice the normal Cyber-Style (Cyber Dragon and other Cyber-type monsters), Cyber-Style, but there's another set of cards known as the Cyberdark-Style that's sealed away from even the Legacy's heir due to its immense and dangerous power. [[spoiler:Ryo learns just why it's so dangerous and forbidden [[ThisIsYourBrainOnEvil the hard way]].]]
** In the real game game, cards deemed too powerful are forbidden from official tournaments. If only they could be Unfortunately, they're not always consistent on as to what overpowered means.
exactly is "too powerful".
* ''Manga/RanmaOneHalf'':
**
Ryoga Hibiki's "Shishi Hōkōdan" in ''Manga/RanmaOneHalf''. This [[KiAttacks Ki Attack]] is a {{Ki Attack|s}} fueled by the user's [[EmotionalPowers depression and melancholy. So melancholy]]. Ryoga tries to acquire more increase its power the user will purposely do things to become more by becoming even ''more'' depressed. When Cologne sees Ranma and Ryoga trying to out-depress each other while blasting the technique freely, she compares them to a pair of lions fighting as they roll off a precipice and to their deaths.
** The Shishi Hōkōdan is actually an interesting example on two accounts. First,
Ranma tries and fails to beat Ryoga at his own game, and realizes this when fighting him but eventually sees the flaw in this strategy -- the principle-namely, as winner of the tide of battle turns, the loser fight will gain great power for the be happy enough to depower it -- and thus creates a much safer (but just as powerful) technique by his depression at losing the fight while the winner's lightened spirits will depower the technique. So he creates his own, Not-So-Dangerous, Not-Actually-Forbidden Technique in the form of a KiAttack fueled by based on boundless confidence. Second, Ryoga is baffled when the scroll he learns the technique from indicates a general sense of downwardness; it turns out that in it's purest form Shishi Hōkōdan isn't a directed beam, it's more like a weight dropping on the user from the heavens; the user is protected from his own attack because he's emotionally empty when he uses it. Ranma uses this against Ryoga by jolting him out of his reverie mid-attack with [[PantyShot something he knows Ryoga wants from Akane]]; the surging hope and anticipation leave Ryoga open to being clobbered by his own technique.
confidence.
** Surprisingly, Genma himself developed his own DangerousForbiddenTechnique: two such techniques: the [[CombatPragmatist Yamasenken]] and [[StealthRun Umisenken]], seriously and unusually (for Umisenken]]. Unusually for this series) series, they're both lethal techniques which equate the structure of a body with that of a house. Though initially developed [[spoiler: as tools and can be used for burglary and thievery]], the techniques comprised by these two schools are designed for fun things such as [[AndShowItToYou ripping out an opponent's heart, tearing an opponent's throat, strangulation, and heart]], strangling him, or cutting up enemies him into itty bitty pieces using nothing but air pressure. Genma pieces. Ganma was loath to teach Ranma anything about them, on the grounds ground that they were far too dangerous, and dangerous; he only acquiesced when he learned that Ryu Kumon was using the Yamasenken. Even then, when Ranma and would duel Ryu dueled using these two opposite schools, Ranma did so with the stipulation that, that if he won, Ryu would seal the techniques forever.
** Parodied with Happosai's "Happo Fire Burst", which was sealed away for being too destructive... when he accidentally [[DirtyOldMan burnt up a recently-stolen brassiere with it]]. He unseals it to punish Soun Tendo and the Saotomes... and then Saotomes, when it turns out to be nothing more than a fancy name for throwing homemade firecracker bombs around. [[ImprobableWeaponUser around ([[ImprobableWeaponUser which is no less effective]]).
* ''Manga/OutlawStar'''s Caster gun fired spiritual Caster bullets. Each type was represented by a number, although their differences were never fully established. Eventually, Gene realizes that three numbers never come up, so he tracks down the gunsmiths who make these bullets.
They are actually quite effective weapons, though.each give him one, but they explain that since they draw on the gunner's soul (there being so little mana left in the universe), if he fires all three, he will die. Sure enough, he needs all three, and sure enough, [[spoiler:he dies along with his enemy, but he was in the Galactic Leyline, which noticed that ''everyone'' inside was dead and performed an AutoRevive.]]
* ''Manga/OutlawStar'' featured the Caster gun which fired spiritual Caster Bullets (each type represented by a number, but the differences were never fully established for most of them.) Eventually, Gene realizes that there are three numbers that never come up, so he tracks down the gunsmiths that make these bullets. Each one gives him one of these bullets (except for the #4 bullet, which he receives 2 of), but explain that they draw on the gunner's soul, so if he fires all three, he will die. Sure enough, he needs all three.
** A slight inversion in the fact that these shells weren't originally designed to be harmful. It's just that there's so little mana left in the universe, that [[CastFromHitPoints taking away lifeforce]] is the only thing powerful enough left. And when he did fire his last shell, he did drop dead; so did his enemy. He was saved because the place he was in ([[spoiler:the Galactic Leyline]]) noticed ''everyone'' inside was dead and performed an AutoRevive.
* Almost everybody in ''GetBackers'': ''GetBackers'' has one. Ginji starts going crazy if he is in his Lightning Emperor mode for too long; long. Ban can only use his Jagan three times a day, once per person per day; day. Himiko's acceleration perfume strains her body; body. Juubei's Black Flying Needles are controlled by a large magnet, and the force of the magnetic field wreaks all kinds of havoc on his body and blinds him early on.



* ''Manga/MahouSenseiNegima'''s version of BlackMagic seems to act like this. The first time we see it used is when Jack Rakan demonstrates it for Negi and nearly kills himself in the process. Negi then starts undergoing training so that he'll be able to use it safely. [[spoiler:In Chapter 249, we see the first sign of the possible consequence of using Magia Erebia.]]
** And [[spoiler: chapter 265, we see [[UnstoppableRage just why]] this could become a problem]].
** And the ''real'' direct consequence of Dark Magic finally shows up with [[spoiler:Negi basically overdosing on magic and poisoning himself, which is now requiring him to have to battle inside himself to get an upper hand on the dark magic. Eva isn't even sure this is ''possible'' because as she noted earlier, Negi has already surpassed her in his mastery of this technique. Oh, and even if he wins he apparently won't be exactly human anymore.]]
** And even then, it's only a temporary fix.
* In ''LightNovel/{{Slayers}}'', Lina's Giga Slave is the mother of all [[DangerousForbiddenTechnique Dangerous Forbidden Techniques]]: It consists of [[spoiler:summoning a fragment of [[{{God}} Lord Of Nightmares]] into the physical plane]], so not only will she die if it is miscast, but she'll take the entire universe with her. [[spoiler: Naturally, it's miscast, and only a literal DeusExMachina on the part of the Lord of Nightmares saves the day.]] Ragna Blade also counts, since it consumes magic quickly enough to put the caster's life in danger if they try to maintain it for too long.
* Suffering from DatingSim withdrawal, Keima of ''Manga/TheWorldGodOnlyKnows'' resorts to "Capturing God Mode" in order to clear his backlog, playing six games at once at blinding speed while still able to react emotionally to each one, and eventually passes out under the strain.
** One hour after the mode is activated, its user will have lost three years of his life! (Or at least he'll be so tired it feels that way!)
** He then takes it even further by playing "24" games at once.
* It's revealed in ''Anime/MagicalGirlLyricalNanohaStrikers'' that [[FinishingMove Starlight Breaker]] causes considerable strain on Nanoha's body, and that her constant usage of it, as well as her tendency to use {{Deadly Upgrade}}s, led to her being critically injured and hospitalized for nearly a year.
** Actually, it was Nanoha's [[TrainingFromHell WAY too severe for her well-being training regimen]] that resulted in her being low on energy during a battle, and the wounds she got very nearly killed her. However, the DeadlyUpgrade that is the Blaster System defintely qualifies for this trope: if Nanoha's body is likened to a massive wooden building with fireplaces which supply magic to her, the Blaster System doesn't add fuel to the fire so much as it ''sets part of the building ablaze.'' In the following supplements, it's revealed that [[spoiler: her use of the Blaster System during the JS incident permanently decreased her magical potential by about eight percent.]]
*** It is, however, revealed that the [[WaveMotionGun Starlight Breaker]] compresses magic in such a way that when used the way Nanoha does it, compared to the way Reinforce [[SphereOfDestruction used it]], actually does put tremendous strain on her body, when combined with her training regimen, is what caused her to get critically injured.
* Jin from ''Anime/SamuraiChamploo'' learns his master's DangerousForbiddenTechnique only by word of mouth, along with (needless) explanation of its danger. During his final episode duel, he has to use it in battle. [[spoiler: He allows himself to be stabbed, and takes advantage of his opponent's position at his side and effective defenselessness (his sword is stuck in Jin) to strike him down.]]
* ''Anime/ZoidsNewCentury'' has a mecha version: Among the three alternate armours available for the Liger Zero is the [[MechaExpansionPack Panzer armour]]- effectively turning the Liger into a walking tank with [[WaveMotionGun huge guns]] and [[MacrossMissileMassacre lots and lots and LOTS of missiles]]. However, it's so [[DeadlyUpgrade heavy and power-consuming that the Liger can barely move, and quickly overheats just from wearing the armour]]. The armour is still useful, but has to be ejected on the battlefield right after each use to avoid melting the Liger Zero.
* In ''Manga/SoulEater'', using Tsubaki's [[spoiler:Uncanny Sword]] mode takes a toll on Black☆Star's health. Early on, he can only maintain it for a short duration before passing out. At one point, the normally submissive Tsubaki refuses to use it out of fear for her partner's well-being. [[spoiler: Eventually, he finds a way around this, at which point the mode apparently stops having a dangerous effect. Really, all it needed was for Black Star to ''listen'' to others (namely Tsubaki) in order to have a chance of working out the technique, rather than assuming it took only physical strength. Being [[JerkWithAHeartOfGold a decent guy really]], he manages it.]]
* Two notable examples exist in ''Franchise/SailorMoon'': Sailor Pluto, who will die if she uses the power to stop time, and Sailor Saturn, who will die if she uses her power of destruction.
** They [[spoiler:both break the taboo in the [[Manga/SailorMoon manga]] anyway and actually do die -- in Pluto's case for a whole arc -- before coming back fairly nonchalant and well-adjusted about the whole thing.]]
** In the [[Anime/SailorMoon anime]] there's also the whole Silver Crystal bit - use it at full power, which equates to a KamehameHadoken 9 times out of 10, and the user is killed. They get one last wish, though and it's usually enough to reverse it: Moon's last wish was to have her normal life back and it was enough for her, Mamoru and the Senshi to be revived, even if with TraumaInducedAmnesia until some time later.
* In ''Manga/YuYuHakusho'', Hiei's Dragon of the Darkness Flame is an absurdly powerful technique that summons a dragon made of insanely hot hellfire that incinerates pretty much any enemy that comes into direct contact with it, even fire-resistant demons. The catch? If the user isn't sufficiently powerful enough, the dragon can turn on the caster and devour him. [[spoiler: Also subverted, as the one moment the attack ''is'' turned on Hiei, he's become powerful enough to control it, not only surviving, but also temporarily absorbing it into his body, becoming much, much more powerful.]]
** The first time he used it, he also had to offer the use of his right arm as a sacrifice.
* Train from ''Manga/BlackCat'' can only use railguns 5 times per day. In the final battle, he squeezed out 6th shot, resulting in him unable to perform it anymore. He's not worried, though, since he has already taken care of the BigBad.
** And Sven's eye ability makes him very tired after using it, which limits him as well, though his ability isn't near as badass.
* Parodied in ''Manga/NininGaShinobuden'', where the technique that has been "banned ten years ago because it was so dangerous" is...duct tape underpants.
* In ''Manga/CodeBreaker'', Toki Fujiwara's usage of his Gauss Cannon will damage whatever arm that he uses to fire. Thus meaning he can't fire more than twice overall in a fight. Every code breakers are in danger of suffering "after effects" when they overexceed usage of their powers.
* The Experts in ''Manga/GiantRobo'' apparently have this. For some, using their powers to an extraordinary extent is this -- we get to see a mook burn himself to near-ashes with his pyrokinesis, trying to keep his buddies warm. For others, using their powers in excessive ways is this -- [[spoiler:Alberto the Shockwave breaks apart after absorbing the Monster Sphere's energy field, for example]]. And for at least one, using his power ''at all'' is this.

to:

* ''Manga/MahouSenseiNegima'''s version of BlackMagic seems to act like this. The first time we see it used is when Jack Rakan demonstrates it for Negi and nearly kills himself in the process. Negi then starts undergoing training so that he'll be able to use it safely. [[spoiler:In Chapter 249, we We don't see the first sign real direct consequences of the possible consequence of using Magia Erebia.Dark Magic, though, until [[spoiler:Negi basically overdoses on magic and is forced to fight his EnemyWithin; even if he wins, he won't exactly be human anymore.]]
** And [[spoiler: chapter 265, we see [[UnstoppableRage just why]] this could become a problem]].
** And the ''real'' direct consequence of Dark Magic finally shows up with [[spoiler:Negi basically overdosing on magic and poisoning himself, which is now requiring him to have to battle inside himself to get an upper hand on the dark magic. Eva isn't even sure this is ''possible'' because as she noted earlier, Negi has already surpassed her in his mastery of this technique. Oh, and even if he wins he apparently won't be exactly human anymore.]]
** And even then, it's only a temporary fix.
* In ''LightNovel/{{Slayers}}'', Lina's Giga Slave is the mother of all [[DangerousForbiddenTechnique Dangerous Forbidden Techniques]]: Techniques]]. It consists of [[spoiler:summoning a fragment of the [[{{God}} Lord Of of Nightmares]] into the physical plane]], so not only will she die if it is miscast, but she'll take the entire universe with her. [[spoiler: Naturally, it's miscast, and only a literal DeusExMachina on the part of the Lord of Nightmares saves the day.]] Ragna Blade also counts, since it consumes magic quickly enough to put the caster's life in danger if they try to maintain it for too long.
* {{Parodied|Trope}} in ''Manga/TheWorldGodOnlyKnows'': Suffering from DatingSim withdrawal, Keima of ''Manga/TheWorldGodOnlyKnows'' resorts to "Capturing God Mode" in order to clear his backlog, playing six games at once at blinding speed while still able to react emotionally to each one, and one. He claims that an hour will cause the use to lose three years of his life (or at least be tired enough to feel that way). He eventually passes out under the strain.
** One hour after the mode is activated, its user will have lost three years of his life! (Or at least he'll be so tired it feels that way!)
** He then takes it even further by playing "24"
strain. That doesn't stop him from hitting ''24'' games at once.
once later in the series.
* It's revealed in ''Anime/MagicalGirlLyricalNanohaStrikers'' that [[FinishingMove Starlight Breaker]] causes considerable strain on Nanoha's body, and that her constant usage of it, as well as her tendency to use {{Deadly Upgrade}}s, led contributed to her being critically injured and hospitalized for nearly a year.
** Actually, it was Nanoha's [[TrainingFromHell WAY too severe for her well-being training regimen]] that resulted in her being low on energy during a battle, and the wounds she got very nearly killed her. However, the DeadlyUpgrade that is the Blaster System defintely qualifies for this trope: if Nanoha's body is likened to a massive wooden building with fireplaces which supply magic to her, the Blaster System doesn't add fuel to the fire so much as it ''sets part of the building ablaze.'' In the following supplements, it's revealed that [[spoiler: her use of the Blaster System during the JS incident permanently decreased her magical potential by about eight percent.]]
*** It is, however, revealed that the [[WaveMotionGun Starlight Breaker]] compresses magic in such a way that when used the way Nanoha does it, compared to the way Reinforce [[SphereOfDestruction used it]], actually does put tremendous strain on her body, when combined with her training regimen, is what caused her to get critically injured.
* Jin from ''Anime/SamuraiChamploo'' learns his master's DangerousForbiddenTechnique only by word of mouth, along with (needless) explanation of its danger. During his final episode duel, he has to use it in battle. [[spoiler: He [[spoiler:He allows himself to be stabbed, and takes advantage of his opponent's position at his side and effective defenselessness (his (as his sword is stuck in Jin) to strike him down.]]
* ''Anime/ZoidsNewCentury'' has a mecha version: Among the three alternate armours available for the Liger Zero is the [[MechaExpansionPack Panzer armour]]- armour]], effectively turning the Liger into a walking tank with [[WaveMotionGun huge guns]] and [[MacrossMissileMassacre lots and lots and LOTS of missiles]]. However, it's so [[DeadlyUpgrade heavy and power-consuming that the Liger can barely move, move and quickly overheats just from wearing the armour]]. The armour is still useful, but It has to be ejected on the battlefield right after each use to avoid melting the Liger Zero.
* In ''Manga/SoulEater'', using Tsubaki's [[spoiler:Uncanny Sword]] mode Sword mode]] takes a toll on Black☆Star's health. Early on, he can only maintain it for a short duration before passing out. At one point, the normally submissive Tsubaki refuses to use it out of fear for her partner's well-being. [[spoiler: Eventually, he finds a way around this, at which point the mode apparently stops having a dangerous effect. Really, all it needed was for Black Star to ''listen'' to others (namely Tsubaki) in order to have a chance of working out the technique, rather than assuming it took only physical strength. Being [[JerkWithAHeartOfGold a decent guy really]], he manages it.]]
* Two notable examples exist in ''Franchise/SailorMoon'': ''Franchise/SailorMoon'':
**
Sailor Pluto, who Pluto will die if she uses the her power to stop time, and Sailor Saturn, who will die if she uses her power of destruction.
**
destruction. They [[spoiler:both break the taboo in the [[Manga/SailorMoon manga]] anyway and actually do die -- in Pluto's case for a whole arc -- before coming back fairly nonchalant and well-adjusted about the whole thing.]]
** In the [[Anime/SailorMoon The anime]] there's also gives us the whole Silver Crystal bit - use it Crystal, which at full power, which power equates to a KamehameHadoken 9 and kills the user nine times out of 10, and the user is killed. They ten. But they get one last lash wish, though and it's which is usually enough to reverse it: Moon's last wish was to have revers it; Moon got her normal life back and it was enough for her, Mamoru and the Senshi to be revived, even if with TraumaInducedAmnesia until some time later.
* In ''Manga/YuYuHakusho'', Hiei's Dragon of the Darkness Flame is an absurdly powerful technique that summons a dragon made of insanely hot hellfire that incinerates pretty much any enemy that comes into direct contact with it, even fire-resistant demons. The catch? If the user isn't sufficiently powerful enough, powerful, the dragon can turn on the caster and devour him.him. And the first time Hiei used it, he had to offer his right arm as a sacrifice. [[spoiler: Also subverted, as the one moment the attack ''is'' turned on Hiei, he's become powerful enough to control it, not only surviving, but also temporarily absorbing it into his body, becoming much, much more powerful.]]
* ''Manga/BlackCat'':
** The first time he used it, he also had to offer the use of his right arm as a sacrifice.
*
Train from ''Manga/BlackCat'' can only use railguns 5 five times per day. In the final battle, he squeezed out 6th a sixth shot, resulting in him unable to perform it anymore. He's not worried, though, since he has already taken care of the BigBad.
** And Sven's eye ability makes him very tired after using it, which limits him as well, though his ability isn't near as badass.
* Parodied in ''Manga/NininGaShinobuden'', where the technique that has been "banned ten years ago because it was so dangerous" is...is [[DuctTapeForEverything duct tape underpants.
underpants]].
* In ''Manga/CodeBreaker'', Toki Fujiwara's usage of his Gauss Cannon will damage whatever arm that he uses to fire. Thus meaning Ths means he can't fire more than twice overall in a fight. Every code breakers are in danger fight.
* Overuse
of suffering "after effects" when they overexceed usage of their powers.
* The Experts
power in ''Manga/GiantRobo'' apparently have this. For some, using their powers can lead to an extraordinary extent is this -- we get to see a nasty consequences. A mook burn burns himself to near-ashes with his pyrokinesis, pyrokinesis trying to keep his buddies warm. For others, using their powers in excessive ways is this -- [[spoiler:Alberto warm, Alberto the Shockwave breaks [[spoiler:breaks apart after absorbing the Monster Sphere's energy field, for example]]. And for at least one, using his power ''at all'' is this.field]], and several characters' powers run fatal risks.



* In ''Manga/SaintSeiya'', Dragon Saint Shiryu was warned by his master never to push his fighting technique beyond a certain limit, lest he unleash the "Ultimate Dragon", basically sending himself and his opponent into orbit. Of course, Shiryu ''does'' end up unleashing the "Ultimate Dragon". [[spoiler: But he doesn't die. His opponent Shura has a last-minute change of heart and manages to send him back to Earth with just a very well-timed kick. Seriously.]] That being said, the technique was never used again in the manga. In the [[{{Filler}} next arc]] of the anime, Shiryu attempted it again as a last resort move against an opponent that had beat everyone else, but stopped when doing so would destroy a MacGuffin that was needed.
** Athena Exclamation, a technique so devastating, so powerful, it has the power to annihilate the Earth. Therefore, it was declared taboo by Athena's Saints. It consists of three Gold Saints focusing all their [[BattleAura Cosmo]] into a single point, discharging a blast with the same power as the Big Bang itself. Naturally, it was used in the final arc. And once ''that'' taboo [[GodzillaThreshold was broken]], it was used twice more --by [[OhCrap two opposing trios of Gold Saints]].

to:

* In ''Manga/SaintSeiya'', ''Manga/SaintSeiya'':
**
Dragon Saint Shiryu was is warned by his master never to push his fighting technique beyond a certain limit, lest he unleash the "Ultimate Dragon", basically sending himself and his opponent into orbit. Of course, Shiryu ''does'' end up unleashing the "Ultimate Dragon". [[spoiler: But he doesn't die. His opponent Shura has a last-minute change of heart and manages to send him back to Earth with just a very well-timed kick. Seriously.]] That being said, the technique was never used again in the manga. In the [[{{Filler}} next arc]] of the anime, Shiryu attempted it again as a last resort move against an opponent that had beat everyone else, move, but stopped when doing so would destroy a MacGuffin that was needed.
** Athena Exclamation, Exclamation is a technique so devastating, so powerful, it has the power to annihilate the Earth. Therefore, it was declared taboo by Athena's Saints. It consists of three Gold Saints focusing all their [[BattleAura Cosmo]] into a single point, discharging a blast with the same power as the Big Bang itself. Naturally, it was used in the final arc. And once ''that'' taboo [[GodzillaThreshold was broken]], it was used twice more --by -- by [[OhCrap two opposing trios of Gold Saints]].



* ''Manga/ThePrinceOfTennis'':
** The technique "Dash Hadoukyuu", [[TheBigGuy Kawamura's]] most powerful shot [[spoiler: until Final Hadoukyuu]]. The original Hadoukyuu already puts a great deal of strain on the arm, while the Dash Hadoukyuu is restricted to once per match. [[spoiler: Naturally, he breaks this rule against Gin Ishida]].
** There are quite a few others as well: Tezuka Phantom and Zero Shiki Serve, Ryoma's Cyclone Smash, Atobe's Tannhauser Serve, Sanada's Rai...

to:

* ''Manga/ThePrinceOfTennis'':
**
Everyone seems to have one in ''Manga/ThePrinceOfTennis'': Tezuka Phantom and Zero Shiki Serve, Ryoma's Cyclone Smash, Atobe's Tannhauser Serve, Sanada's Rai, you name it. The technique most powerful, though, is "Dash Hadoukyuu", [[TheBigGuy Kawamura's]] most powerful shot [[spoiler: until Final Hadoukyuu]]. The original Hadoukyuu already puts a great deal of strain on the arm, while the Dash Hadoukyuu is restricted to once per match. [[spoiler: Naturally, he breaks this rule against Gin Ishida]].
** There are quite a few others as well: Tezuka Phantom and Zero Shiki Serve, Ryoma's Cyclone Smash, Atobe's Tannhauser Serve, Sanada's Rai...
Ishida]].



* In ''Anime/MobileSuitGundamAGE'', Kio views the AGE-FX's [[SuperMode FX-Burst Mode]] as this, as he has recently made the switch to [[TechnicalPacifist technical pacifism]], and he [[MutuallyExclusivePowerups can't use]] the [[AttackDrone precision weapons]] necessary to guarantee the safety of enemy pilots while using that mode.
* ''Anime/GundamBuildFightersTry'' has "assimilation", a not-very-well-explained phenomenon where a pilot apparently links his mind to his Gunpla, controlling it like his own body and greatly increasing its performance. Downsides? The pilot incurs actual, ''physical'' injuries when the Gunpla is damaged, and on top of that, using this ability is exhausting in the extreme. There is a real risk of receiving permanent or even ''life-threatening'' injuries from this, in a sport that's supposed to be completely harmless (at least, to the people playing it).

to:

* In ''Anime/MobileSuitGundamAGE'', Kio views the AGE-FX's [[SuperMode FX-Burst Mode]] as this, one, as he has recently made the switch to [[TechnicalPacifist technical pacifism]], and he [[MutuallyExclusivePowerups can't use]] the [[AttackDrone precision weapons]] necessary to guarantee the safety of enemy pilots while using that mode.
* ''Anime/GundamBuildFightersTry'' has "assimilation", a not-very-well-explained phenomenon where a pilot apparently links his mind to his Gunpla, controlling it like his own body and greatly increasing its performance. Downsides? The pilot incurs actual, ''physical'' injuries when the Gunpla is damaged, and on top of that, using this ability is exhausting in the extreme. There is a real risk of receiving permanent or even ''life-threatening'' life-threatening injuries from this, in a sport that's supposed to be completely harmless (at least, to the people playing it).



* Few would expect this from an anime about the ''circus,'' but the arcplot of ''Anime/KaleidoStar'' revolved around one of these. There was a DangerousForbiddenTechnique for trapeze and highwire artists, the [[spoiler: Fantastic Maneuvre]], that was ''so'' dangerous and forbidden, Fool refused to even tell Sora what it was because as soon as she heard about it, she would be so obsessed with it that she'd try it even when she wasn't ready, and die.
** Attempting this DangerousForbiddenTechnique was what killed [[spoiler: Karlos']] best friend and old partner [[spoiler: Aaron Killian]], becoming [[MyGreatestFailure His Greatest Failure]] and turning him into TheAtoner. [[spoiler: And it drives Aaron's son Yuri to seek revenge against Kalos, taking the Stage away from him because he believes he drove his father to basically kill himself.]]
** Needless to say, by the end of the first part of the series, [[spoiler: Sora and Layla]] perform it successfully. Doing it even once is enough to [[spoiler: cripple an ''already'' injured Layla for life [[CareerEndingInjury and end her circus career forever]].]]

to:

* Few would expect this from an anime about the ''circus,'' but the arcplot arc of ''Anime/KaleidoStar'' revolved around one of these. There was a DangerousForbiddenTechnique for trapeze and highwire artists, the [[spoiler: Fantastic Maneuvre]], that which was ''so'' dangerous and forbidden, Fool refused to even tell Sora what it was because as soon as she heard about it, she would be so obsessed with it that she'd try it even when she wasn't ready, and die.
**
die. Attempting this DangerousForbiddenTechnique was what killed [[spoiler: Karlos']] best friend and old partner [[spoiler: Aaron Killian]], becoming [[MyGreatestFailure His Greatest Failure]] and turning him into TheAtoner. [[spoiler: And it drives Aaron's son Yuri to seek revenge against Kalos, taking the Stage away from him because he believes he drove his father to basically kill himself.]]
**
]] Needless to say, by the end of the first part of the series, [[spoiler: Sora and Layla]] perform it successfully. Doing it even once is enough to [[spoiler: cripple an ''already'' injured Layla for life [[CareerEndingInjury and end her circus career forever]].]]



* Being a Deconstruction of the FightingSeries PlayedForLaughs, MutekiKanbanMusume parodies this trope when Kankuro tries to decide what thing he would imitate to beat Miki.
--> '''Kankuro:''' ''[[PowerCopying As long as I imagine myself as something before training, I’ll gain both confidence and strength,]] [[VerbalTic nya]]. What should I imagine myself as next, [[VerbalTic nya]]?''
-->'''Akihiko:''' ''Shouldn’t you have already decided on that?''
-->Flashback of Miki being {{Curb Stomp Battle}}d by her mother, a fat restaurant hostess.
-->'''Kankuro:''' ''That’s impossible, [[VerbalTic nya]].''

to:

* Being a Deconstruction {{Deconstruction}} of the FightingSeries PlayedForLaughs, MutekiKanbanMusume parodies this trope when Kankuro tries to decide what thing he would imitate to beat Miki.
--> '''Kankuro:''' ''[[PowerCopying [[PowerCopying As long as I imagine myself as something before training, I’ll gain both confidence and strength,]] [[VerbalTic nya]]. What should I imagine myself as next, [[VerbalTic nya]]?''
nya]]?
-->'''Akihiko:''' ''Shouldn’t Shouldn’t you have already decided on that?''
-->Flashback
that?
-->''Flashback
of Miki being {{Curb Stomp Battle}}d by her mother, a fat restaurant hostess.
hostess.''
-->'''Kankuro:''' ''That’s That’s impossible, [[VerbalTic nya]].''



* ''LightNovel/HighSchoolDXD'' gives us Juggernaut Drive, which allows the users of [[EmpathicWeapon Boosted Gear or Divine Dividing]] to completely unseal the Dragon contained within, transforming into a near-unstoppable, monstrous form that goes on a berserker rampage until the user's life is consumed. Both [[TheHero Issei]] and [[TheRival Vali]] have to find a way around this. [[spoiler:Vali has, long before the start of the series - BornWinner he is, has a ''stupid'' amount of Devil-power and fuels his JD with that instead of his lifeforce. Issei forgoes the form entirely in favor of creating Cardinal Crimson Promotion, an exhausting but near-equal power boost that relies on his link to Rias, befitting his role as TheChampion.]]
* In both ''Manga/GetterRobo G'' and its {{expy}} ''Anime/{{Gekiganger 3}}'', the Shine Spark and the Gekigan Flare is considered this. This is because the three pilots have to hit a switch ''at the same time'' to activate the attack or risk destroying the robot.

to:

* ''LightNovel/HighSchoolDXD'' gives us Juggernaut Drive, which allows the users of [[EmpathicWeapon Boosted Gear or Divine Dividing]] to completely unseal the Dragon contained within, transforming into a near-unstoppable, monstrous form that goes on a berserker rampage until the user's life is consumed. Both [[TheHero Issei]] and [[TheRival Vali]] have to find a way around this. [[spoiler:Vali has, long before the start of the series - BornWinner -- as a BornWinner, he is, has a ''stupid'' amount of Devil-power and fuels his JD with that instead of his lifeforce. Issei forgoes the form entirely in favor of creating Cardinal Crimson Promotion, an exhausting but near-equal power boost that relies on his link to Rias, befitting his role as TheChampion.]]
* In both ''Manga/GetterRobo G'' and its {{expy}} ''Anime/{{Gekiganger 3}}'', the Shine Spark and the Gekigan Flare is considered this. This is because are forbidden, as the three pilots have to hit a switch ''at the same time'' to activate the attack or risk destroying the robot.



* In the Marvel universe, there exists a weapon called the Ultimate Nullifier which can RetGone anyone or anything the user chooses. '''''But''''' if the target isn't visualized perfectly by the user, then ''the user'' is the one who gets erased. This is possibly the only weapon that can truly defeat ComicBook/{{Galactus}}. (''Possibly''. He is known to be afraid of it, at least. Whether any mortal would actually be capable of perfectly visualizing Galactus is dubious.)
* The "Demon Ball" technique in ''BowlingKing''; Its creator injured himself badly attempting to perfect it and was forced to retire from professional bowling.

to:

* In the Marvel universe, there exists a weapon called the Ultimate Nullifier which can RetGone anyone or anything the user chooses. '''''But''''' But if the user doesn't visualize the target isn't visualized perfectly by the user, properly, then ''the user'' is the one who gets erased. This is possibly the only weapon that can truly defeat ComicBook/{{Galactus}}. (''Possibly''.(Possibly. He is known to be afraid of it, at least. Whether any mortal would actually be capable of perfectly visualizing Galactus is dubious.)
* The "Demon Ball" technique in ''BowlingKing''; ''BowlingKing''. Its creator injured himself badly attempting to perfect it and was forced to retire from professional bowling.



* In ''Fanfic/{{Pokeumans}}'', [[SpiritAdvisor Spiritus]] reveals to Brandon that as an Energy Channeller he may be able to perform Total Absorption - which would consume the enemy's aura (and by default, [[ThouShaltNotKill is totally fatal]]) and [[WithGreatPowerComesGreatInsanity may even take a hit on his sanity]] to the point of unleashing a SuperpoweredEvilSide.

to:

* In ''Fanfic/{{Pokeumans}}'', ''Fanfic/{{Pokeumans}}'':
**
[[SpiritAdvisor Spiritus]] reveals to Brandon that as an Energy Channeller he may be able to perform Total Absorption - which would consume the enemy's aura (and by default, [[ThouShaltNotKill is totally fatal]]) and [[WithGreatPowerComesGreatInsanity may even take a hit on his sanity]] to the point of unleashing a SuperpoweredEvilSide.



* Parodied in a ''Fanfic/JusticeSocietyOfJapan'' omake, where [[DragonBallZ Mr. Satan]] and [[StreetFighter Dan Hibiki]] both claim to know one of these, but are both to scared to actually perform it.
* ''FanFic/TheLegendOfCynderSeries'': Myst's fury, after she takes a potion to help cure her blindness. The potion has a side effect of drastically increasing a dragon's powers the more they've drunken, of which Myst needed to drink a whole buckets worth in order to purge The General's poison that was blinding her out of her body. It's heavily implied that Myst's fury would be one of the single most powerful attacks in the entire fic series... However, it would have the unfortunate side effect of [[spoiler: killing her]] if she were to release that much power at once. As such, she has never once used it so far.
* In ''[[FanFic/SovereignGFCOrigins Origins]]'', a ''MassEffect''[=/=]''StarWars''[[spoiler:[=/=]''[=Borderlands=]''[=/=]''[=Halo=]'']] MassiveMultiplayerCrossover, Dr. Kevin Filner comes up with something that's considered this. In order to fight [[spoiler:the Flood]] the heroes need ships that don't have crews. Unfortunately, all the power sources that have been used for various warships so far are either inadequate or run on some form of {{Unobtainium}} like hypermatter. Consequently, he suggests using biotic batteries...like a certain [[HeelFaceTurn villain-turned-at-least-nonthreatening]]--Sarah. He repeatedly lampshades how much trouble he will be in for suggesting such a thing, and considering these are [[MamaBear Jack's]] students we're talking about, he's probably right.

to:

* Parodied in a ''Fanfic/JusticeSocietyOfJapan'' omake, where [[DragonBallZ Mr. Satan]] and [[StreetFighter Dan Hibiki]] both claim to know one of these, but are both to too scared to actually perform it.
* ''FanFic/TheLegendOfCynderSeries'': Myst's fury, after she takes a potion to help cure her blindness. The potion has a side effect of drastically increasing a dragon's powers the more they've drunken, of which they drink; Myst needed to drink a whole buckets bucket's worth in order to purge The General's poison that was blinding her out of her body. It's heavily implied that Myst's fury would be one of the single most powerful attacks in the entire fic series... series. However, it would have the unfortunate side effect of [[spoiler: killing her]] her if she were to release that much power at once. As such, she has never once used it so far.
* In ''[[FanFic/SovereignGFCOrigins Origins]]'', a ''MassEffect''[=/=]''StarWars''[[spoiler:[=/=]''[=Borderlands=]''[=/=]''[=Halo=]'']] MassiveMultiplayerCrossover, Dr. Kevin Filner comes up with something that's considered this.one. In order to fight [[spoiler:the Flood]] the heroes need ships that don't have crews. Unfortunately, all the power sources that have been used for various warships so far are either inadequate or run on some form of {{Unobtainium}} like hypermatter. Consequently, he suggests using biotic batteries...batteries, like a certain [[HeelFaceTurn villain-turned-at-least-nonthreatening]]--Sarah.villain-turned-at-least-nonthreatening]] -- Sarah. He repeatedly lampshades how much trouble he will be in for suggesting such a thing, and considering these are [[MamaBear Jack's]] students we're talking about, he's probably right.



* The entire point of TheDarkSide in ''Franchise/StarWars''.
** Per [[AllThereInTheManual The Expanded Universe]], the lightsaber form [[AxCrazy Juyo/Vaapad]], which is the most powerful of them all but [[PowerAtAPrice relies on the heavy use of aggression]]. For that reason, it's forbidden to most Jedi except those who demonstrate they're capable of handling it safely (eg. [[BadAss Mace Windu]] and [[{{Badass}} Depa Bilaba]] Mace's own apprentice who was even ''better'' at Vaapad than he was). Which is to say, handling it without slipping to the Dark Side. According to Palpatine's ExpandedUniverse commentary, this should come as no surprise because Juyo is actually a Sith fighting style.
* In ''Film/KissOfTheDragon'', JetLi describes the titular technique as "very secret, very forbidden". (Though that technique actually poses no danger to the user. It is forbidden because of its effect on the target.)
* In ''Film/BladesOfGlory'', the Iron Lotus is a technique developed by the coach in his "wild youth", but only one country was crazy enough to try it - North Korea. The only attempt resulted in the woman's head cut off by the man's ice skate (as impossible as this sounds). According to the coach, the only way for the technique to be performed successfully is by a pair of two men.

to:

* The entire point of TheDarkSide in ''Franchise/StarWars''.
** Per
''Franchise/StarWars''. [[AllThereInTheManual The Expanded Universe]], Universe]] defines the most powerful lightsaber form as [[AxCrazy Juyo/Vaapad]], a Sith technique which is the most powerful of them all but [[PowerAtAPrice relies on the heavy use of aggression]]. For that reason, it's forbidden to most Jedi except those who demonstrate they're capable of handling it safely (eg. [[BadAss Mace Windu]] and [[{{Badass}} Depa Bilaba]] Mace's own apprentice who was even ''better'' at Vaapad than he was). Which is to say, handling it -- ''i.e.'', without slipping to the Dark Side. According to Palpatine's ExpandedUniverse commentary, this should come as no surprise because Juyo is actually a Sith fighting style.
Side.
* In ''Film/KissOfTheDragon'', JetLi describes the titular technique as "very secret, very forbidden". (Though that The technique actually poses no danger to the user. It user; it is forbidden because of its effect on the target.)
target.
* In ''Film/BladesOfGlory'', the Iron Lotus is a technique developed by the coach in his "wild youth", but only one country was crazy enough to try it - -- North Korea. The only attempt resulted in the woman's head cut off by the man's ice skate (as impossible as this sounds). According to the coach, the only way for the technique to be performed successfully is by a pair of two men.



* ''Film/{{Ghostbusters 1984}}'': "Don't cross the streams!" The Proton Packs fire a Proton Stream, which can snag a ghost like a lasso. However, the device is very unstable and, if the Proton Streams met, it would cause a total protonic reversal, leading to all life coming to an end simultaneously and every molecule in the user's body to explode at the speed of light. [[spoiler:They're forced to use it to end Gozer's threat at the end of the first movie. Thankfully, all it does is cause a big boom and cover New York in marshmallow.]]
* Going beyond subatomic size in ''Film/AntMan'', which can only be accomplished by disabling the suit's regulator, which means you aren't coming back once you do. [[spoiler:Scott finds a way to do it, though, albeit requiring a specific setup]].

to:

* ''Film/{{Ghostbusters 1984}}'': "Don't cross the streams!" The Proton Packs fire a Proton Stream, stream which can snag a ghost like a lasso. However, But the device is very unstable and, unstable, and if the Proton Streams proton streams met, it would cause a total "total protonic reversal, reversal", leading to all life coming to an end simultaneously and every molecule in the user's body to explode at the speed of light. [[spoiler:They're forced to use it to end Gozer's threat at the end of the first movie. Thankfully, all it does is cause a big boom and cover New York in marshmallow.]]
* Going beyond subatomic size in In ''Film/AntMan'', which going beyond subatomic size can only be accomplished by disabling the suit's regulator, which means you aren't coming back once you do. [[spoiler:Scott finds a way to do it, though, albeit requiring a specific setup]].



* Death magic in LoisMcMasterBujold's ''Literature/{{Chalion}}'' series causes both the target and the caster to die as their souls are borne off to the Bastard's Hell (when it works at all). Luckily for some so affected, not only is the Bastard's Hell more of AHellOfATime than a FireAndBrimstoneHell, but they don't always stay there, as some of the other gods may take them up. Not to mention that unsuccessful attempts/research are regarded as attempted murder at best and dealt with by temporal authorities as such.
** Of course, ''successful'' attempts at death magic are considered divine intervention, and not prosecutable under criminal law. This is a bit of a semantic point, since if successful there's usually nobody left to prosecute. Usually.
* The use of "balefire" in Robert Jordan's ''Literature/TheWheelOfTime'' is forbidden by the magic users of the world, and when people use it anyway, they're exceedingly careful with it - because balefire doesn't just obliterate its target, it [[RetGone goes back in time]] to do so, with all the potential paradox that implies. Entire cities and their recent histories disappeared from the face of the earth before the mages, good ''and'' evil, decided that maybe gratuitous use of balefire wasn't such a good idea... When Rand begins using it for more than minute uses it is seen as a sign of his rapidly deteriorating mental state impacting his judgement, though he is technically correct that balefire is the only way to ensure enemies such as the Forsaken are not ressurected by the Dark One.
** It wasn't just the cities disappearing that almost broke reality, but also having them reappear again as the destroyers were killed with balefire, and then having them vanish ''again'' if the person who did that ''also'' got killed with balefire. (Though Robert Jordan waffled on this a bit, at one point saying that the effects of balefire couldn't be undone by more balefire.)
** Picking apart a weave of the One Power rather than leaving it to dissipate is a DangerousForbiddenTechnique among the Aes Sedai, and just a bloody dangerous technique among the Aiel Wise Ones. If executed perfectly it won't leave a telltale "residue," which normally lets one channeler see exactly what another has done, but failure is extremely easy and can produce a range of consequences. [[spoiler:When Elayne tries and fails, it produces a burst of wind. A burst of wind with the force of a small nuclear explosion.]]
*** And a lasting "fallout" effect that makes it difficult to cast spells in the entire region for a year or more.
* Creator/MercedesLackey's ''[[Literature/HeraldsOfValdemar Last Herald Mage]]'' trilogy mentions the "Final Strike", in which a mage uses up all his energy in an offensive spell, thus killing himself along with whatever is aimed at. It works, too, in the [[DownerEnding tragic]] ending of the trilogy.
** It's also mentioned many other times in her other Valdemar works, and used at least once more on a very powerful scale. Where [[spoiler: Vanyel's already massive power results in a Final Strike that is so literally earth-shaking that the geography of northern Valdemar is forever altered]], in the Owl Knight trilogy [[spoiler: poor old almost-powerless Wizard Justyn must expend his Final Strike to destroy the single bridge that stands between a marauding barbarian tribe and his fleeing village]]. In its own way, it's just as much a DyingMomentOfAwesome.
* Literature/HarryPotter
** Spells such as the Unforgivable Curses and Fiendfyre. Using any one of them can get you a life sentence because of their cruelty and also their emotion-driven nature.

to:

* Death magic in LoisMcMasterBujold's ''Literature/{{Chalion}}'' series causes both the target and the caster to die as their souls are borne off to the Bastard's Hell (when it works at all). Luckily for some so affected, not only is the Bastard's Hell more of AHellOfATime than a FireAndBrimstoneHell, but they don't always stay there, as some of the other gods may take them up. Not to mention that This also means while unsuccessful attempts/research attempts or research are regarded as attempted murder at best (at least) and dealt with by temporal authorities as such.
** Of course,
such, ''successful'' attempts at death magic are not prosecutable -- not only because there's nobody left to prosecute, but also because if it works, it's considered divine intervention, and not prosecutable under criminal law. This is a bit of a semantic point, since if successful there's usually nobody left to prosecute. Usually.
intervention.
* Robert Jordan's ''Literature/TheWheelOfTime''
**
The use of "balefire" in Robert Jordan's ''Literature/TheWheelOfTime'' is forbidden by the magic users of the world, and when people use it anyway, they're exceedingly careful with it - because balefire it. Balefire doesn't just obliterate its target, it [[RetGone goes back in time]] to do so, with all the potential paradox paradoxes that implies. Entire cities and their recent histories disappeared from the face of the earth before the mages, good ''and'' evil, decided that maybe gratuitous use of balefire wasn't such a good idea... idea. When Rand begins using it for more than minute uses a minute, it is seen as a sign of his rapidly deteriorating mental state impacting his judgement, though he is technically correct that balefire is the only way to ensure enemies such as the Forsaken are not ressurected by the Dark One.
** It wasn't just the cities disappearing that almost broke reality, but also having them reappear again as the destroyers were killed with balefire, and then having them vanish ''again'' if the person who did that ''also'' got killed with balefire. (Though Robert Jordan waffled on this a bit, at one point saying that the effects of balefire couldn't be undone by more balefire.)
** Picking apart a weave of the One Power rather than leaving it to dissipate is a DangerousForbiddenTechnique among the Aes Sedai, and just a bloody dangerous technique among the Aiel Wise Ones. If executed perfectly perfectly, it won't leave a telltale "residue," "residue", which normally lets one channeler see exactly what another has done, but failure is extremely easy and can produce a range of consequences.consequences, including a lasting "fallout" effect that makes it difficult to cast spells in the entire region for a year or more. [[spoiler:When Elayne tries and fails, it produces a burst of wind. A burst of wind with the force of a small nuclear explosion.]]
*** And a lasting "fallout" effect that makes it difficult to cast spells in the entire region for a year or more.
]]
* Creator/MercedesLackey's ''[[Literature/HeraldsOfValdemar Last Herald Mage]]'' trilogy mentions ''Literature/HeraldsOfValdemar'' has the "Final Strike", in which a mage uses up all his energy in an offensive spell, thus killing himself along with whatever is aimed at. It works, too, in the [[DownerEnding tragic]] ending of the trilogy.
** It's also mentioned many other times
''Last Herald Mage'' trilogy. Elsewhere in her other Valdemar works, and used at least once more on a very powerful scale. Where ''Valdemar'', [[spoiler: Vanyel's already massive power results in a Final Strike that is so literally earth-shaking that the geography of northern Valdemar is forever altered]], and in the Owl Knight ''Owl Knight'' trilogy [[spoiler: poor old almost-powerless Wizard Justyn must expend his Final Strike to destroy the single bridge that stands between a marauding barbarian tribe and his fleeing village]]. In its own way, it's just as much a DyingMomentOfAwesome.
village]].
* Literature/HarryPotter
From the ''Literature/HarryPotter'' series:
** Spells such A set of three spells is known as the Unforgivable Curses and Fiendfyre. Using any one of them can get you a "Unforgivable Curses"; their use lands an automatic life sentence because of in Azkaban. This is mostly due to their cruelty power; one {{brainwash|ing}}es, one [[ColdBloodedTorture tortures]], and also one just [[OneHitKill kills]]. It's impossible to use them without really, truly wanting the consequences, meaning that their emotion-driven nature. use proves the user's malice.



* Literature/ThePendragonAdventure: It turns out that [[spoiler: all Travelers can warp reality like [[BigBad Saint Dane]] can, but doing so drains the life force of [[{{Heaven}} Solara]]. Saint Dane avoids these drawbacks by relying on a warped version of Solara based on darkness.]]

to:

* Literature/ThePendragonAdventure: ''Literature/ThePendragonAdventure'': It turns out that [[spoiler: all Travelers can warp reality like [[BigBad Saint Dane]] can, but doing so drains the life force of [[{{Heaven}} Solara]]. Saint Dane avoids these drawbacks by relying on a warped version of Solara based on darkness.]]



* The ''{{Dragaera}}'' series has "Elder Sorcery", which involves the direct manipulation of raw chaos, and the practice of which is a capital crime by imperial edict. Those who research and practice it do so mainly out of curiosity and/or for the search for knowledge, since elder sorcery has long since been supplanted by the ''much'' safer and easier use "normal" sorcery, where the energy of raw chaos is first filtered through the Imperial Orb before being used. However, there are some circumstances where normal sorcery doesn't work, forcing the characters to resort to elder sorcery.

to:

* The ''{{Dragaera}}'' series has "Elder Sorcery", which involves the direct manipulation of raw chaos, and the practice of which is a capital crime by imperial edict. Those who research and practice it do so mainly out of curiosity and/or for or the search for knowledge, since elder sorcery has long since been supplanted by the ''much'' safer and easier use "normal" sorcery, where the energy of raw chaos is first filtered through the Imperial Orb before being used. However, there are some circumstances where normal sorcery doesn't work, forcing the characters to resort to elder sorcery.



** Hellfire, which is demonic power that enhances spells but only available when your soul is corrupted by a Fallen Angel. Soulfire, Hellfire's divine counterpart, uses the stuff that composes your ''soul'' as the power source. Use too much Soulfire, and your soul literally evaporates into your spells, killing you (and maybe then some).

to:

** Hellfire, which is demonic power that enhances spells but only available when your soul is corrupted by a Fallen Angel. Soulfire, Hellfire's divine counterpart, uses the stuff that composes comprises your ''soul'' as the power source. Use too much Soulfire, and your soul literally evaporates into your spells, killing you (and maybe then some).



* In ''Literature/{{Pact}}'', summoning a demon is actually spectacularly easy--all you need to do is state their name a certain number of times, and they will come. Of course, there's nothing preventing said demon from immediately inflicting a FateWorseThanDeath upon you if you don't take extensive precautions, and even if ''you'' are protected, a demon is defined by its pure hatred for existence itself, and summoning one will diminish the world as a whole--candles get a little less bright, gasoline lasts a little less long, and people are a little bit worse to one another. [[CrapsackWorld There's no known way of reclaiming what the demons have already taken from the world]]. In some cases, [[RetGone there's no way of knowing what was taken]].

to:

* In ''Literature/{{Pact}}'', summoning a demon is actually spectacularly easy--all easy -- all you need to do is state their name a certain number of times, and they will come. Of course, there's nothing preventing said demon from immediately inflicting a FateWorseThanDeath upon you if you don't take extensive precautions, and even if ''you'' are protected, a demon is defined by its pure hatred for existence itself, and summoning one will diminish the world as a whole--candles get a little less bright, gasoline lasts a little less long, and people are a little bit worse to one another. [[CrapsackWorld There's no known way of reclaiming what the demons have already taken from the world]]. In some cases, [[RetGone there's no way of knowing what was taken]].
6th Jun '16 11:22:10 AM Elyandarin
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Compare DeadlyUpgrade, CastFromHitPoints, CastFromLifespan, SacrificialRevivalSpell, DeathOrGloryAttack. If they constantly survive these it's a case of IThoughtItWasForbidden. See also GodzillaThreshold and LethalHarmlessPowers.

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Compare DeadlyUpgrade, CastFromHitPoints, CastFromLifespan, CastFromExperiencePoints, SacrificialRevivalSpell, DeathOrGloryAttack. If they constantly survive these it's a case of IThoughtItWasForbidden. See also GodzillaThreshold and LethalHarmlessPowers.
4th Jun '16 4:30:26 PM GoldenKeyblade
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* ''TabletopGame/DemonTheDecent'' features a technique called "Going Loud". In simple terms this transforms your character into their demonic form, sets your magic [[PowerLevel Power Level]] (called Primum) to 10 (out of a maximum of 10) completely refills your Mana (And having maxed Primum means you are able to hold LOTS of Mana) and allows you access to basically ALL of the magic spells in the game. The catch? Well the whole point of this game is that Demons need to impersonate a human in order to avoid the attention of the games BigBad. The human identity they adopt is called their "cover" (in the espionage sense of it being a cover identity). Going Loud irrecoverably destroys that cover, effectively erasing every detail of it from existence, which means that the Big Bad knows ''exactly'' where you are...

to:

* ''TabletopGame/DemonTheDecent'' ''TabletopGame/DemonTheDescent'' features a technique called "Going Loud". In simple terms this transforms your character into their demonic form, sets your magic [[PowerLevel Power Level]] (called Primum) to 10 (out of a maximum of 10) completely refills your Mana (And having maxed Primum means you are able to hold LOTS of Mana) and allows you access to basically ALL of the magic spells in the game. The catch? Well the whole point of this game is that Demons need to impersonate a human in order to avoid the attention of the games BigBad. The human identity they adopt is called their "cover" (in the espionage sense of it being a cover identity). Going Loud irrecoverably destroys that cover, effectively erasing every detail of it from existence, which means that the Big Bad knows ''exactly'' where you are...
4th Jun '16 4:30:00 PM GoldenKeyblade
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** And then there's the move "Struggle," which is a rather weak move that damages the user by 1/4th of it's max HP. Chances are, you're only using it four times before you die.

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** And then there's the move "Struggle," which is a rather weak move that damages the user by 1/4th of it's max HP. Chances are, you're only using it four times before you die. And that's a base case scenario; considering that it's a move that only becomes available when all your other moves are out of PP, odds are it'll do even less than that.
2nd Jun '16 12:16:09 PM DoctorTItanX
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** Finally, there is Edo Tensei, a jutsu that sacrifices a living person to bring another back from the dead as a zombie with unlimited regenerative abilities. It is forbidden both because of being necromancy that's fueled by HumanSacrifice and because it is ridiculously broken - the undead not only regenerate from ashes as long as their soul is in place, allowing them to spam their own dangerous forbidden techniques with impunity, but since the chakra reserve is tied to physical stamina, the regeneration also keeps replenishing their energy. When it is used to its full potential by [[spoiler: Kabuto]], the resulting BossRush takes thousands of ninjas to stop.

to:

** Finally, there is Edo Tensei, a jutsu that sacrifices a living person to bring another back from the dead as a zombie with unlimited regenerative abilities. It is forbidden both because of being necromancy that's fueled by HumanSacrifice and because it is ridiculously broken extremely effective - the undead not only regenerate from ashes as long as their soul is in place, allowing them to spam reuse their own dangerous forbidden techniques with impunity, but since the chakra reserve is tied to physical stamina, the regeneration also keeps replenishing their energy. When it is used to its full potential by [[spoiler: Kabuto]], the resulting BossRush takes thousands of ninjas to stop.



*** A character is ultimately shown using all eight gates, and the resulting physical prowess not only surpasses that of all the characters known when the technique was first introduced, it surpasses that of even [[spoiler:[[PhysicalGod Madara Uchiha, who was hosting the Juubi to boot]]]]. After his final attack, his body is so overheated it starts dissolving into ash while he's still alive. [[spoiler: Naruto is able to prevent this, but Gai is shown to be in a wheelchair years later.]]

to:

*** A character is ultimately shown using all eight gates, and the resulting physical prowess not only surpasses that of all the characters known when the technique was first introduced, it surpasses that of even [[spoiler:[[PhysicalGod Madara Uchiha, who was hosting the Juubi to boot]]]]. After his final attack, his body is so overheated it starts dissolving into ash while he's still alive. [[spoiler: Naruto is able to prevent this, but Gai Guy is shown to be in a wheelchair years later.]]



** Ichigo's fight with Byakuya woke up his [[SuperPoweredEvilSide inner hollow]] enough for it to want to begin taking over his soul. The more he used his power, the stronger the Hollow became. He eventually learned how to master the hollow which increased his power in battle. However, it could still take over when he was very close to death, resulting in a truly ghastly outcome for everyone involved. [[spoiler: Only when he learned Final Getsuga Tenshou, which was another example of this trope that destroyed his power after use, was his Hollow fully mastered, and only after he learned the truth about his birth ''and'' how the Hollow was ''his true Zanpakutou'' was he able to face the full truth of his power and accept his Hollow as his true Asauchi.]]

to:

** Ichigo's fight with Byakuya woke up his [[SuperPoweredEvilSide inner hollow]] Hollow]] enough for it to want to begin taking over his soul. The more he used his power, the stronger the Hollow became. He eventually learned how to master the hollow which increased his power in battle. However, it could still take over when he was very close to death, resulting in a truly ghastly outcome for everyone involved. [[spoiler: Only when he learned Final Getsuga Tenshou, which was another example of this trope that destroyed his power after use, was his Hollow fully mastered, and only after he learned the truth about his birth ''and'' how the Hollow was ''his true Zanpakutou'' was he able to face the full truth of his power and accept his Hollow as his true Asauchi.]]
2nd Jun '16 12:01:40 PM DoctorTItanX
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* ''Manga/{{Naruto}}'' has lots and lots and lots of these. In fact, there exists a specific subset of the Shinobi arts called 'Kinjutsu', literally "Forbidden Techniques". For one reason or another they have been banned from being taught, used, or both by the commanding shinobi. They are either jutsu that damage the user to a fatal extent (e.g. Mass Shadow Clone Technique: Each Shadowclone takes a portion of the shinobi's chakra for himself. Make too many Shadowclones, and the original will probably die from exhaustion), jutsu that are viewed as ethically wrong (such as Edo Tensei which resurrects the dead) or jutsu which involve other crimes (e.g. murder in case of the "Edo Tensei," because a HumanSacrifice is needed to resurrect someone). There also exists a wide range of techniques that are not officially 'kinjutsu' but fit this trope.

to:

* ''Manga/{{Naruto}}'' has lots and lots and lots many of these. In fact, there exists a specific subset of the Shinobi arts called 'Kinjutsu', literally "Forbidden Techniques". For one reason or another they have been banned from being taught, used, or both by the commanding shinobi. They are either jutsu that damage the user to a fatal extent (e.g. Mass Shadow Clone Technique: Each Shadowclone takes a portion of the shinobi's chakra for himself. himself/herself. Make too many Shadowclones, Shadow Clones, and the original will probably die from exhaustion), jutsu that are viewed as ethically wrong (such as Edo Tensei which resurrects the dead) or jutsu which involve other crimes (e.g. murder in case of the "Edo Tensei," because a HumanSacrifice is needed to resurrect someone). There also exists a wide range of techniques that are not officially 'kinjutsu' 'kinjutsu', but fit this trope.



** Ichigo's fight with Byakuya woke up his [[SuperPoweredEvilSide inner hollow]] enough for it to want to begin taking over his soul. The more he used his power, the stronger the hollow became. He eventually learned how to master the hollow which increased his power in battle. However, it could still take over when he was very close to death, resulting in a truly ghastly outcome for everyone involved. [[spoiler: Only when he learned Final Getsuga Tenshou, which was another example of this trope that destroyed his power after use, was his hollow fully mastered, and only after he learned the truth about his birth ''and'' how the Hollow was ''his true Zanpakutou'' was he able to face the full truth of his power and accept his hollow as his true asauchi.]]
** In his battle with [[MadScientist Mayuri]], Uryuu activated [[OneWingedAngel Letzt Stil]], considered the last resort of the Quincy. His [[OldMaster grandfather]] had taught Uryuu the technique with the stipulation that [[YouAreNotReady he should never use it]] until he found something he was willing to give up his power to protect. Uryuu chose to use the technique prematurely and [[BroughtDownToBadass lost all his spiritual powers]]. His father [[ParentExMachina Ryuuken]] turned out to have an even MORE forbidden technique that could restore Uryuu's powers but it was a very brutal process. [[spoiler:In the Final Arc, we learn that there is a way to obtain Letzt Stil powers without the one-time-only drawback...but it is forbidden to traditionalists like the Ishidas as unethical.]]
** Certain [[FunctionalMagic Kidou]] is classified as forbidden. Tessai was exiled with Urahara for using forbidden kidou that manipulated space-time. Yamamoto also used a forbidden sacrificial kidou; he sacrificed his left arm to create a massive pillar of fire in an attempt to kill Aizen, and as atonement he never re-grew his arm.
** Captain Komamura's clan has the Human Transformation Technique, which turns them from anthropomorphic wolves into full humans with a power boost. [[spoiler: It requires giving up your human heart, and when the technique runs out, leaves the user as a full non-anthropomorphic wolf]].
* Towards the end of the Chimera Ant arc of ''HunterXHunter'', [[spoiler: Gon forced himself to grow by shortening his lifespan, using all his inborn talent to reach the power that rivals the King of Ants (strongest character as of now), with the possibility of never being able to use nen ever again (and having lifespan shortened)]]

to:

** Ichigo's fight with Byakuya woke up his [[SuperPoweredEvilSide inner hollow]] enough for it to want to begin taking over his soul. The more he used his power, the stronger the hollow Hollow became. He eventually learned how to master the hollow which increased his power in battle. However, it could still take over when he was very close to death, resulting in a truly ghastly outcome for everyone involved. [[spoiler: Only when he learned Final Getsuga Tenshou, which was another example of this trope that destroyed his power after use, was his hollow Hollow fully mastered, and only after he learned the truth about his birth ''and'' how the Hollow was ''his true Zanpakutou'' was he able to face the full truth of his power and accept his hollow Hollow as his true asauchi.Asauchi.]]
** In his battle with [[MadScientist Mayuri]], Uryuu activated [[OneWingedAngel Letzt Stil]], considered the last resort of the Quincy. His [[OldMaster grandfather]] had taught Uryuu the technique with the stipulation that [[YouAreNotReady he should never use it]] until he found something he was willing to give up his power to protect. Uryuu chose to use the technique prematurely and [[BroughtDownToBadass lost all his spiritual powers]]. His father [[ParentExMachina Ryuuken]] turned out to have an even MORE forbidden technique that could restore Uryuu's powers but it was a very brutal process. [[spoiler:In the Final Arc, Thousand Year Blood War, we learn that there is a way to obtain Letzt Stil powers without the one-time-only drawback...but it is forbidden to traditionalists like the Ishidas as unethical.]]
** Certain [[FunctionalMagic Kidou]] is classified as forbidden. Tessai was exiled with Urahara for using forbidden kidou that manipulated space-time. Yamamoto also used a forbidden sacrificial kidou; he sacrificed his left arm to create a massive pillar of fire in an attempt to kill Aizen, and as atonement atonement, he never re-grew his arm.
** Captain Komamura's clan has the Human Transformation Technique, which turns them from anthropomorphic wolves into full humans with a power boost. [[spoiler: It requires literally giving up your human heart, and when the technique runs out, leaves the user as a full non-anthropomorphic wolf]].
* Towards the end of the Chimera Ant arc of ''HunterXHunter'', [[spoiler: Gon forced himself to grow by shortening his lifespan, using all his inborn talent to reach the power that rivals the King of Ants (strongest character being as of now), with the possibility of never being able to use nen ever again (and having lifespan shortened)]]shortened)]].
1st Jun '16 9:45:29 PM GoldenKeyblade
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http://tvtropes.org/pmwiki/article_history.php?article=Main.DangerousForbiddenTechnique