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%% When listing examples below, remember that THIS TROPE IS A TYPE OF PHLEBOTINUM, and thus a SUBSTANCE or TECHNOLOGY.
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%% THIS TROPE IS NOT THE MORAL LESSON. Examples listing only the moral lesson and not the Phlebotinum will be deleted.
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A form of {{phlebotinum}} with a moral component which exists only so that the author can build [[AnAesop a moral lesson]] out of it. As a type of {{Phlebotinum}}, this is only for the substance or technology providing a vehicle for AnAesop.

Compare PoweredByAForsakenChild as these tropes sometimes overlap. May or may not turn into a FantasticAesop. Can result in a PhlebotinumMuncher or MarySuetopia.
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!!Examples

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[[folder:Anime & Manga]]
* In ''Manga/DragonBall'' Goku's rideable cloud can only be ridden on by the pure of heart. Everyone else falls right through, including the perverted Master Roshi who gives Goku the cloud.
* In ''Anime/SoukouNoStrain'' [[spoiler:the Strains are derived from research done on aliens that look exactly like [[{{Anvilicious}} little human girls]] and the research is supposed to continue ([[WhatHappenedToTheMouse though they don't really finish that plot thread]]) so they can achieve instantaneous communication and more with the further dissection and possible brain removal of said girls.]] [[DefectorFromDecadence Naturally, the bad guy didn't like this.]] [[FreakOut So]] [[FaceHeelTurn he decided]] [[OmnicidalManiac it would be best]] [[KillEmAll to punish humanity for this.]]
* In ''{{Inuyasha}}'', both Inuyasha's Tessaiga and Sesshomaru's Tenseiga were crafted specifically for them by their father to be aesoptinum. Tessaiga, the sword of destruction, has the power to kill one hundred demons with one swing, but only if it's wielded by a half-demon for the purpose of protecting humans. Tenseiga, the sword of healing, has the power to revive the dead but cannot harm anyone (except "minions of the underworld" which are basically a type of grim reaper like creatures). The swords are also [[EmpathicWeapon empathic weapons]], and have been known to guide their respective owners from time to time.
* An episode of ''LightNovel/KyoKaraMaoh'' involved a mountain covered by a ghostly miasma that would infect people and cause them to stop trusting anyone. The only one unaffected was the kid hero Yuuri, who had previously decided to never doubt anyone.
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[[folder:Comic Books]]
* In the MarvelComics ''EarthX'', the Cosmic Consciousness grants omniscience, but due to a strange form of observer effect will slowly make those who have even a fraction of it kinder people.
* The ''Comicbook/THUNDERAgents''' Menthor helmet gives its user telepathy, which lets Janus see [[RousseauWasRight the good in others]] and become more empathetic, leading him to [[HeelFaceTurn turn from evil to good]].
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[[folder:Film]]
* In ''Film/{{Serenity}}'', the chemical "Pax" was created by the Alliance to sedate the populace. In case that wasn't objectionable enough to the audience, its first wide-spread test failed spectacularly, resulting in [[spoiler: nearly the entire population of a planet developing severe amotivational disorder and simply sitting quietly until they starved to death. The survivors were rendered insane and horrifically violent, becoming the Reavers.]]
* The movie world of ''Film/LogansRun'' is [[{{Utopia}} utopic]] (i.e. no hunger, no want or need to work). The catch? Everything is run by a [[MasterComputer Computer]]; children 0-7 years are raised in tubes; youth 7-14 are set to run wild, and once you become 30 a gem on your palm (or Life Crystal) turns black and you're sent to compete to be "Renewed". Unfortunately, Renewal is something the citizens made up--the computer never actually ''says'' anything about Renewal and [[spoiler:Box is confused by what Logan means by "Sanctuary."]] Everyone participating in the competition dies.
* The drug Prozium in ''{{Equilibrium}}'' subdues emotions to prevent such things as violence and war. This is helped along by the banning of anything with an Emotional Content rating of ten, which can include anything even remotely artistic, and anyone caught with such contraband is burned alive (or shot repeatedly if they try to make things difficult). Naturally, there's an underground resistance [[spoiler: that the main character eventually champions after he stops taking his meds]].
* In ''Franchise/GhostInTheShell Innocence'', [[spoiler:the gynoids' sentience is due to their containing copies of the ghosts of abducted preteen girls. The ghost-copying procedure eventually kills the girls. Even more disturbingly, they were first brainwashed into near-robots so that the gynoids wouldn't be ''too'' human-like - and that they were intended to be [[{{Sexbot}} Sexbots]]. Despite all this, a surviving girl and her rescuer are actually chastised by the heroine, as she says that [[WhatMeasureIsANonHuman the real victims were the robots]].]]
* ''Film/PiratesOfTheCaribbean: On Stranger Tides'' has a fountain of youth [[spoiler:that requires a human sacrifice to work.]]
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[[folder:Literature]]
* Truffula Trees, the ones for which ''Literature/TheLorax'' speaks. They're used for making thneeds.
* The central premise of Creator/UrsulaKLeGuin's short story "The Ones Who Walk Away from Omelas" was a city whose [[UtopiaJustifiesTheMeans happiness depended]] upon the [[PoweredByAForsakenChild suffering of one innocent child]].
* A similar idea is posed as a philosophical question by Ivan to Alyosha in ''Literature/TheBrothersKaramazov''
* Subtly parodied (along with {{phlebotinum}} in general) in the novel ''Literature/GenerationDead'', as the proposals by scientists to "explain" the whole "teenagers suddenly coming back as zombies" phenomenon, which are mentioned in asides throughout the book, tend towards this. Choice examples include proposals that it was caused by "too much fast food", "too many FirstPersonShooter games", and -- thanks to the expansion of the book's accompanying CharacterBlog -- "too many generations eating microwaved food". Naturally, ''none'' of them is true.
* Creator/NormanSpinrad's '60s sci-fi novel ''Literature/BugJackBarron'' has an Evil Rich White Man gaining immortality from [[spoiler:[[PoweredByAForsakenChild the glands of irradiated-to-death children]]]], with the one the audience knows about in the book being [[spoiler: African-American]]. Good book, {{anvilicious}} {{Aesop}}.
* Creator/DamonKnight's short story "Rule Golden" has an alien that spreads a special plague which induces tele-empathy. This means that prison guards become depressed from the sadness of their prisoners, somebody that strikes someone else will feel the pain from their blow, and somebody that kills someone else will suddenly drop dead (strangely, this even includes such acts from a distance, such as shooting someone, which just kills the shooter rather than everyone else within the same radius). The ostensible reason the alien does this is to make humans become peaceful before they invent interstellar travel, with a side benefit supposedly being the elimination of hierarchic governments (since "government is force"). For no particular reason, the plague affects all warm-blooded animals, not just humans. This means that all mammals and birds are now effectively vegetarians (unless their prey are insufficiently cuddly-looking), causing the extinction of [[CarnivoreConfusion larger beasts of prey]] all over the world.
* Similarly, Creator/StanislawLem's short story "[[Literature/TheCyberiad Highest Possible Level of Development]]" had a drug, Altruzine, that caused tele-empathy, but the story is much more tongue-in-cheek. The results are still not altruistic, though: a man with a toothache has his painful tooth ripped out by nearby people who don't want to feel the pain, a newlywed couple is nearly mobbed outside their hotel where they consummate the marriage (and criticized on their poor performance), and depressed people are driven from towns rather than treated.
* The Creator/JohnBrunner novel, ''Literature/TheStoneThatNeverCameDown'', centers around an artificial, self-replicating protein (today, it'd be called a prion) that eliminates selective inattention -- the brain ''has'' to make connections between pieces of information that it previously ignored. In addition to an intelligence boost, this bestows automatic empathy, since those infected can no longer disregard the genuine pain that others feel.
* Creator/LarryNiven openly admits to using this trope on occasion. A believer in science, high technology, and nuclear power in specific, in ''Literature/LucifersHammer'' he made the workers at a nuclear power plant heroes who were struggling to keep civilization together. They were fighting against environmental extremist, anti-technology (and very specifically, anti-''nuclear'' technology) cannibal raiders.
* In Khaled Hosseini's ''Literature/TheKiteRunner'', main character Amir writes a short story about a man who discovered a cup. Not just any cup; one that turns tears into pearls. In order to become rich, the man must make himself sad. The story ends tragically with the man crying over his wife's body (whose throat he has just slit to make himself cry) atop a mountain of pearls. This is all subverted when Amir's best friend asks why the man didn't simply cut up some onions instead.
* Robert Sawyer has written several books that feature a technological loss of privacy as leading to a better society. His [[Literature/TheNeanderthalParallax Neanderthal Parallax]] series features a society in which everyone wears a gadget that records everything they do 24/7, storing it in an archive that can only be accessed by the person in question, or by the authorities if they have sufficient cause. Another story features plans sent by aliens. The plans are for a gadget that lets people read each others minds without limit, and it is strongly implied that this will lead to utopia.
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[[folder:Live Action TV]]
* ''Series/StarTrekEnterprise'' also gets in on the act with Trellium-D, used to insulate Enterprise from the harmful effects of the Expanse. Unfortunately it also degrades the neural pathways of Vulcans, causing loss of emotional control. T'Pol starts taking "carefully controlled" doses of Trellium-D in order to loosen up a bit and becomes addicted, permanently damaging her ability to control emotions. She also gets Pa'nar Syndrome, an allegory for AIDS, which also causes a loss of emotional control.
* The crew of the Equinox in ''Series/StarTrekVoyager'' were built up as sympathetic and being more down on their luck than Voyager, when they did a FaceHeelTurn. Any audience sympathy they might have had was destroyed by the discovery that their improved warp drive runs on [[PoweredByAForsakenChild the corpses of sentient aliens]].
* ''Series/BabylonFive'': In "Deathwalker", the Dilgar war criminal Jha'dur develops an anti-aging serum that can be used repeatedly to extend an individual's life indefinitely. The cost? It requires a non-synthesizable ingredient available only in [[PoweredByAForsakenChild other sentients]] (one treatment requires one sentient). Her intention was to disperse the knowledge of the serum to ''start'' genocidal wars as vengeance for her species dying (and to establish that, for all their self-righteous condemnation of the Dilgar, the other races are NotSoDifferent). The Vorlons [[YouAreNotReady take it upon themselves]] to destroy the serum, Deathwalker and her ship to prevent that (and destroy any chance of researching the process to give the younger races true immortality and become rivals of the Vorlons).
* One ''Series/TalesFromTheDarkside'' episode has an old man and his daughter finding a fountain of youth. It is guarded by a Native American-esque spirit who says "You must sacrifice one form of immortality (i.e. your child) for another." The old man sacrifices his daughter, then finds he ages like a rock--veeery slowly, but lives like one--taking years to blink.
* One ''Series/GilligansIsland'' episode involves the castaways finding some seeds that when ingested, bestow on the consumer the ability to read other people's minds. Trouble is, everyone then becomes privy to every tiny little critical thought the others have about them, and the group is unable to stop fighting with each other. Gilligan solves the problem by burning the bush that produces the seeds, leading to the moral "Some things are better left unsaid" --even though [[FantasticAesop no one actually said them]].
* On ''Series/DoctorWho'', if a new substance or technology is discovered, chances are it violates someone's civil rights in ways that will be revealed around mid-episode and require a debate on the ethics of placing the wants of the many over the needs of the few. The most common example is time travel (is it okay to change history?). Other examples have included "flesh" - a substance that can be used to create avatars that allow people to do dangerous tasks without risking their own lives (which, of course, turned out to be alive and capable of sentience); a diet pill that causes human fat to turn into larval aliens (it's the only way for the aliens to reproduce, but has the potential to kill the dieter); and a process that can turn old people into young people (it also makes their DNA unstable causing possible mutation and requiring the youthened person to drain the life from others).
* ''LostInSpace'' had an early episode in which the Robinsons discover an alien machine (in a crashed spaceship) that provides whatever they think of. The machine makes life so easy for the family that some of them stop taking care of things or showing initiative. Then all the goodies start falling apart/not working, and the machine's guardian shows up to take it back into the spaceship.
* Used in the TV series ''Series/TheTomorrowPeople,'' where the main characters' telepathy makes them incapable of killing.
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[[folder:Mythology]]
* The ring of Gyges (a Persian folk tale that was old when Herodotus heard and repeated it) allows the wearer to become invisible. Gyges, freed from the fear of punishment, kills the king and marries the queen, making this one OlderThanFeudalism.

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[[folder:Tabletop Games]]
* ''[[ShockSocialScienceFiction Shock: Social Science Fiction]]'' encourages this in its worldbuilding phase.
* In the ''TabletopGame/DungeonsAndDragons'' ''TabletopGame/DarkSun'' setting, magic use can destroy the environment, killing plants and making the land infertile. Arcanists that choose to draw magic without environmental damage are called preservers.
* The TabletopGame/NewWorldOfDarkness gives us at least two:
** In TabletopGame/WerewolfTheForsaken, spirits are the source of all magical tools, gifts, and powers. However, spirits have their own sometimes-delicate ecosystem, and removing one (to bind it into a tool or simply destroying it because it's dangerous) can have disastrous consequences for other spirits in the area and the things they embody in the real world. Since this is a Green Aesop, sometimes _failing_ to hunt or destroy certain spirits can have similarly terrible effects.
** In TabletopGame/MageTheAwakening souls are a viable power source, as are demons from "the void". You can probably figure out what the issues with tapping either [[MoralEventHorizon tend to be]]. On the plus side: immortality!
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[[folder:Video Games]]
* ''VideoGame/{{Crusader}}: No Regret'' introduces "di-correllium", a substance found mostly on the moon (about half the known deposits are there) and that the entire world energy supply is based around. It's to the point that the cartel charged with mining it murders researchers and suppresses information that could lead to the use of alternative energy sources. (As if that weren't objectionable enough, they use slave labor--mostly political prisoners--to do the mining. Did we mention they have minimal safety equipment and di-cor is extremely radioactive and toxic?) And by the end of the game, the moon and its di-cor is under the control of a group of terrorists.
* ''Videogame/CommandAndConquer'' gives us Tiberium. Without going into too many details, humanity becomes more or less dependent on it even though it's ''completely destroying Earth and all life upon it''. In short, it's the stuff of Al Gore's nightmares.
* Mako in ''Videogame/FinalFantasyVII''. An energy source that is derived by leaching energy from TheLifestream. Usage causes vast expanses of land to be rendered desolate. When humans and animals are overexposed to it, expect a BodyHorror. With the Shinra Electric Power Company's hold on the public media, and everything else, [[ApatheticCitizens no one knows]]. You'd think that they would have noticed that something was wrong the ''first'' time a Mako reactor exploded, but it took an EldritchAbomination alien, an OmnicidalManiac, and a team of {{Well Intentioned Extremist}}s to shake them from their haze. Immediately after Mako fell out of favor, they [[UnfortunateImplications resorted to oil]].
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[[folder:Western Animation]]
* One ''WesternAnimation/{{Ducktales}}'' episode features the titular "Pearl of Wisdom", which will grant whoever holds it at a certain point at sunrise temporary infinite wisdom. ''Every'' person who has ever stolen it and used it in this manner realizes the error of their ways during their "moment of wisdom," and voluntarily returns the pearl to the islanders from whom it was stolen. [[DangerouslyGenreSavvy (This is why the islanders are never bent out of shape whenever the pearl IS stolen -- they know it will eventually be brought back to them.)]]
* ''WesternAnimation/BatmanBeyond'' had "Splicing", a new technology that allowed a human to mix their DNA with that of an [[PettingZooPeople animal]], giving them cool features. [[BlatantLies It's safe, we assure you.]] Naturally, it became an allegorical aesop for drug abuse and extreme body modification.
* ''WesternAnimation/{{Visionaries}}'' had such an example built into the wizard spellbook: the ''Secret Secret Spell.'' Anyone who steals the book and casts it creates what ''appears'' to be TheEndOfTheWorldAsWeKnowIt and finds themselves racing back to the legitimate owner of the book so he can reverse it, restoring things back to normal.
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