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* One of the primary rules for magic in Simon Hawke's ''Literature/TheWizardOf4thStreet'' series, and all but spelled out by Merlin himself in the prequel novel The Wizard of Camelot. You can't get something for nothing with magic, as even the simplest spell requires life energy to fuel. This is the source of conflict for the series as while the heroes use Thaumaturgy and draw on their own life essences for power, the antagonists the Dark Ones use Necromancy and forcibly steal life energy from others for their magic. Also, when Merlin "creates" a feast for an impoverished English family who's hosting him, he states that the raw materials for the food were actually drawn from the surrounding area, i.e. there was a pig nearby to provide ham, a stag for the venison, wild fruits for the pies, etc.

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* One of the primary rules for magic in Simon Hawke's ''Literature/TheWizardOf4thStreet'' ''The Wizard Of 4th Street'' series, and all but spelled out by Merlin himself in the prequel novel The Wizard of Camelot. You can't get something for nothing with magic, as even the simplest spell requires life energy to fuel. This is the source of conflict for the series as while the heroes use Thaumaturgy and draw on their own life essences for power, the antagonists the Dark Ones use Necromancy and forcibly steal life energy from others for their magic. Also, when Merlin "creates" a feast for an impoverished English family who's hosting him, he states that the raw materials for the food were actually drawn from the surrounding area, i.e. there was a pig nearby to provide ham, a stag for the venison, wild fruits for the pies, etc.


* ''WesternAnimation/MiraculousLadybug'': The Ladybug and Cat Miraculous together grant the user the power to alter reality, but as revealed in the episode "Robostus", doing so exacts an equal toll. For example, if [[RobotBuddy Markov]] (the MonsterOfTheWeek of said episode) were to achieve his wish [[PinocchioSyndrome to be human]], another human would lose their humanity. [[spoiler:Were Hawk Moth to succeed in wishing his wife out of her magical coma, someone else would have to take her place.]]

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* ''WesternAnimation/MiraculousLadybug'': The Ladybug and Cat Miraculous together grant the user the power to alter reality, but as revealed in the episode "Robostus", doing so exacts an equal toll. For example, if [[RobotBuddy Markov]] (the MonsterOfTheWeek of said episode) were to achieve his wish [[PinocchioSyndrome to be human]], another human would lose their humanity. [[spoiler:Were [[spoiler:Should [[BigBad Hawk Moth to Moth]] succeed in wishing his wife out of her magical coma, someone else would have to take her place.]]


* ''WesternAnimation/MiraculousLadybug'': The Ladybug and Cat Miraculous together grant the user the power to alter reality, but as revealed in the episode "Robostus", doing so exacts an equal toll. For example, if [[RobotBuddy Markov]] (the MonsterOfTheWeek of said episode) were to achieve his wish [[PinocchioSyndrome to be human]], another human would lose their humanity.

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* ''WesternAnimation/MiraculousLadybug'': The Ladybug and Cat Miraculous together grant the user the power to alter reality, but as revealed in the episode "Robostus", doing so exacts an equal toll. For example, if [[RobotBuddy Markov]] (the MonsterOfTheWeek of said episode) were to achieve his wish [[PinocchioSyndrome to be human]], another human would lose their humanity. [[spoiler:Were Hawk Moth to succeed in wishing his wife out of her magical coma, someone else would have to take her place.]]


* ''Series/TheWitcher2019'': Magic is explained to operate on this principle. If you don't have an external source for power, it will be [[CastFromHitPoints drawn from the caster]].

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* ''Series/TheWitcher2019'': Magic is explained to operate on this principle. If you don't have an external source for power, it will be [[CastFromHitPoints drawn from the caster]]. As demonstrated by one of Yennefer's classmates when her hand withers horrifically after levitating a rock without draining the life from the provided bunch of flowers.

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* ''Series/TheWitcher2019'': Magic is explained to operate on this principle. If you don't have an external source for power, it will be [[CastFromHitPoints drawn from the caster]].


* ''Manga/FullmetalAlchemist'':
** This franchise serves as the {{Trope Namer|s}} for anime and manga, as it makes a big deal out of the principle in its plot. In regards to alchemical transmutation, the law basically works like the Newtonian law of conservation of matter: matter and energy cannot be created or destroyed in a reaction. (It also helps that UsefulNotes/IsaacNewton, one of the {{Trope Codifier}}s in Real Life physics, considered himself an alchemist and formulated the basic principles of this trope.) The energy used to perform Amestrian alchemy comes from either tectonic shifts (the manga and ''Brotherhood'' anime) or [[spoiler:the souls of our world's deceased]] ([[Anime/FullmetalAlchemist the 2003 anime version]]). Xingese [[InsistentTerminology alkahestry]] relies on reading and directing the Earth's natural energy through its mantle.

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* ''Manga/FullmetalAlchemist'':
** This franchise
''Manga/FullmetalAlchemist'' serves as the {{Trope Namer|s}} for anime and manga, as it makes a big deal out of the principle in its plot. plot;
**
In regards to alchemical transmutation, the law basically works like the Newtonian law of conservation of matter: matter and energy cannot be created or destroyed in a reaction. (It also helps that UsefulNotes/IsaacNewton, one of the {{Trope Codifier}}s in Real Life physics, considered himself an alchemist and formulated the basic principles of this trope.) The energy used to perform Amestrian alchemy comes from either tectonic shifts (the manga and ''Brotherhood'' anime) or [[spoiler:the souls of our world's deceased]] ([[Anime/FullmetalAlchemist the 2003 anime version]]). Xingese [[InsistentTerminology alkahestry]] relies on reading and directing the Earth's natural energy through its mantle.


* ''WesternAnimation/MiraculousLadybug'': Combining the ladybug and cat Miraculouses would grant the user the power to alter reality, but as revealed in the episode "Robostus", this comes at a price - for example, if [[AIIsACrapshoot Markov]] (the MonsterOfTheWeek in the episode) were to achieve his wish to be human, another human would lose his humanity.

to:

* ''WesternAnimation/MiraculousLadybug'': Combining the ladybug The Ladybug and cat Miraculouses would Cat Miraculous together grant the user the power to alter reality, but as revealed in the episode "Robostus", this comes at a price - for doing so exacts an equal toll. For example, if [[AIIsACrapshoot [[RobotBuddy Markov]] (the MonsterOfTheWeek in the of said episode) were to achieve his wish [[PinocchioSyndrome to be human, human]], another human would lose his their humanity.


* In ''VideoGame/FinalFantasyXIIRevenantWings'' summoning Yarhi siphons part of your Anima, the part of you that feels, which is why all the Aegyl who regularly use Yarhi to protect them selves for random monsters appear rather emotionless. [[spoiler:Their "god" draining their Anima for himself is a bigger factor in this though.]]

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* In ''VideoGame/FinalFantasyXIIRevenantWings'' summoning Yarhi siphons part of your Anima, the part of you that feels, which feels. This is why all the Aegyl who regularly use Yarhi to protect them selves for themselves from random monsters appear rather emotionless. [[spoiler:Their "god" draining their Anima for himself is a bigger factor in this this, though.]]


[[quoteright:350:[[Manga/FullmetalAlchemist https://static.tvtropes.org/pmwiki/pub/images/fma_equivalent_exchange_8912.jpg]]]]
[[caption-width-right:350:[-You can't make a metal weapon without any metal first.-] ]]

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[[quoteright:350:[[Manga/FullmetalAlchemist https://static.tvtropes.org/pmwiki/pub/images/fma_equivalent_exchange_8912.jpg]]]]
[[caption-width-right:350:[-You
org/pmwiki/pub/images/fma_equivalent_exchange.png]]]]
[[caption-width-right:350:You
can't make a metal weapon without any metal first.-] ]]


Compare this trope to BalancingDeathsBooks, ConditionalPowers, and MutualDisadvantage. The tropes known as CallItKarma and TheGoldenRule attempt to apply this law of physics into ethics and morality.

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Compare this trope to BalancingDeathsBooks, ConditionalPowers, and MutualDisadvantage. The tropes known as CallItKarma and TheGoldenRule attempt to apply this law of physics into ethics and morality.
morality. A TransferredTransformation results when this is applied to {{Shapeshifting}}.


** A ritual spoken of only as the Unforgivable Ritual[[note]]Both the rituals name and process are under Taboo so speaking either will alert the authorities[[/note]] gives a massive power boost but has two distinct costs. First, it requires completely dedicating yourself to a cause of your choosing and you become somewhat obsessed with it. Second, and more dire, the ritual kills your true love, even if you haven't met them yet. Both Dumbledore and Voldemort are revealed to have used said ritual.

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** A ritual spoken of only as the Unforgivable Ritual[[note]]Both the rituals ritual's name and process are under Taboo so speaking either will alert the authorities[[/note]] gives a massive power boost but has two distinct costs. First, it requires completely dedicating yourself to a cause of your choosing and you become somewhat obsessed with it. Second, and more dire, the ritual kills your true love, even if you haven't met them yet. Both Dumbledore and Voldemort are revealed to have used said ritual.

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* In ''Seriies/KamenRiderZiO'', the BigBad Another Decade's powers work off of this principle. He can summon AlternateUniverse versions of Kamen Riders to serve as his minions, but in order to do so he first has to take a person from the real world and put them in a pocket dimension (in which they get to live out their greatest desire on infinite loop).


* The spiky Rokakaka fruits that appear in ''Manga/JojosBizarreAdventureJojolion'' are basically a HealingPotion, but the person who consumes the fruit loses another body part as [[TakenForGranite it becomes stone]]. Infertile women become pregnant, but they produce sand instead of milk. Elderly people missing teeth grow back stone ones. A famous baseball player heals his busted arm, but his jaw becomes solid stone. An elderly man grows back an amputated leg, but his eyes turn to stone and crumble away. There is one variety that does not apparently produce this exchange, [[spoiler:and it's the variety that apparently helped in the fusion of Yoshikage Kira and Josefumi Kujo into the hero Josuke Higashikata]].

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* The spiky Rokakaka fruits that appear in ''Manga/JojosBizarreAdventureJojolion'' are basically a HealingPotion, but the person who consumes the fruit loses another body part as [[TakenForGranite it becomes stone]]. Infertile women become pregnant, but they produce sand instead of milk. Elderly people missing teeth grow back stone ones. A famous baseball player heals his busted arm, but his jaw becomes solid stone. An elderly man grows back an amputated leg, but his eyes turn to stone and crumble away. There is one variety that does not apparently produce this exchange, [[spoiler:and it's the variety that apparently helped in the fusion of Yoshikage Kira and Josefumi Kujo into the hero Josuke Higashikata]].Higashikata]], and that quality is what makes it desirable to a multitude of antagonistic parties.

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* ''Series/TheTwilightZone1959'':
** In the final scene of "[[Recap/TheTwilightZoneS3E98TheDummy The Dummy]]", Jerry Etherson and Willie have switched places so that Jerry has become the dummy and Willie the ventriloquist. In his closing narration, Rod Serling says that he has gone from "boss to blockhead."
** In "[[Recap/TheTwilightZoneS4E113TheParallel The Parallel]]", Major Robert Gaines loses contact with Earth and is accidentally transported to a parallel universe in which he is a colonel. At the end of the episode, shortly after he returns home, the space program receives a transmission from Colonel Robert Gaines.


** The nightmare exchange rate can also strike at random: the blackout Fool called Patchface is said to have been a clever lad, one trained well in Volantis to be sold on as an accredited court fool at some expense. So he was bought to work as a freedman at his court by Stannis Baratheon's father. Unfortunately, the ship sank on the way back, just in sight of Stormsend. All hands were lost, leaving many families grieving for their loved ones. Except... Patchface alone washed up days later, seemingly more dead than alive, but not as an actual corpse like all the other bodies. [[MadOracle He's]] not [[MonsterClown exactly]] been [[MagicalClown the same]], since, though. On the plus side: he's scarily accurate.

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** The nightmare exchange rate can also strike at random: [[TheJester the blackout "lackwit" Fool called Patchface Patchface]] is said to have been a clever lad, one trained well in Volantis to be sold on as an accredited court fool at some expense. So he was bought to work as a freedman at his court by Stannis Baratheon's father.father, since he could afford him and had three sons to try distracting. Unfortunately, the ship sank on the way back, just in sight of Stormsend. All hands were lost, leaving many families grieving for their loved ones. Except... Patchface alone washed up days later, seemingly more dead than alive, [[CameBackWrong but not as an actual corpse like all the other bodies. bodies]]. [[MadOracle He's]] not [[MonsterClown exactly]] been [[MagicalClown the same]], since, though. [[PowerBornOfMadness though]]. Which most characters put down to brain damage he must've got while almost drowning. On the plus side: he's scarily accurate.got a secure job out of pity. [[TheCassandra One which means he's rarely paid much attention to]], for all he's arguably the clearest and most accurate seer available in the series.

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