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* In ''Videogame/{{Lightmatter}}'', the eponymous Lightmatter is hailed as the world's first infinitely renewable energy source. [[spoiler:It turns out to be an aversion. Lightmatter doesn't produce free energy. It produces energy by ''draining'' that energy from its surroundings and living beings. This is why the shadows in this game are deadly and why everyone who worked on the project suffered cellular degradation.]]


** Salacia, a vampire in ''Discworld/{{Thud}}'', has issues with this when she turns into a bat. She has to settle for turning into many bats. Which are a pain to get back together...

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** Salacia, a vampire in ''Discworld/{{Thud}}'', ''Literature/{{Thud}}'', has issues with this when she turns into a bat. She has to settle for turning into many bats. Which are a pain to get back together...



** While the Discworld novels are reasonably respectful of conservation of energy (as much as one can be while satisfying the demands of [[TheoryOfNarrativeCausality Narrative Causality]] and RuleOfFunny) they often play fast and loose with ''entropy''. A lot of [[Discworld/IShallWearMidnight Tiffany Aching's]] practical magic, in particular, involves moving heat from one place to another. It's never really clear whether the net heat of the system increases, as it must in real-life refrigeration.

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** While the Discworld novels are reasonably respectful of conservation of energy (as much as one can be while satisfying the demands of [[TheoryOfNarrativeCausality Narrative Causality]] and RuleOfFunny) they often play fast and loose with ''entropy''. A lot of [[Discworld/IShallWearMidnight [[Literature/IShallWearMidnight Tiffany Aching's]] practical magic, in particular, involves moving heat from one place to another. It's never really clear whether the net heat of the system increases, as it must in real-life refrigeration.


[[Administrivia/TropesAreTools Of course, it could be argued that any use of energy which is unequivocally already supernatural to begin with,]] [[JustifiedTrope just by definition doesn't necessarily have to follow physical laws anyway.]]

Minor sidebar for Science Fiction authors who ''want'' to violate conservation of energy: You'll want to look up [[http://en.wikipedia.org/wiki/Noether%27s_theorem Noether's Theorem]], which says that for every differentiable symmetry of the action of a physical theory there is a corresponding conserved quantity. This basically means that if energy is not conserved, then the laws of physics must be changing over time. [[http://en.wikipedia.org/wiki/Conservation_of_energy#Noether.27s_theoremSee See also The Other Wiki's further coverage as this applies to conservation of energy.]]

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[[Administrivia/TropesAreTools Of course, it could be argued that any use of energy which is unequivocally already supernatural to begin with,]] with]], [[JustifiedTrope just by definition doesn't necessarily have to follow physical laws anyway.]]

anyway]].

Minor sidebar for Science Fiction authors who ''want'' to violate conservation of energy: You'll want to look up [[http://en.wikipedia.org/wiki/Noether%27s_theorem Noether's Theorem]], which says that for every differentiable symmetry of the action of a physical theory there is a corresponding conserved quantity. This basically means that if energy is not conserved, then the laws of physics must be changing over time. [[http://en.wikipedia.org/wiki/Conservation_of_energy#Noether.27s_theoremSee See also The Other Wiki's further coverage as this applies to conservation of energy.]]
energy]].



** There is also the [[http://dwarffortresswiki.org/index.php/DF2012:Water_wheel#Dwarven_Water_Reactor Dwarven Water Reactor,]] which is a power-producing perpetual motion machine that relies on using a pump to raise water to power multiple waterwheels (which are hooked up to the pump and whatever else needs power)

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** There is also the [[http://dwarffortresswiki.org/index.php/DF2012:Water_wheel#Dwarven_Water_Reactor Dwarven Water Reactor,]] Reactor]], which is a power-producing perpetual motion machine that relies on using a pump to raise water to power multiple waterwheels (which are hooked up to the pump and whatever else needs power)


[[TropesAreTools Of course, it could be argued that any use of energy which is unequivocally already supernatural to begin with,]] [[JustifiedTrope just by definition doesn't necessarily have to follow physical laws anyway.]]

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[[TropesAreTools [[Administrivia/TropesAreTools Of course, it could be argued that any use of energy which is unequivocally already supernatural to begin with,]] [[JustifiedTrope just by definition doesn't necessarily have to follow physical laws anyway.]]

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* {{Discussed}} in ''LightNovel/CopCraft''. When Tilarna explains [[{{Unobtainium}} vaifaht steel]], one of the other detectives asks her if a vaifaht steel item's mass stays the same when it transforms. In response, Tilarna tosses the detective her cloak, which, [[AvertedTrope being able to transform into bulletproof armor, is pretty heavy]].


--->'''Alice''': [[spoiler: [[NamestoRunAwayFromReallyFast We are Maxwell's Demons.]] We are powered by blackholes, [[SlasherSmile and the laws of physics are optional for us.]]

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--->'''Alice''': [[spoiler: [[NamestoRunAwayFromReallyFast We are Maxwell's Demons.]] We are powered by blackholes, [[SlasherSmile and the laws of physics are optional for us.]] ]]]]

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* ''Webcomic/AliceGrove'' offers a more disturbing form - Alice, Sedna, and Church are able to blow off ''every'' law of thermodynamics, and then some, by operating as [[spoiler: ''entropy sinks''.]]
--->'''Alice''': [[spoiler: [[NamestoRunAwayFromReallyFast We are Maxwell's Demons.]] We are powered by blackholes, [[SlasherSmile and the laws of physics are optional for us.]]


* In ''Anime/PuellaMagiMadokaMagica'', the WeaselMascot specifically mentions that magic defies the laws of thermodynamics. [[spoiler:This is very important to him, as he's harvesting the magic power generated by Magical Girls mutating into reality-warping {{Eldritch Abomination}}s in order to stave off the heat death of the universe, even though he does not understand why this energy can violate thermodynamics in the first place.]]

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* In ''Anime/PuellaMagiMadokaMagica'', the WeaselMascot Kyubey specifically mentions that magic defies the laws of thermodynamics. [[spoiler:This is very important to him, as he's harvesting the magic power generated by Magical Girls mutating into reality-warping {{Eldritch Abomination}}s in order to stave off the heat death of the universe, even though he does not understand why this energy can violate thermodynamics in the first place.]]


** Beerus in ''Dragonball Super'' goes one further: he has the ability to "nullify" energy, completely erasing it from existence. Good thing too: [[spoiler:that energy burst he and Goku created during their battle was potentially powerful enough to annihilate multiple stars whether or not Goku had managed to block it (which he didn't).]] Of course, Beerus ''is'' the God of Destruction, and he has that title for a reason.

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** Beerus in ''Dragonball ''Dragon Ball Super'' goes one further: he has the ability to "nullify" energy, completely erasing it from existence. Good thing too: [[spoiler:that energy burst he and Goku created during their battle was potentially powerful enough to annihilate multiple stars whether or not Goku had managed to block it (which he didn't).]] Of course, Beerus ''is'' the God of Destruction, and he has that title for a reason.



* ''Manga/{{Naruto}}'': About the same reasons as ''Dragonball'', including the "Chakra system" that basically increases as a shinobi trains and matures. Subverted with the titular character, because most of his techniques are impossible for the characters WITHOUT demons nesting inside of their souls.

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* ''Manga/{{Naruto}}'': About the same reasons as ''Dragonball'', ''Dragon Ball'', including the "Chakra system" that basically increases as a shinobi trains and matures. Subverted with the titular character, because most of his techniques are impossible for the characters WITHOUT demons nesting inside of their souls.


* GaoGaiGar [[ZigZagged zigzags]] this trope. [[{{Robeast}} Zonders]] need to consume inorganic matter to increase in size, the [[DropTheHammer Goldion Hammer]] dissolves matter into unknown glowing particles, the Eraserhead missile nullifies energy by redirecting it outside of the atmosphere, and Zonder Metal Plants need external sources of energy to bloom. On the other hand, Zonder metal is seemingly reduced to nothing by G-stone energy, and the G-stone itself can seemingly increase its output power indefinitely, corresponding to its user's HeroicSpirit.

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* GaoGaiGar ''Anime/GaoGaiGar'' [[ZigZagged zigzags]] this trope. [[{{Robeast}} Zonders]] need to consume inorganic matter to increase in size, the [[DropTheHammer Goldion Hammer]] dissolves matter into unknown glowing particles, the Eraserhead missile nullifies energy by redirecting it outside of the atmosphere, and Zonder Metal Plants need external sources of energy to bloom. On the other hand, Zonder metal is seemingly reduced to nothing by G-stone energy, and the G-stone itself can seemingly increase its output power indefinitely, corresponding to its user's HeroicSpirit.


-->-- '''Vaarsuvius''', ''Webcomic/TheOrderOfTheStick: On the Origin of [=PCs=]''

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-->-- '''Vaarsuvius''', ''Webcomic/TheOrderOfTheStick: On the Origin of [=PCs=]''
Recap/OnTheOriginOfPCs''


* Subverted in Literature/LarryNiven's ''Literature/TheMagicGoesAway'' fiction. All magic is fueled by mana, a natural non-renewable resource. The setting is a '[[TheTimeOfMyths lost age]]' of high magic on the decline, as the last of the world's magic is expended, leaving behind the mundane world we live in.

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* Subverted in Literature/LarryNiven's Creator/LarryNiven's ''Literature/TheMagicGoesAway'' fiction. All magic is fueled by mana, a natural non-renewable resource. The setting is a '[[TheTimeOfMyths lost age]]' of high magic on the decline, as the last of the world's magic is expended, leaving behind the mundane world we live in.

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**In the same book, when the character first shrinks he funds himself in a puddle of pink slime surrounded by a ring of grayish dust . The gray stuff turns out to be his clothes, weapons, etc. and the pink slime is...the rest of him. Double-Eww.

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* ''Literature/{{Worm}}'': At first it seems to be played straight: superpowers do not follow the laws of physics. Later, as more about the powers is learned, it turns out conservation of energy is being obeyed: [[spoiler:each superpower ("shard") has a finite amount of energy in it, and if it runs dry its associated powers will cease working. That well of energy is ''enormous'', such that most superpowers will conceivably keep working for thousands of years, but it is still finite. Furthermore, many of the shards that appear to "produce" new matter are in fact drawing raw material from parallel timelines rather than generating it out of their energy.]]

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* In ''WesternAnimation/YoungJustice'', Beast Boy's shapeshifting powers come from a blood transfusion from Miss Martian, but unlike her he can only turn into animals and his transformations completely ignore conservation of mass. [[spoiler:While he's trapped in a coma dream in "Nightmare Monkeys", a magical monkey god claims that this is because ''he'' is the true source of Beast Boy's powers rather than Miss Martian's blood.]]

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