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[[quoteright:282:[[TabletopGame/YuGiOh http://static.tvtropes.org/pmwiki/pub/images/Chaos_Sorcerer_3114.jpg]]]]
[[caption-width-right:282:[[CastingAShadow Darkness]] and [[LightEmUp Light]] -- two great tastes that go great together!]]

->''"Light belongs to shadow, shadow to light\\
Chasing one another to the very end"''
-->-- '''Bonnie Pink''', ''VideoGame/TalesOfVesperia'', "Ring a Bell" (translated)

The IdealHero is the champion of all that is good. Thus, [[LightEmUp his power will be that of light]], he will dress in [[LightIsGood white]] or [[RedIsHeroic bright primary colors, like blue and red]], and he will [[VillainsActHeroesReact rarely take proactive action against the villain,]] [[{{Protectorate}} preferring to play defensively]] and [[BarrierWarrior protect]] and defend the innocent. He will also [[JusticeWillPrevail champion the causes of love, courage, and hope]]. Only natural, such good powers could ''[[GoodPowersBadPeople never]]'' be used for evil!

Of course, sometimes you have an AntiHero, the guy who wields [[CastingAShadow the power of darkness]], [[BadPowersGoodPeople powers himself on negative emotions]], and probably has an [[DarkAndTroubledPast angsty past.]] He probably dresses in all [[DarkIsNotEvil black]], too. In extreme cases, the Dark Hero would like nothing, ''nothing'' better than to wrap his hands around his archnemesis' throat and strangle the life out of him. Think [[VideoGame/{{Boktai}} Sabata]], ComicBook/{{Raven}}, and Franchise/{{Batman}}.

But ''our'' guy, the Yin-Yang Bomb user, doesn't care about all those things. [[TheRedMage He uses]] [[ComboPlatterPowers both]]. Not just that, but often, he will [[AllYourPowersCombined combine them into something higher]] and invariably [[InfinityPlusOneElement ridiculously more powerful]]. Dark and light are not evil and good; they appear together a lot for good reasons. To resolve the storyline or beat the boss, the hero must grab the reins of both and wield them in a [[FusionDance harmony of fusion]].

Ying Yang Bombers can use other diametrically opposed forces as alternatives to Light and Dark, such as: [[OrderVersusChaos Order and Chaos]], [[HarmonyVersusDiscipline Harmony and Discipline]], Ice and Fire, or use a mixture of [[ThePowerOfLove Love]] and [[ThePowerOfHate Hatred]].

Yet another variation is the result of a character who, whether from [[PowerBornOfMadness insanity]], [[AchievementsInIgnorance ignorance]], [[BlueAndOrangeMorality indifference to]] [[ItAmusedMe the rules]], or [[GodzillaThreshold sheer desperation]], [[CrossingTheStreams combines two forces]] which every rule in the book says should not be combined. In the event that they survive this, they may thereafter retain this ability to harness the two forces at will.

Sometimes overlaps with EnergyDonation or AllYourPowersCombined. Naturally, good buddies with DarkIsNotEvil, or, in the case that the ''villain'' uses this, with LightIsNotGood. The result is frequently NonElemental, ignoring elemental resistances. Or, as demonstrated in a few cases, the effect may be able to completely destroy something and recreate it (usually as a child). Sometimes, an EnemyMine with a villain may result in them combining their powers to do this. Contrast MutuallyExclusiveMagic.

See also YinYangClash. As described in said page, yin and yang are actually 2 halves of the same thing that, when they "clash", become this instead, i.e a state where one harmonizes the yin and yang, called "taijitu" or "taikyoku".



[[folder:Anime & Manga]]
* In the climax of the ''Roleplay/RecordOfLodossWar'' {{OAV}} miniseries, only Parn, wielding both the Holy Sword of Falis and the Demon Sword Soul Crusher, can stop the resurrection of the Mad Goddess Kardis.
* ''Anime/GaoGaiGar'''s "Broken" right hand represents destruction, his "Protect" left hand protection. Individually, they function as a RocketPunch, Broken Magnum, and a [[DeflectorShields shield]], Protect Shade. Combined, they form the FinishingMove ''Hell and Heaven'', which destroys a Zondar completely while cleanly removing its [[PoweredByAForsakenChild human]] core. Less directly, in the {{OVA}}, [=TenRyuJin=] is the combined form of [=KouRyu=] and [=AnRyu=] (Light Dragon and Dark Dragon), and BigBad [[AGodAmI Palparepa]] matches Hell and Heaven with his own ''God and Devil'', though it's unclear if it really counts except in name. It's worth noting that in ''GGG'', destruction isn't necessarily an "evil" power -- [=GaoGaiGar's=] original form, Genesic, is a god of destruction, with the explanation that destruction is necessary for new beginnings, and allows for "the challenge of a new hero."
* ''LightNovel/{{Slayers}}'':
** The final BigBad of ''Slayers TRY'' is the fusion of Mazoku Lord Darkstar and its opposing god Volphied. It took the a spell that combined the powers of Ruby Eye Shabranigdo and Flare Dragon Celphied, channeled through the Dark Star weapons, in order to defeat him. The spell had the effect of a complete rebirth, allowing Filia to raise the BigBad as a child.
** In ''Slayers NEXT'', the [[ShrinkingViolet timid]] [[TheMedic white mage]] [[WhiteMagicianGirl Sylphiel]] mastered the powerful BlackMagic spell [[FantasticNuke Dragon Slave]] just to impress the guy she liked.
* ''Franhchise/{{Digimon}}'':
** ''Anime/DigimonFrontier'': Light-wielding Koji had to take on Koichi's dark powers to give the team the edge needed against [[FallenAngel Lucemon]], who had learned to combine darkness and light into his ultimate attack.
* In ''Manga/{{Bleach}}'', Ichigo (as well as the Vizard and Arrancar) wield both the powers of the Shinigami and that of the monsters they fight, the Hollow.
* ''Manga/{{Naruto}}'':
** The Bijudama (Tailed Beast Ball), is composed of 80% positive and 20% negative chakra.
** Also, ''senjutsu'', or "Sage Energy", is a fusion of a shinobi's chakra and of [[TheForce the all-present energy of the world around them]]. Incredibly difficult (and [[GoneHorriblyWrong very]] [[TakenForGranite risky]] if messed up), but [[TookALevelInBadass the]] [[SuperMode results]] are worth it.
** He also briefly mixes Sage Mode with his Kyuubi chakra.
** Izanagi uses both Yin and Yang chakra, [[spoiler:Yin from the Sharingan, Yang from the genes of Senju]]. Instead of a FantasticNuke, it allows the user to [[RealityWarper warp reality]].
** When Naruto and Sasuke work in tandem [[spoiler: using their Yang and Yin sage chakras, respectively, this happens.]]
* In ''Manga/DGrayMan'', Allen has the power of Innocence to destroy akuma as well as having powers from an akuma curse. [[spoiler: As well as those of the 14th Noah, the Musician, also known as the Noah of Destruction]].
* ''Manga/MahouSenseiNegima''
** Takamichi [[spoiler:and Asuna]] uses a technique called Kanka which fuses Magic and Ki to dramatically increase the user's abilities, with a stance reminiscent of ''Anime/GaoGaiGar'''s "Hell and Heaven" above. It is even called an "ultimate power".
** Not counting Negi himself, who starts to learn Dark Magic [[spoiler:after getting his ass handed down by Fate.]] Negi's "Dark Magic", however, as described in the [[AllThereInTheManual supplemental materials]], rely upon a long stream of ([[ShownTheirWork cited and footnoted]]) psychobabble that essentially says that, unlike the diametrically opposed Ying/Yang power of Kanka, the darkness of Dark Magic is all-encompassing, and even includes the powers of light. (Including some references to Erebos and Aether from mythology for good measure.) By embracing the all-encompassing darkness, he can still control powers of light, since they do not oppose, but the danger of the spell comes from the way that he stretches his sense of self so thin that he can lose control of his own powers. In chapter 314, Evangeline refers to Negi's way of doing things (not necessarily his magic) as the "gray path".
* ''Manga/UQHolder'', the sequel to ''Negima'', has the main character Touta who was given both the Black of Mars and the White of Venus (Negi's Dark Magic and Asuna's [[AntiMagic Magic Cancel]], respectively) at the same time in the hopes of creating a supremely powerful mage. Unfortunately, the two powers cancelled each other out, leaving him with the ability to use ''neither''. [[spoiler:Dana teaches him a spinning technique to act like a spiritual centrifuge, separating the powers from each other and allowing Touta to make use of them both, but only as long as he can keep up the "spinning".]]
* In ''Manga/YuYuHakusho'', after [[spoiler:being reborn as a half-demon, going to the Demon World, and setting up a tournament with ''unquestioned rule over all Demon World '' as the grand prize]], Yusuke [[spoiler:mixes his human Spirit Energy and his demonic energy together to enter a sort of {{super mode}}. The last time we saw anything like this, the character using it managed to beat almost the entire main cast at the same time, and the powerup for Yusuke is rather similar. Also by alternating between spirit and demon energy shots his projectiles become notably difficult to block with energy shields.]]
* ''Anime/YuGiOh5Ds'' has [[spoiler:Rex Goodwin]] grafting the arm containing the fifth Signer mark onto his body once he becomes a Dark Signer. Thus, he becomes a Signer ''and'' a Dark Signer at once, planning to use the powers of their respective deities to [[OmnicidalManiac destroy the world]] and [[AGodAmI remake it in his own image]].
* In ''Manga/FullmetalAlchemist'', Kimblee's prefered attack is this. Each hand has tattooed on its palm a symbol; on his right, there is a symbol that stands for the Sun, fire, and gold, and on his left, one that stands for the Moon, water, and silver. When he joins both symbols, the result is this ''[[StuffBlowingUp literally]]''.
* ''Manga/FairyTail''
** Natsu defeats [[spoiler:[[EvilCounterpart Zancrow]] in this manner; by canceling his own magic, Natsu gains the ability to eat Zancrow's flames. Then he combines his red dragon slayer flames with black god-slayer flames for a truly brilliant finishing move]].
** In chapter 296, Sting and Rogue combine their Light and Shadow Dragon-Slayer magic in a Unison Raid during their two-on-one fight against Natsu. [[spoiler:It's not enough.]]
** [[spoiler:The future version of Rogue Cheney is able wield both elements by himself. And he is more than enough to defeat Natsu at full power.]]
* ''LightNovel/ACertainMagicalIndex''
** All attempts to allow a person to use both magic and esper powers have ended in failure, except for [[spoiler:Tsuchimikado Motoharu]], and he has to be very careful not to kill himself with his powers. Might be the result of his power [[spoiler:being auto-ressurection]]
** Also, Acqua of the Back has the powers of being a Saint ''and '' a member of God's Right Seat, which would be mutually incompatible if not for [[RequiredSecondaryPowers a third ability that removes such limitations]].
* In ''Manga/KenichiTheMightiestDisciple'', there are two types of martial artists; Outward focusing [[TheBerserker Dou]] types that fight aggressively and turn their anger into a source of power, and inward focusing [[TranquilFury Sei]] types, who are calm and calculating and derive their power from inner peace and concentration. And then there is 'Seidou goui', a technique that combines the two for an explosive boost in power but that causes [[HeroicRROD permanent damage to the body]] if used for too long.
* In ''Literature/{{Id}}'', the title character has to negate a Yin-Yang bomb ''twice''. The first time, instead of blowing up the continent, the energy is used to transport him 10000 years back in time; the second time, it conveniently moves him 10000 years into the future, netting in three weeks lived in the past. Later, it turns out [[spoiler:what he did during those three weeks in the past has caused the creation of the world he's on and is the reason for almost the entire plot in the story]].
* In ''Manga/DaiNoDaibouken'' this is the basis for Pop's most powerful magic attack, Medoroa: generate fire with one hand, ice with the other, and combine them to shoot a beam of annihilation that can destroy [[MadeOfIndestructium orhicalcum]]
* ''Manga/CannonGodExaxxion'': The title mech (and the alien's space travel) is powered by a matter-antimatter reaction. In fact, the main reason the aliens wanted the Exaxxion was for its massive reserve of antimatter.
* In ''Manga/CardCaptorSakura,'' the two most powerful cards, the Light and the Dark, are always used together. Comes full circle in the [[Anime/CardCaptorSakura final movie]]. [[spoiler:The Nothing consumes the nameless card to become the Hope.]]
* In ''Manhua/TalesOfDemonsAndGods'', one of Nie Li's more powerful demon spirits is the Fanged Panda. While generally decried as weak and useless, much like all of Nie Li's abilities, it's simply got a slow and steady growth... and one of its most powerful abilities is literally called the 'Yin-Yang Bomb', firing two balls of light and dark which combine to hit ''hard''.
* In ''Manga/MyHeroAcademia'', Shoto Todoroki inherited fire powers from his father and ice powers from his mother, though he doesn't like his father much, so he spent his entire childhood using only his ice powers out of spite. However, he can only generate heat from one side of his body and cold from the other, meaning using both for more than a few seconds will create all sorts of health problems for him as his body becomes extremely unevenly heated.

[[folder:Card Games]]
* ''TabletopGame/MagicTheGathering'' is built on a foundation of five colors of mana, all of which embody different concepts and philosophies, as well as have different mechanics. Each color of mana has two "enemy" colors, which it is typically morally opposed to. Despite this, enemy colors are capable of working with each other to great effect, and both Wizards of the Coast's development and creative teams go to great lengths to ensure that each colored pair is given support in gameplay and makes sense flavor-wise. Enemy colored pairs have the potential to be ''very'' effective in gameplay, and certain pairs are widely used competitively (for example, one of competitive Magic's most dominant decks, Splinter Twin, is most often played using Blue and Red, which are enemy colors; even Splinter Twin decks that run another color still use both Blue and Red).
** A rundown of enemy-color pairs: White/Black is harsh, controlling, and often cruel, combining White's desire for order and Black's desire for power. Blue/Red is creative, driven, and often a little crazy, combining Blue's desire for knowledge and self-improvement with Red's passion and impulsiveness. Black/Green is focused on decay and rebirth, combining Black's interaction with death and Green's celebration of life. Red/White is often heavily martial, combining White's discipline and structure with Red's anger and impulsiveness. Green/Blue is often focused on biology and creatures, taking Blue's scientific aspects (and occasional focus on the ocean and its creatures) and Green's focus on nature. [[note]] From the Ravnica block, Blue/Red are the Izzet, Black/Green are the Golgari, Red/White are the Boros, Green/Blue are the Simic, which all match the general description here.[[/note]]
** Going beyond just two-color pairs, the Tarkir block introduced five clans which inhabit the plane of Tarkir, each of which embodies a "wedge" of colors -- that is, two allied colors and their shared enemy color (for example, the Mardu Horde is represented by the colors Red and Black, and their shared enemy color, White). Each clan smoothly integrates concepts from the enemy color it represents, and that color is (generally) just as important as the two allied colors, and makes each clan stronger as a whole.
** More generally, gold-colored cards that require more than one type of mana to cast and creatures with abilities that require a color besides their own to use have been a staple of the game for quite a while, and are almost always designed to be stronger than equivalent single-color cards of the same cost, since they require you be able to produce multiple colors of mana and thus be more open to resource deprivation. Even before ''that'', players themselves were encouraged to field more than one color to cover the weaknesses built into each one (including spells which can severely handicap a person whose cards are all of one color).
* The ''Tabletopgame/YuGiOh'' card game plays with this, the main example being the now infamous "[[GameBreaker Chaos]]" archetype (which has been banned for years but radically shifted the metagame), consisting of three monsters summoned by removing from play a DARK-Attribute monster and a LIGHT-Attribute monster. One of these, Chaos Sorcerer, provides the page picture. There are plenty of cards that act similarly, but the most prominent example is the appropriately named "[[ExactlyWhatItSaysOnTheTin Light and Darkness Dragon]]", a monster that has ''two'' Attributes (LIGHT and DARK, obviously) simultaneously. That and, well, [[http://fc05.deviantart.net/fs71/f/2012/195/0/2/light_and_darkness_dragon_by_kai1411-d57aa80.jpg just look at it]].
* In the game lore of ''Anime/CardfightVanguard'', after duelling with [[DarkIsEvil Blaster]] [[EvilCounterpart Dark]], [[LightIsGood Blaster]] [[TheHero Blade]] took up his sword and combined it with his own to become Majesty Lord Blaster, in order to fight [[BigBad Phantom]] [[OmnicidalManiac Blaster Overlord]].

[[folder:Comic Books]]
* In the Top Cow Universe, the ''ComicBook/{{Witchblade}}'' is the balance keeper between the forces of Light and Darkness. As a result it has traits of both its parents, the Angelus and ComicBook/TheDarkness.
* ''ComicBook/XMen'':
** Elixir has one hand that heals and one hand that kills for his powers. More specifically, he has golden skin (healing ability) with just a black stain (hurting ability). The black stain can move from one spot to another, and doesn't hurt ''him''. Sometimes, the black stain enlarges so much that [[BewareTheNiceOnes the entirety of Elixir's body turns black]], [[RoaringRampageOfRevenge and may the Maker help whoever pissed him off]] enough to make that happen. It is true, however, that at least in one occasion he (involuntarily) used both his hands (one golden and one black) on the same person, with... [[ConvenientComa unusual results]].
** The 2099 continuity had Xian, who also had the one hand heals/one hand destroys schtick.
** Magik/Illyana Rasputina tried to be an example (we'll see if she's still trying since coming back to life), practicing both dark and light magic. Sometimes she'd combine the two, like when she attempted to heal someone (light magic) while sitting backwards in a pentagram (dark magic). She kept falling to the dark side, though.
* During the Princes of Darkness arc of ''Franchise/JusticeSocietyOfAmerica'' (back when it was simply ''JSA''), Dr. Fate goes through an arc wherein his powers have been stolen by the BigBad, Mordru. He finally comes to the realization that he is both Chaos and Order, and so he can defeat Mordru, who is only a Lord of Chaos.
* ''Comicbook/GreenLantern'':
** On some occasions, Hal Jordan has picked up Sinestro's yellow ring and used it in combat. The last time he tried during the ''ComicBook/SinestroCorpsWar'', Hal put on all the rings that his hands could hold and all-out attacked Sinestro with them. Sinestro just shrugged, took control of all that yellow light, and sent it back to him. Hal apparently can control fear a bit due to his stint as Parallax's host, but Sinestro has much more experience and control. It's not so much controlling fear as it is the wearer's ability to instill fear in others; hence why Batman was among the first to be offered a ring, his whole persona is based on instilling fear into his enemies. Hal has the same potential, both because many still fear what he will do if he ever wants to regain the power he held as Parallax and also because of the fear he spread while gaining said power.
** He has also briefly wielded green and blue rings together as well; while they're not opposed to each other, they hold different objectives and their bearers have different methods.
** Played straighter in ''ComicBook/BlackestNight'', which sees [[JerkWithAHeartOfGold Guy Gardner]] become both a [[TheBerserker Red Lantern]] and a Green Lantern at the same time. Since they were fighting superpowered zombies that could only be destroyed by both a Green Lantern and a non-green Lantern, this is very handy. What made that a YinYangBomb is that Green Lanterns Hal Jordan and Laira had both ended up as Red Lanterns, and had stopped being Green for the duration. Seeing how [[Comicbook/GreenLantern one]] is fueled by willpower and self-control, and the other is powered by losing self-control, operating both is probably a bit tricky.
** Played still straighter in ''War of the Green Lanterns'', in which Guy Gardner manages to wield a red ring and a violet ring together, the two colors at the farthest extremes of the Emotional Spectrum. They represent rage and love, making this the most strongly opposing ring pairing.
** At one point, a green and yellow ring chose Mother Mercy at the same time, but she quickly decided to reject the yellow ring.
* In ''[[ComicBook/FinalCrisis Superman Beyond]]'', Quantum Superman fuses good matter Superman and evil antimatter Ultraman into a [[MindScrew hyper-contextual amalgamation of two symmetrical concepts]] and then they power a giant Superman thought-robot and beat up the personification of [[DarkerAndEdgier Grimdark]].
* ''ComicBook/PrideHigh'' has Lightspot, a faculty member who controls both light and darkness. The darkness power allows him to teleport by traveling through the shadow dimension, which has been hinted to be a very evil place.
* ComicBook/CloakAndDagger are not one person, but collectively they act as this.
* Mister Negative, one of the more recent ''SpiderMan'' villains. By day, Martin Li is the kindly, charitable owner of a soup kitchen whose visitors seem to be miraculously cured of their various ailments. By night the color-inverted Mr. Negative is a ruthless gangster who warps Li's charitable works to his own criminal aim (unless it's Li who's covertly redirecting Negative's efforts towards good).
* From the short-lived Razorline imprint of Marvel Comics, we got Saint Sinner, who wound up possessed by both a demon named Runesmith and an angel named Regina. He could [[EvolutionaryLevels "evolve"]] things with one hand and devolve them with another.
* In ''ComicBook/BlackMoonChronicles'', the thief Pile-ou-Face is dual-wielding [[TalkingWeapon two intelligent swords]], one good and one evil. A prequel comic shows how he came to possess them, after walking on an evil warrior and a paladin fighting with said swords, and scoring a MutualKill (to their weapons' frustration). Both swords then urged Pile-ou-Face to pick up one and destroy the other. Instead he grabbed both, ignoring their recriminations.

[[folder:Fan Works]]
* ''Fanfic/LulusBizarreRebellion'': [[Anime/CodeGeass Geass]] and [[Anga/JojosBizarreAdventure Stand]] cause anyone who are granted both to instantly die of a BrownNote, but get past that problem, whether by [[spoiler:being in a refrain coma]] or [[spoiler:being a Geass user possessed by Anubis]], and the resulting Stand will be orders of magnitude stronger, and affect the mind in some way.
* In the ''Fanfic/PonyPOVSeries'', it turns out that the Rainbows of Light and [[DarkIsNotEvil Darkness]] (and thus the Elements of Harmony and Chaos) are 'siblings' in a sense [[spoiler:and were both born from the Tree of Harmony]], and thus are fully capable of working, in the event the users of both are good guys. The first time they were ever united was [[spoiler:when they emerged and combined their power to grant Ponykind sapience and Dragonkind greater intelligence]], the second time was [[spoiler:when Magic Star used the Alicorn Amulet, which was forged from the Rainbow of Darkness, to weaken Lilith enough for Megan to finish her off with the Rainbow of Light]], and the most recent one is in the LooseCanon SequelSeries to Dark World (Dark World Drabbles), where both sets have a full team of Bearers and thus can use them in tandem [[spoiler:(which they do to permenantly kill Grogar when he returns after Discord's defeat)]].
* In the ''WesternAnimation/JackieChanAdventures'' fic ''Fanfic/TheUltimateEvil'', the concept of Others is this trope: a being that finds their Other (the half that makes them whole, conflicting yet combining with one's own strengths and weaknesses) can give and receive power [[WonderTwinPowers by touch]], because then the Others' conflicting chis attempt to merge. Should one of the [[DemonLordsAndArchdevils Demon]] [[ElementalEmbodiment Sorcerers]] find their Other, they can be given extreme power as their dark chi melds with the good chi of their Other, making them able to have both good and bad chi, which in turn allows them to perform any and ''all'' forms of magic. It is implied that should a Demon Sorcerer find and be bound to his/her Other, they will gain [[PhysicalGod unlimited power]]. It is not made as clear what the effects will be on the partner.
** The sequel ''The Stronger Evil'' states that [[spoiler:Shendu and Valerie's son Drago]] has potential in both sides of magic due to being born to two bonded Others.
* ''FanFic/AgesOfShadow'': During the climax of the Third Age arc, [[spoiler: the combined power of the Sun Souls permanently [[SealedEvilInACan seal]] [[FallenHero Jade]] in the Shadow Netherworld. In the process, the Sun Soul energy mixes with Jade's spilled blood; this mixture of magics kickstarts life in the barren Netherworld, including birthing four nonhuman infants.]]

[[folder:Films -- Live-Action]]
* ''Film/TheForceAwakens'': Kylo Ren is specifically mentioned as being an embodiment of the light and dark sides of the Force. While he clearly would deny this heavily, it's shown in his fighting style; Ren may be a dark side user, but his primary Force technique is the light-side associated Force Stasis. [[spoiler:After he kills his father, this becomes even worse and unbalances him, and this in combination with being shot in the gut and gradually injured gets his ass kicked in a lightsaber duel with two people vastly less experienced than him.]]
* ''Film/WarCraft2016'': "From light cometh darkness, from darkness cometh light". Khadgar manages to use this to [[spoiler:find the strength to resist [[BlackMagic fel]] in fel itself without getting corrupted]].

* ''Literature/LoneWolf''
** In book 7, ''Castle Death'', the owner of said castle, Lord Zahda, uses a Lorestone and a Doomstone in combination.
** Lone Wolf himself can wield a holy weapon like the Sommerswerd and infernal weapons like Helshezag. (Theoretically not at the same time, but that doesn't stop some players to have houseruled DualWielding.)
** The villain Vonotar the Traitor is said to be one of the only people able to master both the good-aligned Left-Handed Magic and the evil-aligned Right-Handed Magic.

* Franchise/StarWarsExpandedUniverse:
** Mace Windu's Vaapad form, detailed in ''Literature/{{Shatterpoint}}'', definitely counts; he refined the lesser lightsaber form of Juyo into a devastatingly effective technique by allowing himself to enjoy the fight, which channels the Jedi's aggression but also skirts dangerously with the Dark Side. He was the only Jedi to master Vapaad without succumbing to the Dark Side (although in fairness, [[spoiler:Depa mastered Vapaad and then fell to the Dark Side from [[WarIsHell something else]]]]).
** ''ComicBook/KnightsOfTheOldRepublic'' features a good-aligned Force user with a criminal past who's living in a self-imposed exile from the Jedi Order and draws equally on the Light and Dark sides to accomplish his goals.
** In the novel tie-in to ''VideoGame/StarWarsTheOldRepublic'', ''Literature/{{Revan}}'', when [[spoiler:Revan recovers all of his memories and thus his full knowledge of the Dark Side, his most powerful Force technique is to simply gather up as much of both as he can hold... and smash them together. It's enough to knock back an enemy who is fighting with the Dark Side energy of an entire world's population.]]
* Creator/BrandonSanderson:
** ''Franchise/{{Mistborn}}'':
*** This becomes the entire point of the end of the trilogy. The prophecied [[TheChosenOne Hero of the Ages]] destined to [[spoiler:combine the powers of Ruin and Preservation]] could be male or female based on the ancient grammar. [[spoiler:It turns out he's a eunuch instead.]] [[spoiler:Explored further in the ''Literature/WaxAndWayne'' sequel series: holding two diametrically opposed Shards makes Sazed, then known as Harmony, extremely powerful, but also makes it [[GodsHandsAreTied very difficult for him to take action]].]]
*** In addition, this trope is the secret of the immortality of the BigBad of the first book. The first book reveals two [[FunctionalMagic magic systems]]: Allomancy, which works by ingesting various metals and consuming them to get temporary power-ups, and Feruchemy, which works by saving up a person's own attributes like strength or health in metals and consuming them later in an EquivalentExchange. Both are {{Inherent Gift}}s. Allomancers are generally more dominant in society and more oriented towards combat, but we're told that Feruchemy has its own strengths and weaknesses and can do things that Allomancy can't. In the end, [[spoiler: we learn that if someone is both an Allomancer and Feruchemist, they can store up their own youth and health in metal and consume it over time with much greater efficiency, making them effectively immortal]].
** ''Literature/TheStormlightArchive'': In [[Literature/WordsOfRadiance the second book]], [[spoiler:a new type of highstorm, one of Odium, is summoned, going the opposite direction of normal storms]]. Shallan briefly hopes that they'll just cancel each other out, but Pattern warns her that they will feed off each other and increase in power. When it finally happens, the violence is so destructive that [[spoiler:''entire plateaus'' are thrown thousands of feet into the air]].
* Defied in ''Literature/TheBible''. As 2 Corinthians 6: 14 puts it, "For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness?". It's an analogy referring to physical light and darkness, not figurative. It's saying that righteousness and wickedness are as alike as light and darkness (meaning mutually exclusive), not that righteousness = light and evil = dark.
* Ursula K. Le Guin's ''Literature/TheLeftHandOfDarkness'' makes a poem about this (about the larger theme of balance in general): "Light is [[TitleDrop the left hand of darkness]], and darkness the right hand of light." They're one and the same.
* In ''Literature/TheDresdenFiles'', once Harry gains mastery over ice magic, coupled with his existing mastery of fire magic, he sometimes uses both, one after the other, to cause his opponents to explode into pieces. Given the difficulty of wielding opposing elements in tandem, using them like that wins him points in the supernatural community for being both very dangerous and stylish.
* ''Literature/TheChroniclesOfThomasCovenant'': Thomas Covenant becomes one of these in the second trilogy finale ''White Gold Wielder'' when [[spoiler:he attempts to burn the venom out of himself by walking into the banefire, but instead fuses with it to make himself an alloy of wild magic and venom, restoring his mastery over the power]].
* Most of the truly important mages of either faction in the ''Literature/SagaOfRecluce'' are gray mages, capable of using both order and chaos magic. These tend to be the most powerful mages in the world in whatever time they happen to live.
* ''Literature/TheWheelOfTime'' features [[MutuallyExclusiveMagic Mutually-Exclusive Magic]] of the sort where men and women get their powers from different sources, produce even identical magical effects in completely different ways (most explicitly mentioned when certain people learn how to Travel), and even use ''opposite'' techniques to just ''access'' magic...but the most powerful magical feats, like [[spoiler:the cleansing of ''saidin'']] or [[spoiler:the Bowl of the Winds]], require the use of female and male magic together. The symbol for the union of male and female magic is itself a simplified Yin-Yang. [[spoiler:In the climax of the series, Rand uses both the One Power (good) and the True Power (evil) to seal the Dark One's prison much more effectively than Lews Therin did.]]
* In ''Literature/SkulduggeryPleasant'', Valkyrie Cain sort-of becomes this when [[spoiler:she takes up Necromancy]].
* ''LightNovel/HighschoolDxD'':
** Before an important fight, [[DemonOfHumanOrigin Issei]] makes a deal with Red Dragon Emperor Ddraig, the spirit of his [[PowerFist Boosted Gear]], to unlock its [[NextTierPowerUp Balance Breaker]] form for ten seconds -- in exchange, Ddraig's influence encroaches on his body and transforms his arm into that of a dragon. When Balance Breaker fails, it turns out that ''the arm itself'' was his backup plan -- [[DisabilityImmunity since it's no longer demonic, it isn't harmed by holy symbols]], allowing him to use them against other demons with impunity. Later, Issei would take this further by integrating the holy sword Ascalon into his Boosted as a BladeBelowTheShoulder, despite Ascalon being a weapon designed to kill both demons and [[TheDragonslayer Ddraig himself]].
** Before he [[DemonOfHumanOrigin became a demon]] with SpontaneousWeaponCreation abilities, Kiba was a survivor of the Holy Sword Project, an experiment by corrupt clergy to create a person who could wield [[HolyIsNotSafe dangerous holy weapons]] like Excalibur. Reuniting with the spirits of his deceased friends from the project would allow Kiba to unlock his Balance Breaker: "Sword of Betrayer", a powerful weapon that has both holy and demonic properties at the same time. This turns out to be a major PlotPoint, as the [[BeyondTheImpossible sheer impossibility]] of someone merging the powers of {{God}} and {{Satan}} without them rejecting each other is proof that [[spoiler:both God and Satan are dead, and the archangels who took over for God are unable to keep all of the laws of reality in place]].
** Issei is able to integrate a fragment of Vali's [[StatusAilment Divine Dividing]] into his own [[StatusBuff Boosted Gear]] and use its powers as his own, despite them being diametric opposites. By this point Ddraig is no longer even surprised, and claims that Issei can do this because he's simply [[AchievementsInIgnorance too dumb to understand when something is impossible]].
** In volume 12, Issei receives a new body created from the energy of [[{{Ouroboros}} Ophis]] (the Dragon God of Infinity) and the flesh of [[BeastOfTheApocalypse Great Red]] (the Dragon God of Dreams). This is described as making him an OxymoronicBeing, a humanoid [[TitleDrop "Dragon of Dragons"]] whose power is both everything and nothing.
* The Lord's throne in ''Literature/ParadiseLost'' is secured upon a cave where light and darkness turn around each other infinitely, creating in Heaven something like day and night or maybe morning and twilight.

[[folder:Live-Action TV]]
* Common theme in the RobinHood ''Series/RobinOfSherwood'' series. Robin and his sword Albion are specifically said by Herne the Hunter to have the "power of light and darkness".
* One episode of ''Series/{{Charmed}}'' had Phoebe and Paige traveling to a MirrorUniverse and fighting their {{Evil Twin}}s. The battle between the two Paiges causes explosions due to their opposing powers colliding. Later, they team up with their evil twins and form "The Power of Four" by combining their powers to devastating effect.
* In the FinalBattle of ''Series/KamenRiderOOO'', Eiji defeats the BigBad by channeling the powers of his SuperPoweredEvilSide (themed on [[EmptyShell spiritual emptiness]], [[AnIcePerson cold]] and death) into his SuperMode (themed on [[{{Determinator}} passion]], [[PlayingWithFire flames]] and life).
* In ''Series/UltramanOrb'', Gai's fourth form is Thunder Breastar, a fusion of [[Series/{{Ultraman}} Zoffy]], leader of the Ultra Brothers, and [[Franchise/UltramanZero Ultraman Belial]], the franchise's SatanicArchetype.
* In the ''Franchise/StarTrek'' universe, most starships derive the vast energy needed to travel faster than light and to unleash devastating weaponry by harnessing matter and antimatter. The former method requires that streams of both matter and antimatter be annihilated in a controlled manner by passing them through [[AppliedPhlebotinum dilithium crystals]]. The latter method packs matter and antimatter into projectile torpedoes and forces them together to make devastating explosions in the multi-megaton range.
* Henry Mills in ''Series/OnceUponATime'' seems to be heading for this. The kid's got one hell of a TangledFamilyTree; his paternal grandfather is The Dark One, Rumplestilskin, his paternal great-grandfather is [[spoiler:PeterPan, who is a ''terrifying'' sociopath in this timeline]], his maternal grandparents are Literature/SnowWhite and PrinceCharming. His adopted mother is Snow White's stepmother, and ''her'' mother was even worse. His birth mother is explictly called a prophesied [[TheChosenOne "Savior"]]. The kid has ''just'' hit his teens, but survived the same sleeping curse that hit grandma Snow, used it to deliver an artifact to Literature/SleepingBeauty via dreams, used the heart-ripper spell his adopted mama is fond of (though he used it on himself), and has shown to have some of the best and worst traits of ''all'' of the above kinfolk. Some fans just joke he ought to be handed a [[VideoGame/KingdomHearts keyblade]] and be done with it.
** [[spoiler:Regina]] may count, too. She was already a powerful dark sorceress, but as of Kansas, she now has powerful light magic as well. In season 4, she seems to be using both (ripping out hearts is definitely dark magic, but the protection spells in Fall were probably light magic since [[spoiler: her Shattered Sight persona]] couldn't get through them).
** And then we have [[spoiler:Emma Swan]]. She is two different extremes of both light and dark. [[spoiler:Not only is she the ultimate creation of TrueLove, but she's also the Dark One.]]
* [[InstantAwesomeJustAddDragons Dragons]] in the ''Series/GameOfThrones'' universe are supposedly [[PlayingWithFire embodiments of fire]]. [[ZombieApocalypse The]] [[TheUndead White]] [[ArmyOfTheDead Walkers]] are supposedly [[AnIcePerson embodiments of ice]]. One would think that according to this logic, [[spoiler:the Night King couldn't [[AnimateDead raise a dragon from the dead]]]]. Oh, how wrong you'd be...

[[folder:Myths & Religion]]
* In the religion of Voodoo, a [[http://en.wikipedia.org/wiki/Bokor bokor]] is someone who "serves the loa with both hands", meaning they combine light and dark magic.

[[folder:Tabletop Games]]
* The Shadow Sun Ninja PrestigeClass in ''TabletopGame/DungeonsAndDragons''. The requirement of the class is a good alignment, despite most of the powers being rather dark in nature, or mixing light/darkness (and hot/cold) for both healing and hurting. This is probably a necessity to not give in too much to the dark side, a definite risk with the peak abilities of the class.
* Major NPC Vaslov Jakoba in ''TabletopGame/{{Ironclaw}}'' can cast both black and white magic, a source of much consternation in the Church. Mechanically, there's nothing preventing player characters from doing the same.
* Eternal equilibrium, a 9th level [[spoiler:Elementalist]] card in {{Gloomhaven}}. If you consume both light and dark with it, not only does it deal high damage for a reusable {{Area of Effect}} attack, but it also applies both curse and muddle to every targets. Curse add a {{Critical Failure}} card in the enemy attack deck, and [[{{Luck Manipulation Mechanic}} muddle force the enemy do draw two cards and take the worst when attacking, maximizing the miss chance from the curse]].

[[folder:Video Games]]
* From ''VideoGame/SilhouetteMirage'', Shyna is a textbook example. Her body is actually split down the middle, [[LightEmUp Mirage]] on one side and [[CastingAShadow Silhouette]] on the other. Zohar, another Protean, does it somewhat differently, with alternate Silhouette and Mirage appearances, which also happen to be different genders.
* In ''VideoGame/DarkSoulsIII'', [[TheHeavy Pontiff Sulyvahn]] fights the [[PlayerCharacter Ashen One]] [[OneHandedZweihander by]] DualWielding [[{{BFS}} greatswords]] that use diametrically opposed powers: [[CastingAShadow Abyss Sorcery]] in the Greatsword of Judgment, and the [[{{Hellfire}} Profaned Flame]] in the Profaned Greatsword.
* In ''VideoGame/SuperRobotWarsK'', [[Anime/GunXSword El Dora V]] gains a finishing move which is a visual shoutout to ''Anime/GaoGaiGar'''s Hell and Heaven. Its name? "''El Inferno y Cielo''". Regrettably, El Dora Soul does not retain it.
* ''VideoGame/{{Terraria}}'':
** You can explore the blighted, dark lands of the Corruption (or the Eldritch-style flesh covered lands of [[EldritchAbomination the Crimson]]) and the joyful, light-aligned Hallow and find respectively Dark and Light Souls, which are used to make or upgrade dark or light-themed equipment. Fuse them with two particular (and rather rare) items and you obtain the Dao of Pow, an EpicFlail which is essentially a huge spiked Yin-Yang on a chain capable of massive damage and confusing any enemy it touches.
** As of Terraria 1.2, Combining the [[InfinityMinusOneSword True Night's Edge and the True Excalibur]] at a Demon Altar will cause the power of The Corruption and the [[LightIsNotGood The Hallow]] to cancel out and produce the [[InfinityPlusOneSword Terra Blade]].
* A variation of this is one of six elements in ''VideoGame/SkiesOfArcadia'': the powers that are bestowed by the [[WeirdMoon Silver Moon]] are that of life and death. Silver spells either revive fallen comrades or cause instant death. [[spoiler:This also applies to the Silvites, the old peoples who once lived during the Old World under the Silver Moon: instead of having just one crystal, all of them hold a fragment of the Silver Moon Crystal in their bodies, and removing them, as Ramirez tries to demonstrate on Fina in-game, kills the host.]]
* ''Franchise/FinalFantasy''
** ''VideoGame/FinalFantasyIV''. The main prophecy speaks of "light and darkness cast aloft". Cecil is pure light at the end of the game, but it does take both him and [[spoiler:his brother Golbez]], still in the dark side, to deal with the BigBad in the end.
** Palom and Porom's Twincast works off this concept, as do a couple of [[CombinationAttack Bands]] in the sequel, ''VideoGame/FinalFantasyIVTheAfterYears'': Rosa and Rydia's "Holy Burst", Cecil and [[spoiler:Golbez]]'s "Ultima Spark", and Palom, Porom, Rosa, Leonora, and Rydia's "Infinity".
** In ''VideoGame/DissidiaFinalFantasy'', Cecil becomes one, freely switching between Paladin and Dark Knight as he fights.
--->'''Cecil:''' (''during his EX Burst'') Light and darkness cast aloft!
::: And it gets {{lampshaded}}.
--->'''[[VideoGame/FinalFantasyX Jecht]]:''' Light, Dark, just make up your mind!
** Before this, ''VideoGame/FinalFantasyIII'' had the Light Warriors unable to defeat the Big Bad without invoking the power of the Dark Warriors, who had previously combatted the unnatural growth of Light (The world now being in an unnatural state of Dark.)
** The DS version of the game replaced the Mystic Knight class with the functionally identical Dark Knight class. Allowing a Light Warrior to fight with Dark power.
** An interesting [[BonusBoss superboss]] example comes into play in ''VideoGame/FinalFantasyXII'', with the [[DarkIsEvil Hell Wyrm]] boss. Despite it being called the [[{{Satan}} King of Hell]] in the bestiary, it's strongest attack is '''Holy''' elemental. This is also considering this boss has access to darker abilities, such as Darkga.
** The Red Mage job of ''VideoGame/FinalFantasyXIV'' functions a bit like this. In the XIV universe Red magic is achieved by using the body's own natural aether amplified by their crystal focuses to cast both white and black magics and storing the resulting aether within. When in balance the two combine to form red magic, which is delivered by melee attacks and amplified by their swords. The basic idea being that the Red Mage does not have to drain aether from the land to cast.
* ''VideoGame/GranblueFantasy'':
** Notably Vira and Amira, who can both acquire the ability to wield light and darkness at once (Amira through her half-demon half-angel heritage, Vira with her natural dark attribute and her ability to channel the power of the primal beast Luminiera).
** Oxymoron, a major boss, is probably the most shining example, with its name, half-and-half color scheme, and concept (being two opposite forces sealed together) but is fire/water instead.
** Twin Elements (known as Flame=Glass in Japanese) is the fusion born from a pair of draconic beings wielding Fire and Water, and is capable of delivering this through its Signature Move, Frigid Blaze.
* [[spoiler:The title character]] of ''VideoGame/{{Bayonetta}}'' is born of both a Lumen Sage [[spoiler:who turns out to be Father Balder]] and an Umbra Witch.
* Most main characters in the ''[[Franchise/ShinMegamiTenseiPersona Persona]]'' (or ''Franchise/ShinMegamiTensei'') series can wield both Light and Dark magic. Curiously, they are both insta-kill magics instead of healing (which most often shows up on Wind or Water Personas).
** ''Shin Megami Tensei: Devil Children: Book of Light'' and ''Book of Dark'' (''[=DemiKids=]'' in the states) was ''all about'' this. The game was OneGameForThePriceOfTwo, one "dark" version and one "light" version, which followed one story from two viewpoints, Jin and Akira, also light and dark, respectively. The final boss was in two parts, also one light and one dark. Akira fought the light half, Jin fought the dark half, and the storyline had it so that both were fighting at the same time.
** Furthersome, Naoto from ''VideoGame/{{Persona 4}}'' was practically a pure incarnation of this. Specially considering how in the ''Persona'' series it's ''hard'' to hold both Light and Dark attacks simultaneously.
** The strongest personification of this trope in the ''Persona'' series is Armageddon, the strongest attack in the games, doing [[ThereIsNoKillLikeOverkill 9999]] [[NonElemental non-type]] [[AlwaysAccurateAttack unavoidable]] damage to everything or an automatic victory. It is made by combining the opposing aspects of [[LawfulNeutral Satan]] and [[ChaoticNeutral Lucifer]].
** In the MMO ''VideoGame/ShinMegamiTenseiImagine'', they are no longer light and dark, but Death and Expel. In an odd variation, player characters cannot use death or expel themselves. The closest, however, is that they can use both white magic (healing/buffing skills) and dark magic (damage based/debuffing skills) in unison, and each one is a separate class, so you could have a person who can both debuff and buff, or in closer symbols for light and dark, revive all party members at full health and then blow up the enemies with a blast of destructive energy (or combinations thereof). Any character who masters two skills that correspond with each other could be considered a non-alignment yin-yang bomb, if you master counter/dodge and a melee based skill you have the distinct possibility of becoming unhittable in one-on-one combat, however only in one-on-one.
** While the sides of order and chaos, represented respectively by angels and fallen angels, are generally opposed in most games in the series, the plot in ''VideoGame/{{Shin Megami Tensei IV Apocalypse}}'' reveals that they are two halves of the forces of YHVH, who deliberately goaded half into rebelling so that they would fight against each other in a forever war. In the end, the leaders of both sides, realizing they were being played, [[FusionDance fused together]] to restore their original form to aid the main characters in the last fight against [[GodIsEvil God]].
* ''Franchise/KingdomHearts''
** Riku's ending in ''VideoGame/KingdomHeartsChainOfMemories'' and throughout ''358/2 Days'' and ''VideoGame/KingdomHeartsII''. The ending of the latter may have broken this, though; the fans still argue about it. And ''Dream Drop Distance'' just complicates this even more; he retains a lot of his Dark powers, yet explicitly favors the Light (making the fans argue if it's even this or an outright subversion via "DarkIsEvil subdued by LightIsGood").
** During the last hit of the ''Eternal Session'' CombinationAttack, Sora and Riku charge their Keyblades with Light and Darkness, respectively, and crash them into each other for a superpowerful attack combining the two elements. Some of Riku's sleights in ''Re:Chain of Memories'' work the same way, just with Mickey channeling the light power instead of Sora.
** Xemnas uses a yin-yang bomb style of attacking in the final battle, throwing out beams of darkness and light. Xemnas even trades out his trademark black robe for a robe of black and white swirls.
** Roxas' element is Light, but as a Nobody he's technically a being of nothingness (though he still came into existence because of darkness's effects on his original self, as do all Nobodies). It's his two Keyblades that are a representation of the trope, the light-aligned Oathkeeper and dark-aligned Oblivion. Sora's Final Form also somewhat qualifies -- it symbolizes him manifesting Roxas' power, and his mostly black outfit takes on elements of Roxas' silver and white clothes, resulting in an outfit covered in white and black swirls. Artwork for Final Form also shows it with the Oathkeeper and Oblivion like Roxas.
** The Oathkeeper and the Oblivion [[WhatDoYouMeanItsNotSymbolic are obvious]] if [[BilingualBonus you know Japanese.]] The Oathkeeper's teeth are the kanji for "light", while the Oblivion's teeth are the kanji for "darkness". Also related is that both of Sora's best friends are each symbolized by these Keyblades; Kairi is light and is represented by the Oathkeeper (the keyblade has her lucky charm as a keychain and is obtained after he got a clue of where she was in ''KHII'') and Riku is darkness and is represented by the Oblivion (he has used the keyblade himself, and in both ''KH'' and ''KHII'', it is obtained after an encounter with him). This is supported by the fact that Riku uses the power of darkness to fight and Kairi is a Princess of Light.
** In the Final Mix version of ''Kingdom Hearts II'', Sora gets the Two Become One keyblade after defeating Roxas. The Keyblade itself is covered in silver, white, and black sections, symbolizing a combination of Sora's light and darkness (and his combining with Roxas). Its special effect is called "Light and Darkness", which causes him to, when he Drives, become either Final Form, as described above, or Anti Form, a shadowy Heartless-like Sora, no matter which (usually low-cost) Drive form you actually ''chose''. In this case, Final Form represents light, and Anti Form represents Darkness.
** In ''[[VideoGame/KingdomHeartsBirthBySleep Birth By Sleep]]'', Master Xehanort preaches the virtues of this path to Terra, telling him that Eraqus's way of shutting out and killing the darkness is just as wrong as succumbing to darkness entirely, and that the right way to protect the worlds is to wield light and darkness in equal measure. [[spoiler:He's full of crap. The possible truth of his statements notwithstanding, he's only telling Terra this so that he can get him to give into darkness. [[InformedAttribute His written intention for wanting to start the Keyblade War is to forge a new world with the two powers in balance, but thus far, he's only shown alignment with Darkness, and obsession with its power]].]]
** Also in ''Birth By Sleep'', the [[spoiler:χ-Blade]] is a Yin-Yang ''Sword'', forged by combining a heart of pure darkness with a heart of pure light.
** The Shadow Breaker command in ''VideoGame/KingdomHearts3DDreamDropDistance'' consists of two whirling slashes, the first dark element, and the second light. Both Sora and Riku can use it.
* ''VideoGame/TalesSeries'':
** The ending of ''VideoGame/TalesOfEternia'', in which [[spoiler:Reid and Meredy combine Seyfert's Light Aurora with Nereid's Dark Aurora to SaveBothWorlds]].
** Judas in ''VideoGame/TalesOfDestiny2'' wields a dark dagger and a light dagger. He also is proficient at both light and dark-type spells, which really doesn't make too much sense, as his elemental affinity is technically Earth. He can also wield wind spells as the yin yang to his earth proficiency.
*** In the same game, Harold has two elemental yin yang bombs in the form of Fire and Water and Light and Darkness.
** Shing (light) and Kunzite (dark) in ''VideoGame/TalesOfHearts'' have a CombinationAttack called ''Senanreppajin'' -- in kanji, "Flash Dark Tearing Break Sword". It's activated by synchronizing two of the best multihit elemental sword moves they have.
** In the [=PS3=] version of ''VideoGame/TalesOfVesperia'', Yuri and Flynn's combination mystic arte, Bushin Soutenha, has them team up and fire a beam of intertwined darkness and light at their victims.
** Richard from ''VideoGame/TalesOfGraces'' utilizes light and dark magic as his primary elements.
** Elise from ''VideoGame/TalesOfXillia'' combines dark based offensive magic with light based healing. She and Milla can use the aptly named Chaotic Fuser [[CombinationAttack link attack]], which forms a sphere of light and darkness around the victim that eventually explodes.
** In ''VideoGame/TalesOfBerseria'', Laphicet's second Mystic Arte, Chaos Bloom, has him combine light and darkness to create a shockwave that damages all enemies on the battlefield.
* Jak from ''VideoGame/JakAndDaxter'' gains both [[SuperpoweredEvilSide Dark Eco]] and [[TouchedByVorlons Light Eco]] powers over the course of the story. Though not referring to him directly, he is even told that "the two types, light and dark, when combined form great energies."
* ''VideoGame/{{Ikaruga}}'' is made of this trope. Enemies fire light-aligned and dark-aligned bullets at you, but your ship can switch between the two polarities at will, absorbing bullets of the same color, and causing double damage when firing bullets of the opposite color.
* ''VideoGame/MetroidPrime2Echoes'' introduced the Light Beam, a concentrated form of "the Light Of Aether" that makes life possible on the rogue body and the Dark Beam, a concentrated form of Dark Aether's [[DeathWorld toxic]], [[EverythingIsTryingToKillYou hostile]] atmosphere. The Luminoth then learned these two things were ideal for containing a matter-{{antimatter}} reaction and thus created the Annihilator Beam, which is the energy produced by said reactions, and outfitted onto a war machine known as Quadraxis. Samus obtains this particular weapon once she destroys Quadraxis. The light and darkness aspects of the annihilator beam are just as important, as shooting a Luminoth Light Beacon projects a field that both compels [[DemonicInvaders Ing]] to approach it and obliterates them on contact.
* The [[MineralMacGuffin Chaos Emeralds]]'s energies in the ''Franchise/SonicTheHedgehog'' games can become either positive or negative depending on the emotions used to draw them out. ''VideoGame/SonicAdventure'' culminates in the [[TrueFinalBoss epic clash]] between [[EldritchAbomination Perfect Chaos]] (empowered by negative energy) and [[SuperForm Super Sonic]] (empowered by positive energy).
* ''VideoGame/DevilMayCry'':
** Dante, with [[GunsAkimbo Ebony and Ivory]]. He uses both demonic and human weapons. In the third game, Vergil hates humans, and exclusively uses demonic weapons, and Lady hates demons, and uses ordinary human guns. Dante's usage of both types of weapons proves to be more powerful.
** The trope is played straighter in ''VideoGame/DmCDevilMayCry'', where Dante and Vergil are now half-demon/half-angels, and can use both angelic and demonic weaponry.
* ''VideoGame/GrandiaII''. Good and evil were necessary to win the game, as you had a holy priestess with you and an evil demon, both in the same person, and you, being the hero, were kind of the neutral mix of both. May also apply to the BigBad [[spoiler:who is both the pope of the same holy religion as the priestess, and embodies the same devil entity as the demon chick -- cranked up to 11, obviously]].
* Wisp of ''VideoGame/KnightsInTheNightmare'' has the power to switch the "Battle Phase" between Law and Chaos at will, which causes its Knights to execute different attack patterns. Also, the amount of PowerCrystal (required to [[LimitBreak Break Out]]) dropped by enemies depletes over time, but returns to full when the Phase changes, forcing Wisp to switch between the Phases in order to keep up the assault.
* In ''[[VideoGame/LegendOfLegaia Legaia II: Duel Saga]]'', the WhiteMage turns out to be a powerful sorceress, and the first special technique she masters is "Big Bang," which combines Earth, Wind, Water, and Fire, two sets of diametrically opposed elements, to create a powerful Light-elemental explosion. Her attack-line is actually "Power to Create! Power to Destroy!"
* Wes from ''VideoGame/PokemonColosseum'', with his Espeon and Umbreon.
* ''VideoGame/ShiningForce'':
** You need to get the Sword of Light and the Sword of Darkness to use as keys to get the Chaos Breaker, a [[SwordOfPlotAdvancement plot-important]] InfinityPlusOneSword.
** If you explore ''during'' Michaela's battle, you'll find the White Ring, Black Ring, and Evil Ring. Though it may not sound like it, the Black Ring is the YinYangBomb. It's cursed just like the Evil Ring, but it's the only ring that can only be equipped to the hero, and in battle it perfectly complements the White Ring. The Evil Ring is ''only'' a DiscOneNuke.
** ''VideoGame/ShiningTears'' has a system where you pair off in battle with a Light- or Dark- aspected partner, and your alignment is shifted to the opposite thanks to your Yin/Yang rings.
* ''VideoGame/SoulCalibur'':
** One of the weapons for a character was the "good" sword corrupted by the "evil" sword, while the other time, an immortal man brings the two swords together. Bad things happen as a result.
** And in ''Soul Calibur IV'', Talim's final weapons (she uses a pair of "elbow blades") are Soul Edge and Soul Calibur: one in each hand. Kilik's ultimate weapon is Embrace of Souls, a fusion of Soul Calibur and Soul Edge that leaves both swords inert (though still powerful), in staff form.
* ''VideoGame/CastlevaniaOrderOfEcclesia'':
** The Item Crash between a light glyph and a darkness glyph (except for Dominus) results in a literal, and very powerful, Yin-Yang Bomb. It's also a GameBreaker. 4 hits of that attack and within 10 seconds you've just beaten the final boss.
** [[spoiler:Albus]] also uses his "Balance Cannon Shot", firing a light projectile and a dark projectile which whirl outward in a helix. It hurts.
* ''VideoGame/StarCraft'':
** The [[NeglectfulPrecursors Xel'naga]] temple in ''VideoGame/StarcraftBroodWar'' requires both the Uraj crystal, powered by High Templar energies, and the Khalis crystal, infused with Dark Templar power, in order to activate and blow everything within a wide radius straight to Hell on the armageddon express.
** This wasn't the first time, either. Tassadar channeled High and Dark Templar powers simultaneously to [[HeroicSacrifice kill the Overmind]]. This is also very significant, as the last guy to combine both High Templar and Dark Templar energies was Adun (he used it to distract the Conclave and allow the Dark Ones to escape). As in "En Taro Adun." There's a reason they now say "En Taro Tassadar."
** The Twilight Archon in ''VideoGame/StarCraftII'' was planned to be this, a combination of a Dark Templar with a High (Light) Templar. Then the unit was replaced by the normal Archon, the only difference is that now it forms as a combination of any two Templar units regardless of their alignment. So it ''can'' be a yin-yang bomb, but doesn't have to be. The concept of the Twilight Archon being this trope was later adapted to the lore behind the Void Ray, which uses both forms of energy to power its WaveMotionGun.
** In ''Legacy of the Void'', Artanis would wield both a psy-blade and warp blade in battle, [[spoiler:though he only got the latter after Zeratul died]].
* ''VideoGame/BatenKaitos''
** The game inverts this trope. If a character chooses moves with opposing elements in the same turn, the elemental damage cancels out, and the combined result is weaker than an equivalent turn made from moves with non-opposing elements. Two characters, Lyude and Savyna, have offensive abilities focused on conflicting element pairs (light and darkness for Lyude, fire and water for Savyna), making them difficult to use effectively.
** The prequel, ''Baten Kaitos Origins'', plays this straight by revamping the combat system. Several EX Combos use elements opposed to each other, including Guillo's tremendously powerful light and darkness combos.
* ''VideoGame/{{Boktai}}''
** Django is of both Solarian and Lunarian blood, which lets him wield light while being extremely resistant to darkness. Nevertheless, he's bitten by a vampire [[spoiler:(specifically, his father)]] in the second game and becomes "half" vampire. He gains enough control that he can shift between normal and vampire mode at will. This symbolism is broken in the [[NoExportForYou third game]] where his KarmaMeter decreases the more he uses his vampiric self.
** Done straight in the final boss of the first game and the second to final boss of the second game where [[spoiler:both Django and Sabata use their respective Light and Dark guns to power the pile driver and use the Wild Bunch attack]], and in the second game where [[spoiler:Sabata uses his black hole attack to pin down a strong and agile boss so Django can use his Gun Del Sol and deal a lot of damage]].
** Also done straight in ''Boktai DS'' (''Lunar Knights''), where the entire point is for Django and Sabata to work together.
* ''VideoGame/KnightsOfTheOldRepublic''
** Jolee Bindo is a Grey Jedi, and uses Light and Dark powers interchangeably.
** An even better example is [[VideoGame/DarkForcesSaga Kyle]] [[MemeticBadass frickin' Katarn]], who can very well be considered a Gray Jedi. One of the first things he taught to his pupils was that the powers they use are neither good nor evil, it's how they use them that is important. The one apprentice who took that lesson to heart has beaten an ancient Sith Lord in single combat.\\\
[[WordOfGod Lucas]] implies that fueling your Force powers with emotions (i.e. giving into the Dark Side) amplifies said emotions, making you give into them a bit more every time instead of just using them as a power source. That's what makes the Dark Side so dangerous -- you ''will'' go [[DrunkWithPower mad with power]], and the more confident you are in your 'control' over them, the faster this happens. As for "Light" and "Dark" Force powers, they're more a staple of philosophy (protect vs. attack) that's more likely to employ them (and thus rely more on the Light or Dark) than specifically a tool of either Side. It just happens that lashing out with emotion makes for a stronger attack, hence the association.
** You can use the Player Character as one in ''Knights of the Old Republic'', though it is rather difficult to throw around light-side buffs and neutral or dark-side attack powers unless you are a Consular with maxed Wisdom and so many force points it isn't even funny. In an aversion of this trope, though, trying to rely on both makes you weaker than focusing on either, because of Side penalties, as well as powerful Side-specific items. Without them, it would be played straight. [[spoiler:The canon version of the character takes it to the extreme of being both a light side master and a dark side master instead of grey, which shouldn't even be possible.]]
* In ''Franchise/StarWars: VideoGame/TheForceUnleashed'', Starkiller seems to combine Lightside and Darkside techniques in battle.
* This is a feature of an optional character in ''VideoGame/ChronoCross'', Pip/Tumalu. You can evolve him as light/light, dark/dark, or light/dark (or dark/light, works the same way). The third is often considered the best standalone. [[spoiler:Also, to get the GoodEnding, you have to pull this trope off with all three Element colour conflicts (white/black, red/blue, yellow/green; these represent light and space/gravity and hell, fire and lava/water and ice, and earth and lightning/nature and wind.]]
* In ''VideoGame/SeikenDensetsu3'', you get two class changes per character. Similar to the VideoGame/ChronoCross example above, each time you class change, you can pick either the Light or the Dark advance from your current class, leading to Light-Light, Light-Dark, Dark-Light, or Dark-Dark.
* A long part of ''VideoGame/{{Albion}}'''s gameplay requires the player to retrieve two scrolls that together, hold the knowledge to combine magic and technology, which are polar opposites of each other. The end result is [[spoiler: a magical seed that can absorb nuclear energy and grow into an entire jungle in just a few minutes, spurting vines strong enough to crush an otherwise indestructible supercomputer, and overgrow the mining facility it controlled.]]
* ''VideoGame/{{Touhou}}'':
** Reimu's Yin-Yang Orbs are likely the most literal example of this trope one will find.
** Yukari's power over boundaries seems to be all about this. "Mesh of Light and Darkness", "Curse of Dreams and Reality", "Balance of Motion and Stillness", etc, etc. So basically her power is a myriad of different [[YinYangBomb Yin-Yang Bombs]].
* Dante from ''VideoGame/DantesInferno'' uses the holy cross and the infernal deathscythe.
* ''VideoGame/HeroesOfMightAndMagic''
** An unintentional example is used to explain the change of setting between the third and fourth games. Gelu wields a FlamingSword, the Armageddon's Blade, in battle against Kilgor, who wields his own magical weapon, the Sword of Frost. When the two swords strike one another, they unleash a destructive magical shockwave that [[ApocalypseHow almost destroys the planet]].
** In ''IV'', Nature magic focuses on summoning animals and magical beings and buffing allies, while Death magic focuses on cursing enemies and resurrecting slain creatures as undead. Using both in combination allows the summoning of demons. The protagonist of IV's Death campaign, Gauldoth, is able to do this.
** In IV's expansion ''The Gathering Storm'', one of the protagonists uses [[OrderVersusChaos order and chaos]] magic together, and his campaign involves seeking a Yin-Yang-related artifact that will power both. Another protagonist is able to use a combination of WhiteMagic and [[{{Necromancer}} necromancy]].
* ''VideoGame/WorldOfWarcraft''
** Balance-specced druids switch back and forth between solar- and lunar-based spells as one of their main mechanics. Their signature move, Starsurge, is a powerful blast formed by fusing the power of the moon and sun.
** Priests have holy spells to heal and buff allies or smite enemies (powers that come from the [[LightIsGood Light]], but also rather evil-sounding shadow spells that can [[AgonyBeam inflict extreme pain on enemies]] or [[MindRape liquefy their very mind;]] these Shadow powers come from an [[EldritchAbomination Old God]]. They can switch between Shadow and Holy magic at will, but only Discipline priests use both at the same time; in the 2016 expansion, ''Legion'', they abandon their former specialty of being a BarrierWarrior to focus on this combination.
* ''VideoGame/ChronoTrigger'' has the Antipode dual-tech chain (Antipode Bomb in the DS remake) created by combining Marle's ice magic and Lucca's fire magic. (It deals shadow-type damage, like all multi-element combos.)
* ''VideoGame/{{Mardek}}: Chapter 3'' has Zach's strongest attack, "Immoral Injustice," which deals large amounts of damage to both light and dark elemental foes. The animation looks like a yin-yang. His strongest weapon is a double-bladed sword called "Yin and Yang."
* ''VideoGame/ManaKhemia2FallOfAlchemy'' has this as the ultimate CombinationAttack of the two leads, Raze and Ulrika (who were granted powers by the Light and Dark Mana, respectively).
* The XBLA BulletHell-infused PlatformGame ''VideoGame/{{Outland}}'' is based around this.
* In ''VideoGame/ArcRiseFantasia'', both Dynos and Cecile have an Excel Act each (Doubly Dark and Light and Dark!, respectively) that merges a mass of light and darkness together to form a huge combined [[KamehameHadoken beam]]. Apparently it's a "forbidden art".
* ''VideoGame/{{Magicka}}'' gives you lots of opposites. While combining them yourself is impossible, you and another sorcerer can combine opposites (for example, Life and Arcane), which will generate a devastating [[StuffBlowingUp Antipodal Blast.]]
* In ''VideoGame/DragonAgeOrigins'', you run across quite a few Darkspawn Emissaries and Blood Mages with skill in healing in addition to their [[BlackMagic darker powers]], which makes them much more obnoxious to fight since they've got the Creation-school healing to let them keep throwing out the Entropy-school hexes for longer. This is partly due to GameplayAndStorySegregation; in theory they aren't using the player schools at all, but Blight magic with similar effects.
* In ''VideoGame/DemonsSouls'', the greatswords Soulbrandt, which becomes stronger if its wielder's soul is demonic, and Demonbrandt, which becomes stronger if its wielder's soul is untainted, can be forged together into the Northern Regalia, a greatsword that is at its strongest if its wielder's soul is purely demonic ''or'' untainted.
* In ''VideoGame/TalesOfPhantasia'', Cless must find the [[FlamingSword fire-aligned Flamberge]] and the Vorpal iceblade, and forge them together into the [[SwordOfPlotAdvancement Eternal Sword]].
** Whereas in distant prequel ''[[VideoGame/TalesOfSymphonia Symphonia'']] Lloyd simply [[DualWielding Dual Wields]] both swords as the eternal sword.
* ''VideoGame/UniverseAtWar''
** Where the [[PlanetLooters Hierarchy]] have HumongousMecha [[BaseOnWheels Base on Legs]] and the [[MechaMooks Novus]] have [[TeleportSpam lightning fast mobility with the use of flow networks]], the [[AncientAstronauts Masari]] has this as their gimmick. They can actively switch between Light and Dark at any time, albeit with a small cooldown upon switching. Light is geared for offence while Dark is geared towards defence. Managing between the two modes is key in winning battles when playing as them. A good strategy is to use Dark mode when base building and scouting, then switch to Light mode when attacking enemy bases or defending against Hierarchy Walkers.
** This is played much more straight with the Balance branch, which utilizes both Light and Dark to create a very stealthy army. Special mention goes to the hero unit unlocked from this branch, Prince Zessus, a HalfHumanHybrid who can balance, combine and control the powers of Light and Dark to create immense energy no other Masari can ever harness without even [[WithGreatPowerComesGreatInsanity losing control]]. He's able to do this by balancing the nobility of a Masari (inherited from his mother, Queen Altea) and the [[HotBlooded hot-bloodedness]] of a human (inherited from his father, a human). He does struggle to balance between the two at times however. As much as he is an overall nice guy and a noble person, he is pretty brash and tends to be a LeeroyJenkins due to sheer [[HotBlooded hot-bloodedness]].
* In the ''VideoGame/ShadowHearts'' series, both Will, magic that governs the soul, and Malice, magic that governs the body and primal instincts, are required to perform a successful resurrection with the Emigre Manuscript's rituals. Most of the resurrections attempted in the series failed because the users used too much or not enough of one or the other.
* Taigong Wang from ''VideoGame/WarriorsOrochi'' produce Yin-Yang marks after using his C2, C3, or C5 attacks. Activating his special attacks will make them explode.
* "Shadow" enemies in ''VideoGame/AdventureQuest'' use Darkness and Light attacks and take reduced damage from both. During the quest chain that features them players can obtain rewards that let them wield similar powers.
* In ''[[VideoGame/StreetPassMiiPlaza Find Mii 2/Streetpass Quest 2]]'', you can have Miis of the same or similar color shirts team up, like a team of Blue-Blue miis or a team of Blue-Light Blue miis, though miis with the same color shirt are a better team. The exception is a mii wearing a white or black shirt, they can team up with other miis of the same color shirt like White-White or Black-Black, or team up with each other despite wearing opposite colors to form a Black-White team. And while they don't have a Combo Magic command like they would if the team had the same color shirts, their Combo Attack command is the only thing that can break Shadowlight shields, whereas most other shields only require a single mii wearing the required shirt.
* In ''VideoGame/IllusionOfGaia'', Dark Knight Will fuses with Light Knight [[spoiler: Kara]] to destroy the CometOfDoom.
* The boss Orthros in ''VideoGame/BravelyDefault'' is a two-headed dog with one head that breathes fire and one that breathes ice. While both heads are active, they can combine their powers to produce "Blazzard", a devastating NonElemental attack.
* {{Discussed}} in ''VideoGame/AlanWakesAmericanNightmare'' by HeavyMithril FakeBand [[Music/PoetsOfTheFall Old Gods of Asgard]] in their song "[[https://youtu.be/b6RKKCQt82Y?list=PLjACqN5i5sDUo3MfGtqogz7P3u5JUm3c- Balance Slays the Demon]]," as an in-universe attempt by the band to steer the protagonist toward defeating the game's villain via lyrical metaphor.
-->''Ever the light casts a shadow''\\
''Ever the night springs from the light''\\
''In the end, it's never just the light you need''\\
''When balance slays the demon, you'll find peace''\\
''In the end, it's never just the dark you seek''\\
''When balance slays the demon, you'll find peace''
* ''VideoGame/GoldenSun'': In the second and third games, one of the optional summons is Ulysses (who's a mage for some reason) who sends magical flying jaws at enemies and requires two Mars and two Mercury Djinn. Other summons that require different amounts of opposing elements are Flora (earth and wind, attacking with petals) and Iris (fire and water to send enemies into the Sun).
* In the ''Videogame/{{Diablo}}'' series, the reason that HumansAreSpecial is that they are the offspring of forbidden relationships between angels and demons, and as a result display a blend of traits which cannot be found in either of their parent races. While demons and angels are both compelled to follow particular behaviours, humans have free will and the ability to choose between good and evil, and the most powerful humans are able to ScrewDestiny.
* ''Franchise/TheLegendOfZelda'':
** The Gerudo in VideoGame/TheLegendOfZeldaOcarinaOfTime. The Spirit Temple is about the interplay of light and shadow; the witches who rule it, Koume and Kotake, use fire and ice.
** [[SorcerousOverlord Ganondorf]] acquired more of a note of pairings-of-opposites as the series went on. In the first three games, he was [[RedAndBlackAndEvilAllOver mostly just demonic]]; but in ''Ocarina of Time'' he uses a lot of lightning magic, and in ''Twilight Princess'' he wields a corrupted holy sword.
* ''VideoGame/SuperRobotWarsX'': Zelgard's final attack involves [[spoiler:both protagonists who are together casting their dogma to create this effect.]]

[[folder:Web Animation]]
* In the ''Franchise/SonicTheHedgehog'' fan flash movie ''WebAnimation/NazoUnleashed'' this trope is invoked against the eponymous [[BigBad Nazo]] in his Perfect form. After both Super Sonic and Dark Super Shadow get soundly curbstomped one after the other, [[TheHero Sonic]] (light) and [[AntiHero Shadow]] (...well, shadow) use Chaos Control to [[FusionDance merge into]] Hyper Shadic, who proves strong enough to challenge the "darkness" that is Nazo.
* ''WebAnimation/{{Dreamscape}}'': Keedran can use evil magic in her monstrous form, and holy magic in her true form.

[[folder:Web Comics]]
* At the end of the "Storm of Souls' arc, Webcomic/DominicDeegan has to fight Celesto Morgan, the Champion of Chaos and Darkness. Celesto assumes that Dominic is the appropriate counter for him -- the Champion of Law and Light. But no, he is the Champion of Balance, imbued equally by Light (thanks to his brother, Gregory, a powerful White Mage), Law (through Klo Tark, a master of mind-magic), and Dark (through the AntiHero Necromancer, Rillian). When Celesto strikes him with an attack concentrating the pure Chaos of the Storm of Souls, Dominic [[http://www.dominic-deegan.com/view.php?date=2005-04-11 absorbs it]]. However, it's soon revealed he needs to take it a step further by gaining the physical elements -- which [[spoiler:Leafette's HeroicSacrifice]] provides him.
* ''Webcomic/{{Sinfest}}'' depicts the Buddha as a cheerful {{Cloudcuckoolander}} that confounds God and the Devil alike.
* Pella in ''Webcomic/LookingForGroup'' gives Cale a gift of two swords, named Good and Evil. [[http://www.lfgcomic.com/page/377 Cale represents the balance between them.]] Also significant is that the swords were forged from the remains of the sword of Truth (no, not that Literature/SwordOfTruth).
* ''Webcomic/TowerOfGod''. FUG's signature move, the Hwa Jeop Gong Pa Sul is based on using to opposing forces of Shinsoo at once to create a devastating attack.
* ''Webcomic/{{Homestuck}}'' has the [[http://www.mspaintadventures.com/?s=6&p=005559 Tumor]], a literal Yin-Yang bomb with an explosion encompassing about the combined mass of two universes.
* ''Webcomic/ChampionsOfFaraus'' for the climactic battle of #1 "''The first one''"'s story arc, Leilusa, a godess of shadow,and Hyperion,a god of light, have [[spoiler:Flamel]] use rune magic they set up to fire a combination shadow/light attack at [[spoiler: the cultist who has merged themselves with several durable/dangerous spirits]].While the two magics swirl around each other while moving,the result upon impact is an explosion.
* In ''Webcomic/SlightlyDamned'' fire demon Buwaro and water angel Kieri did this by accident. Kieri was showing Buwaro a spell for making bubbles and when Buwaro tried blowing a bubble with her, he used his fire breath, with resulted in them making a bubble with a flame inside it, which hit Tsavo and exploded.

[[folder:Web Original]]
* Centigrade, a superhero from the ''Roleplay/GlobalGuardiansPBEMUniverse'' uses both [[AnIcePerson ice-based powers]] and [[PlayingWithFire fire-based powers]] to fight crime.
* In ''WebAnimation/MarioBrothers'', the lava unnaturally erupting from Koopa's castle was the result of Koopa's dark magic and Toadstool's own magic mixing when they both fell into the lava.

[[folder:Western Animation]]
* Equinox's schtick in ''WesternAnimation/BatmanTheBraveAndTheBold'', going as far as wearing a Yin-Yang symbol on his chest. His costume was half black and half white, and he tried to maintain the balance between Chaos and Order (naturally going insane in the process).
* ''WesternAnimation/AvatarTheLastAirbender'' explains this is how lightning generation in Firebending is done. Iroh says that one must separate the Yin and Yang on one's body, and when they come back together they create an explosion of energy that can be redirected as lightning to the cool and focused mind. [[spoiler:When Zuko tries this, he promptly finds that his own rage and passion backfire on him. Literally.]]
** Weirdly broken in the SequelSeries ''WesternAnimation/TheLegendOfKorra''. Raava and Vaatu are shown as spirits of light/peace and darkness/chaos respectively and in eternal conflict over which one dominates making them mutually exclusive. The broken part is that they strongly invoke yin-yang symbolism (to the point of turning into the symbol briefly) but the whole point of the yin-yang ideology is harmony rather than conflict. The series ends with Raava victorious over Vaatu, which outright turns into CriticalResearchFailure.
* In ''WesternAnimation/MiraculousLadybug'', we have the Ladybug and Black Cat Miraculouses, which grant their wielders the powers of creation and destruction, respectively. When one wields them together, they give the power to [[RealityWarper warp reality]], though this apparently comes with a price.

[[folder:Real Life]]
* Most of the universe is composed of Matter. {{Antimatter}} is its exact opposite. Mixing the two will invariably result in annihilation, a technical term meaning all their mass is converted to energy . Keep in mind that the energy of an object is the mass multiplied by the square of the speed of light (E=mc^2). You get a very big boom. Fortunately, most of the anti-matter in the universe seems to have exploded already. For a long time, this was one of the great mysteries of physics. Theoretically, the amounts of matter and antimatter in the universe should have been equal, resulting in complete annihilation of the universe.
* Thermal shock: super-heat a piece of glass or ceramic, and then quickly introduce it to extreme cold, and watch what happens. Ideally you should be wearing eye protection when you do this.
* Lightning forms due to differences in positive and negative charges within clouds.
* Some daring, bored, or just [[TooDumbToLive plain stupid]] souls mix together substances with depressant & stimulant qualities for a different & more intense kick, ranging from your average Vodka Red Bull or whatever cocktails with caffeine in it to speedball, heroin & cocaine in one syringe. Of course, it's far riskier than the sum of its components as the conflicting effects makes it harder to realize that an overdose is happening.