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-> [[WithGreatPowerComesGreatInsanity "If you only knew the power of the]] [[TropeNamer Dark Side!"]]
-->-- '''[[TheDragon Darth Vader,]]''' ''Film/TheEmpireStrikesBack''

The EvilCounterpart, corruption or evil sides of the SentientCosmicForce...and a good number of non-sentient, non-cosmic forces as well. Evil is addictive; the more of its power you rely on, the more evil you become. The Dark Side is when the [[FaceHeelTurn temptation to fall]] has an added ''oomph.'' It's more than just the cumulative result of one's actions; there's [[TheCorruption a corrupting force that speeds things along]]. This is often the [[AppliedPhlebotinum Phlebotinum]]-powered justification of JumpingOffTheSlipperySlope, which results in the Fallen [[TheDarkSideWillMakeYouForget forgetting why they fell in the first place]]. The Dark Side often promises [[EvilFeelsGood pleasure]] with [[AmbitionIsEvil power]] and [[EvilIsCool respect.]] Sometimes, the Dark Side even offers itself as the efficacious means to do good, leading to the hero falling to a HeWhoFightsMonsters situation. Once it gets you, there's an odd tendency to [[EvilCostumeSwitch accessorize accordingly.]]

Like MoreThanMindControl, it accelerates the more [[EmotionsVsStoicism suppressed urges]] and wrong choices it has to work with.

May be fueled by an ArtifactOfDoom. May grant BlackMagic and work through TheDarkArts. May result in TheHeartless. Once it [[EvilTastesGood starts to taste good]] there's no turning back.

The trope is named after the dark side of TheForce from ''StarWars''.

It's a component of PsychoactivePowers; [[PapaWolf protective]] [[MamaBear instinct]] is harder to tap on demand than [[UnstoppableRage righteous fury]], but anger tends to feed on itself, resulting in PowerIncontinence.

Of course, there are often also [[ThisIsYourBrainOnEvil social, mental]], [[BeingEvilSucks moral]], and sometimes [[TheCorruption physical costs]] that no amount of [[GlamourFailure subterfuge can fully hide]] but by the time these aspects appear, it's too late.

Contrary to what the WellIntentionedExtremist and AntiHero [[ItsTheOnlyWay might say]], you ''cannot'' [[EvilVersusEvil "fight the Dark Side with the Dark Side"]] -- HeroicWillpower notwithstanding, the consequences will inevitably lead to the user's PyrrhicVillainy.

Compare WithGreatPowerComesGreatInsanity. Often leads to displays of DrunkOnTheDarkSide and shouts of "ScrewTheRulesIHaveSupernaturalPowers" Also compare EvilIsNotAToy, where the danger is not moral, but physical. Opposite TheForce. The Dark Side tends to be, but is not always, associated with Discipline in HarmonyVersusDiscipline for its dominating aspects. Contrast DarkIsNotEvil. The Dark Side comes with its own built-in [[AnAesop Aesop]] about the ends not justifying the means. See also TheDarkSideWillMakeYouForget, a scenario where a once well-meaning good guy uses the dark powers for good ends, and over time becomes a villain in the process.

[[noreallife]]
----
!!Examples:
[[foldercontrol]]

[[folder:Anime & Manga]]
* Many characters in ''Anime/YuGiOh'' and ''[[Anime/YuGiOhGX GX]]'' fall into some Dark Side's trap, usually by trying to use an ArtifactOfDoom or something PoweredByAForsakenChild (i.e. Marik, Dartz, Akunadin, Saiou, Judai), sometimes with good intentions (Yami Yugi used the Seal of Orichalcos partly to save his Dark Magician Girl, Fubuki used his SuperpoweredEvilSide to try to save Ryo). They start confident they'll be able to control what they unleash, but inevitably, the power's/object's inherent darkness is controlling them.
** [[LightIsNotGood Light]] can function the same way. A [[EldritchAbomination malignant celestial radiance]] known as the Light of Destruction tried to destroy the world via brainwashing cult in Season 2. Even after its defeat, it continued to be referenced thereafter as one of the most dangerous forces in existence.
* Used straight and subverted in ''Manga/{{Bleach}}'': gaining Hollow powers raises people's upper power (it is stated that shinigami have a maximum power they can attain) and allows them great spiritual growth. But it also risks giving into your SuperPoweredEvilSide for a world-class FreakOut. The Vizard thoroughly beat their dark sides into submission in order to access the power safely, and teach others in their dilemma how to do the same; however, not all people who gain Hollow powers ''want'' to suppress The Dark Side.
* ''Manga/MahouSenseiNegima'' has Negi learning BlackMagic so that he'll be able to protect his students, and it's implied that there's a real risk of the power taking control.
** It's also used more humorously, as Evangeline will attempt to "turn Negi to the dark side'' whenever the opportunity presents itself. It hasn't worked yet.
*** She touches this with almost everybody she comes into contact with, and has noticeably affected some of them (including Negi) -- the catch is that this setting weighs heavily on the side of DarkIsNotEvil. Her [[NobleDemon version]] is more aesthetic choice and [[LonersAreFreaks antisociality]] with Dark Side corruptive qualities than what the (other?) villains in the series possess.
[[/folder]]

[[folder:Comicbooks]]
* This trope -- well, its subtrope ClothesMakeTheManiac, anyway -- was, oddly enough, not actually present in the original Black Costume ''Comicbook/{{Spider-Man}}'' story, but [[LostInImitation appears in all adaptations thereof]].
** ''Does'' appear, however, in an issue of ''[[ComicBook/{{What If}} What If...?]]'' in which the symbiote latches on to the Punisher after Spider-Man rids himself of it, and attempts to corrupt the Punisher into killing Spider-Man. Subverted, however, in that the Punisher -- who is already [[AntiHero a pretty dark character anyway]] -- is having none of it, manages to gain control of the symbiote, and informs it that if it ever tries to make him hurt an innocent again, he'll kill them both.
* In Marvel's ''Comicbook/WorldWarHulk: X-Men'', Cain Marko succumbs to the lure of being an unstoppable force once again, and his own innate desire for destruction, which leads to his return as The Juggernaut of old by fully embracing the power's evil nature.
* In ''ComicBook/FearItself'', [[ComicBook/XMen Colossus]], in a desperate bid to save the X-Men from a jacked-up Juggernaut, absorbed the Cyttorak crystal into his own body, becoming the new Juggernaut. He is now struggling to hold on to his humanity and prevent Cyttorak from completely possessing him. [[spoiler: Judging from some previews of ''ComicBook/AvengersVsXMen'' it's going to be a losing battle...]] All of this turns out to have been [[spoiler:his own sister Magick's scheme to make him realize that she isn't his innocent little sister anymore. By allowing him to be Juggernaut for a while (she could have freed him at any time with her own powers), she made Colossus experience firsthand how the Dark Side changes people.]]
* The Shun Leep martial arts style from ''ComicBook/GoldDigger'' is so badass it has its own dark side for those who don't have the self control to master the higher techniques. It's not even a magic-related style! It just makes fighting so euphoric, and actively addictive, you stop caring about little things like 'whether your opponent lives'.
* We must mention Jack Kirby's enduring creation ''{{Darkseid}}'', the local [[AnthropomorphicPersonification incarnation]] of... well, The Dark Side.
* From Comicbook/GreenLantern, we have several examples.
** Parallax, the living enbodiment of fear, who corrupted Hal Jordan into a maniac, and tried to do the same to Kyle Rayner.
** {{Sinestro}}, who was corrupted- not by Parallax, but by trying to bring order to his home planet by creating a fascist rule. He later allied himself with Parallax to try bringing order to ''the entire universe''.
** The Red Lantern Corps, whose rings are powered by the wielder's own rage.
** The Star Sapphires are powered by love, with much the same addictive effects.
** The Orange Lanterns whose powers are derived from greed, and the Black Lanterns the "darkest" of the Lantern Corps in general, being dedicated to death and darkness, with all its members being undead.
*** Subverted and averted with the Orange and Black Lanterns respectively. The Orange Lanterns are nothing but energy constructs that take the form of Agent Orange's many victims. Then again, all of them were beings driven by greed in the first place, which is what drew Agent Orange to them, so it still sort of fits. Agent Orange himself is a prisoner of his own power, hopelessly addicted to it and unwilling to ever let go of the Orange Lantern Battery [[spoiler: which contains Ophidian the Greed Entity]] despite the unending hunger it inflicts upon him. The Black Lanterns are nothing but corpses animated by the rings themselves which are all mere extensions of Necron's will. There's no trace of the people that used to be those bodies.
[[/folder]]

[[folder:Film]]
* Anakin Skywalker/Darth Vader is by far the most famous ''Franchise/StarWars'' example, but there are plenty of others in the [[Franchise/StarWarsExpandedUniverse Expanded Universe]]. (See also under video games.) According to the source material, the Dark Side is powerfully addictive, since not only does it give you visibly stronger powers (at first), it also is a tremendous rush: it doesn't just feed off of negative emotions, it enhances them to some degree, and the more you use it the more susceptible you are to continued use, like an addict. There's plenty of evidence to show it can be resisted and fought off, but that's like asking a recovering heroin addict to hold onto some heroin for awhile: you ARE taking a chance that he will use it.
** The Dark Side is also shown to be physically destructive to those who use it past a certain point. Using Force Lightning caused Palpatine to be disfigured into the familiar, warped condition of the Emperor from the original trilogy, and Anakin's skin and eyes were severely discolored before his final duel with Obi Wan.
[[/folder]]

[[folder:Literature]]
* Anyone who gets near (much less uses) [[ArtifactOfDoom the One Ring]] in ''Literature/TheLordOfTheRings''. [[TheCorruption Gollum is the example]] [[WithGreatPowerComesGreatInsanity of how far things can go.]]
** In ''TheSilmarillion'' Sauron [[WellIntentionedExtremist started out with good and intelligent intentions]], but once he had begun supporting Morgoth as a means to an end, he was slowly corrupted until he became the [[EvilOverlord utterly inhuman force of evil]] seen in ''TheLordOfTheRings''. History then repeats itself with [[BigBadWannabe Saruman.]]
** Same really applies to anything evil in the whole mythos this side of Morgoth, which seems to be the "root evil" of sorts. Which raises interesting questions about Ilúvatar's motives in creating him and not stopping him (it's difficult to believe he was truly deceived or powerless to), but that's neither here nor there. As stated, practically every other evil character, or character committing evil acts, is subject to the Dark Side Temptation. Sauron wasn't the only Maia he tempted, and a case could be made for many Humans and Elves throughout the story.
*** It's quite clear in the ''Silmarillion'' that Morgoth was not created evil. Melkor is clearly an {{Expy}} of Lucifer, and is described as the greatest of the Valar. Like Lucifer, [[AGodAmI his pride got the better of him]], and he attempted to remake the Song of Ilúvatar in his own image. And, like Lucifer, [[TurnedAgainstTheirMasters he rebelled against his creator]], and was cast out; losing his original name and [[{{Satan}} being given a new, less complimentary one]].
* Violation of the Seven Laws of Magic in ''Literature/TheDresdenFiles'' causes this, especially things that harm other people like mind control, Outsider summoning and murder-by-magic. It not only corrupts your soul but eventually drives you insane with power-hunger (assuming that the Wardens don't kill you first - at first you think that's the Wardens being draconian and cruel, but it turns out the laws and their [[OffWithHisHead one punishment]] exist because once you do certain things, you ''will'' get worse and worse and it won't matter what your intention was when you started. They don't ''like'' the fact that the best way to keep the body count down is to get out the ax when the violator is still a poor kid who broke a law once without knowing about the laws or council or wardens, but it is. The council basically answers "yes" to "knowing what was coming, would you kill Hitler while he was stilll a baby?").
** More personally, Harry is constantly tempted to use Fallen power by Lasciel, who wants him to pick up her coin and become a Denarian. At one point he even quotes Gandalf at her to emphasize why he refuses.
** The Denarians are perfect living examples of falling to The Dark Side. They're evil through and through because of their greed for power, and they live symbiotically with demons from hell (in the literal Christian sense).
** The only member of the White Council that is allowed to violate the Seven Laws is the Blackstaff. This is because the Blackstaff (magical staff) wielded by the Blackstaff (the position) prevents The Dark Side from corrupting its wielder.
* In ''The Tennis Shoes Adventure Series'', there's a demonic sword, created by an evil king from The Book of Mormon. It would slowly work its way into someone's mind, convincing them they could use it to become powerful. Through the use of TimeTravel, Todd Finlay got a hold of it and turned to The Dark Side. Later on, Joshua Hawkins, son of TheHero gets seduced by it as well.
* The so-called True Power of ''TheWheelOfTime'' is highly addictive. Only the very upper echelon of the Dark One's flunkies are allowed to use it, and only one of them does so on a more than completely desperate basis, as they're all afraid of the side effect: [[WithGreatPowerComesGreatInsanity going utterly around the bend]] (the one who ''does'' use it is already nuts and a major nihilist to boot- he doesn't care about the consequences]].
** ''Saidin'', the source of power for male magic users, is also considered to be this in-universe, but that's because the Dark One managed to layer corruption over it, causing anyone who uses it for long to go completely AxCrazy and then die a horrible death that's never seen, but described as being essentially [[BodyHorror rotting while you're still alive]]. Late in the series, [[TheHero Rand]] maanges to fix it.
* Oddly enough the phrase "dark side" is used a couple of times in ''Literature/HarryPotter'', but it doesn't really have any examples of the trope: Voldemort was [[AlwaysChaoticEvil evil from the start, as were the Death Eaters.]] The good guys also use spells considered evil at various points with no repercussions, so apparently magic truly is just a tool, and it all depends on how it's used. Despite this, some branches of magic are clearly classified as [[BlackMagic "the Dark Arts"]] and [[DangerousForbiddenTechnique their use is proscribed.]]
** The creation of Horcruxes may qualify, since it involves the ''deliberate mutilation'' of the ''soul'', and consequent loss of humanity/sanity. Of course, the question does then arise of why Voldemort was the only person in history to create multiple horcruxes. More than one fanfic author has ascribed this to Voldemort screwing up the first horcrux, and putting vastly more of his soul into it than he ever intended.
** Although they were not good to start with, Severus Snape, Regulus Black, and Draco Malfoy are all examples of characters who liked the ''idea'' of the Dark Side, joined the Death Eaters at the first chance, and had gotten too far in before they [[HeelRealization realized what it was really like.]]

* The Dark Court from ''WickedLovely''.
* In the [[TheLegendOfDrizzt Drizzt]] novels by R.A. Salvatore, the Crystal Shard is frequently presented as being made of the Dark Side. So too the sentient sword Khazid'Hea. The Crystal Shard is an interesting and somewhat tragic case, since the true source of its corrupting influence isn't from the evil beings that created it (whom it consumed), but from the lingering sorrow and torment of a ruler who tried and failed to protect his kingdom from invaders with the Shard's power.
* In Randall Garrett's ''Literature/LordDarcy'' universe, practicing Black Magic for any amount of time will result in this.
* In Mercedes Lackey's [[Literature/HeraldsOfValdemar Valdemar Universe]] there are hints that the ancient Big Bad Ma'ar may have started out this way.
* In A.L. Phillips's Literature/TheQuestOfTheUnaligned, [[DarkIsEvil elemental Darkness]] is inextricably entangled with each of the four elemental magics, and mages [[spoiler: except for the orahs, who "live aligned with light alone"]] constantly have to fight its pull. [[spoiler: Additionally, it is possible under certain extreme circumstances to become a hoshek, a mage aligned with pure darkness. This grants almost unlimited power, at the cost of becoming completely psychotic and utterly evil. The last hoshek to be created destroyed half of Caederan before finally being defeated.]]
[[/folder]]

[[folder:Live-Action TV]]
* In ''CaptainPowerAndTheSoldiersOfTheFuture'', Lyman Taggart wanted to use the supercomputer Overmind to end the ongoing war being proliferated by the Biomechs, but was seduced by the seeming perfection of machines, inevitably becoming the infamous Lord Dread and the very thing he was fighting against. His occasional doubts are dissuaded by Overmind, who brainwashes him with the propaganda of their cause.
* The Wraith Enzyme in ''Series/StargateAtlantis,'' though Ford has yet to venture into full-on Darth Vader territory.
** And probably never will, because his character has seemingly been forgotten by characters and writers alike.
*** While they NeverFoundTheBody, the implication that Ford died in his last appearance was fairly obvious. They left just enough of an opening for him to be brought back if the writers decided to do so, but they never did.
* Willow in season 6 of ''Series/BuffyTheVampireSlayer'', when she abandons all restraint from using magic, even BlackMagic.
** Subverted in that [[spoiler: you have to go through the Dark Side, survive (not explode) and come out the other end to be on the real Light Side]].
** Also, in season 3, Angel warns Faith "You don't know the price of evil". Her response: "I hope evil takes [=MasterCard=]".
** Angel's conversions to Angelus don't count as they are instant and involuntary. But he goes dark in season 2, in a tantrum over not being able to save Darla. For example, he lets a room full of lawyers get eaten by vampires. That's dark, isn't it? Isn't it?
*** Well, they ''are'' [[AcceptableTargets lawyers.]]
** The point behind Angel and the gang being recruited to run LA branch of Wolfram and Hart in Season 5 is basically this troope, even if they insist that they did so to do good. It is strongly implied (and occasionally stated more or less explicitly by several characters) that the Senior Partners want Angel (and his friends) to willingly choose the evil side for "good" reasons.
** Spoofed in Season 6 when Spike encourages Buffy to walk with him on the Dark Side -- which consists of Spike playing poker for kittens while Buffy gets drunk and makes snarky comments. Things become more serious later on in the season when Spike wrongly assumes (or convinces himself) that Buffy's depression and desire for rough sex means she wants to abandon her life and join him on the Dark Side. His failure to understand the complexity of her emotions has [[AttemptedRape serious consequences for both of them]].
* Sam spends about three seasons of ''Series/{{Supernatural}}'' trying to avoid turning to the Dark Side, even making Dean promise to kill him [[NotHimself if he ever goes evil]]. The fourth season, however, finds him drinking [[PsychoSerum demon blood]] to fuel his demon-provided powers so he can kill Lilith and prevent the Apocalypse [[DespairEventHorizon after she kills Dean]]. By the end of the season, thinking he's TheOnlyOne who can do it, Sam leaves his brother to go get even more power and kills Lilith, [[spoiler:[[NiceJobBreakingItHero inadvertently releasing Lucifer]] and starting the Apocalypse.]]
* The darker aspect of Delvian mental powers in ''Series/{{Farscape}}'', especially in the episodes "That Old Black Magic" and "Rhapsody In Blue". All in all, Delvian priests have a worrying tendency to turn to the Dark Side, for as they train for purity and gain more control over their abilities, they become more vulnerable to darker impulses; if they succumb to these, they will very quickly go insane.
* The Shadows in ''Series/BabylonFive'' start their work by tempting and corrupting powerful people.
* The Secret Society in ''Series/HouseOfAnubis'' soon bring in the newest teacher into their ranks (leading to his [[FaceHeelTurn face heel turn]].
** Season 3 has, what the heroes call, Team Evil. They eventually also start corrupting people into their team, [[spoiler:by locking them into a sarcophagus and stealing their soul for the god Ammit to devour.]] They are even worse when you discover [[spoiler:they took the soul of one of the Sibuna Members themselves.]] While this could be considered mind control, the members who had their soul lost openly admit that power feels good and are all glad that they lost their conscience, while the rest of them feel that way anyways.
[[/folder]]

[[folder: Professional Wrestling]]
* One of Wrestling/TheUndertaker's {{Red Baron}}s is "The Man from the Dark Side."
* Wrestling/TheMidnightExpress were [[PartsUnknown billed from there]].
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/NewWorldOfDarkness'' is filled with powers that slowly corrupt and tear into those who call upon them. In many cases, simply being supernatural leads one into temptation -- the average [[KarmaMeter Humanity]] of an elder vampire is around four, which is about the point at which even murder doesn't look like that much of a big deal anymore.
** Sometimes it is more explicit, however: ''TabletopGame/MageTheAwakening'' has [[EldritchAbomination Abyssal powers]] offering gifts to mages who serve them, while ''TabletopGame/PrometheanTheCreated'' has the eroding force of Flux and the Refinement of Flux, Centimani.
** The [[BeastMan Gangrel]] clan from ''TabletopGame/VampireTheRequiem'' get their own special variant. Any vampire can "ride the wave" and give into [[EnemyWithin their Beast]], but Gangrel can enter "the Red Surrender," a state where the Beast takes over and they become ''much'' more powerful. The downside? [[EvilFeelsGood It's addictive]].
*** You can break the addiction though through sheer willpower, and end up becoming a GeniusBruiser you become more connected to your humanity by telling the Beast where to stick it, and get bonuses to mental stats (Called the Red Denial) the downside? It feels about has pleasant as hearing nails on a chalkboard, and chewing tinfoil at the same time. Denying the beast feels AWFUL.
* The ''TabletopGame/OldWorldOfDarkness'', of which the above is the SpiritualSuccessor, is full of Dark Forces that corrupt their users.
** ''TabletopGame/WerewolfTheApocalypse'' has the Wyrm, the spiritual embodiment of entropy, death, and necessary destruction. Or rather, that's what it ''used'' to be, before it went batshit insane and became an OmnicidalManiac. Nowadays it's a force of subtle corruption and despair, an army of not-at-all-subtle mutants and sadistic monsters, and a spiritual energy fed and strengthened by every atrocity and act of abuse in the world. Its spirits animate countless tainted objects and places all over the Earth. Every emotion of hate, and every act of destruction and abuse a person commits, slightly erodes their soul and makes them more open to the Urge Wyrms, who push them further towards their master. Werewolves who ally with the Wyrm (willingly or not) become sadistic, insane, mutated, fucked-up Black Spiral Dancers.
** ''TabletopGame/MageTheAscension'' has the various evil forces served by the Nephandi, some of which appear to come from the Wyrm and others of which seem to be {{Eldritch Abomination}}s from the far edges of the Solar System. Serving them is not healthy for your sanity.
** The Elohim in ''TabletopGame/DemonTheFallen'' have the Torment: the mark of their estrangement from {{God}} and/or Grace. Due to the nature of the setting, it's much easier to gain Torment than to absolve oneself from it. And the more Torment you have, the more likely you are (it's in the gameplay mechanics!) to screw up some benevolent deed and turn it into a crime, earning more Torment in turn...
* Somewhat predictably for the setting, ''TabletopGame/{{Warhammer 40000}}'' takes this trope and hurls it screaming over the edge in the form of Chaos. The result? There's no Light Side--only a sort of Gray Side, and the actual Dark Side is ''sentient''. A sentient, extremely intelligent, masterfully manipulative, and very powerful Dark Side that occasionally takes matters into its own hands when mortal pawns aren't getting the job done. However, the greatest defense everybody has against Chaos is itself, since it or its [[GodOfEvil major manifestations]] will always turn on itself(/each other).
** Happens quite a bit to radical Inquisitors, who feel that using demonic powers or weapons to fight Chaos is a good idea, and don't quite understand that those are in fact good ways to get corrupted ''by'' Chaos. Especially because many Radicals have to employ evil methods to ''acquire'' such means.
** An excellent example of the power of Chaos, is the HorusHeresy novel {{Fulgrim}}. Fulgrim starts out as a Primarch, the settings' equivalent of a human archangel, and a great lover of art of all kinds. In the end, the least of his depravities is creating art with the blood and screams of his victims. Throughout Fulgrim's descent into madness, he never fully realized what was happening, and every step on the way makes absolute, reasonable, bone-chilling ''sense''.
* Tends to happen when you start using spells with the "Evil" descriptor in ''TabletopGame/DungeonsAndDragons''. Note: the descriptor is there for a ''reason''.
** The "Evil" descriptor is a bit misleading at times; Spells such as "Phantasmal Killer", which is MindRape in everything but name, does not have the descriptor, while spells such as "Deathwatch" which gives you a little timer to tell when the person you cast it on dies, does.
** In ''Dungeons & Dragons'' evil isn't just a word but a literal component of existence, which means that evil spells use physical capital-E Evil as an ingredient. Casting Phantasmal Killer against a group of children would still be evil, but since it doesn't actually ''invoke'' Evil as a spell component, the spell itself is as morally neutral as a Fireball or Lightning Bolt.
* Like many [[OurAngelsAreDifferent depictions of Angels]], should ''TabletopGame/InNomine'' Angels go against their nature too much, they [[FaceHeelTurn Fall]] and that Fall changes their very essence into Demons. It is up to the players how easy this is.
* It is in the very nature of ''{{Ravenloft}}'', the Demiplane of Dread, to addict and reward whoever acts evil.
** Though it also acts as [[BlessedWithSuck their prison.]]
*** In fact, Ravenloft ''doesn't'' reward evil, it actually punishes it horrifically, by dangling the evil person's greatest desire just out of reach. ''For all eternity.''
* Ebon Dragon Infernal Charms, in ''{{Exalted}}''. There are a lot of other morally dubious Charms, spells, and supernatural abilities, but only the Ebon Dragon's Charm trees will steadily impair your ability to act in an honest, moral fashion as you progress along them. (Granted, Infernals are one of the "villainous" factions to begin with, but they're entirely possible to play heroically, and Eclipse Solars and Moonshadow Abyssals can learn their Charms...)
* ''BlueRose'': Sorcery -- meaning most forms of ritual magic, as well as ordinary [[FunctionalMagic Inherent Gift]] magic if used in certain unethical ways -- works almost exactly like the classic Star Wars Dark Side.
* Picking up the theme from its literary counterpart above, in the ''[[TabletopGame/TheDresdenFiles Dresden Files]]'' RPG breaking any of the Laws of Magic invites attention from the Wardens and pushes player characters closer to {{NPC}} status...but each "Lawbreaker" power (one per Law and automatically acquired upon breaking it) then also provides a bonus towards actions breaking the same Law of Magic ''again''.
[[/folder]]

[[folder:Toys]]
* Draining one's [[AnatomyOfTheSoul moral light]] results in this in ''{{Bionicle}}.''
[[/folder]]

[[folder:Videogames]]
* The powerfully corrupting effects of the Dark Side of the Force feature in ''Star Wars'' video games.
** For instance, in the game ''VideoGame/KnightsOfTheOldRepublic'', you are eventually confronted by a fallen Jedi, [[spoiler: Bastila]], who attempts to lure you to the Dark Side and applauds atrocious actions... despite the fact that they were a dedicated Jedi Knight only a short time ago -- no more than four to six hours of gameplay time.
*** Although it's mentioned that [[spoiler: Bastila]] was brutally tortured by Malak for over a ''month'' before he managed to break her and convince her to embrace the Dark-Side, so it's somewhat justifiable.
** In the alternate ending of ''VideoGame/TheForceUnleashed'', you can choose to [[spoiler:kill Darth Vader and take his place as the Emperor's right-hand man. However, you then decide to kill the Emperor to elevate yourself further, but he sees it coming and mangles you to the point that you had to be put into a suit like Vader was, and are forced to serve as his apprentice indefinitely (Palps is also noticeably much more blunt about his opinion of you than he was about Vader).]]
** In ''VideoGame/JediAcademy'', the reason given to why your character is tempted by the Dark Side is his/her mounting anger towards a [[TheRival sort-of-friend who has been annoying and trying to beat him/her all along]], culminating with trying to kill him/her during his own momentary fall to the Dark Side. If you take the Dark Side option and have Jaden kill him, then instead of maybe going MyGodWhatHaveIDone or something else sensible after his/her anger fading, (s)he will go on to decide (s)he now wants power above all else and go after the villain not to stop her but to steal her ArtifactOfDoom. Apparently for a Jedi to become angry enough to kill a helpless prisoner automatically also makes them obsessed with power and others' weakness.
* From ''WarCraft III''
** The character Arthas follows this trope to the letter. Originally a paladin, he obsesses more and more over defeating the Undead Scourge that has been appearing throughout the land. When he finally traces it to its source, he decides to go after a InfinityPlusOneSword, Frostmourne, to defeat the undead menace. When he gets the sword, it murders his friend, steals his soul and whispers in his head, driving him mad and leading him to the Dark Side, eventually causing him to slay not only his family, his mentors, but overrun the land of his birth completely, which was what he was trying to prevent.
*** Oh, yes, and to ''become the master of the Scourge himself''.
** Then there is the Nightelf Illidan Stormrage, who had a similar path except for more personal reasons coupled with the effects this had on his body causing his peers to mistrust him. Ten thousand years in prison didn't help things, as he immediately (though manipulated by Arthas) went to claim a demon artifact that turned him into a half demon. He eventually allied ''with'' the demons in an attempt to stop the Lich King, and went completely insane when he was heavily injured while trying to do so.
*** Might be averted due to Thrall and the Dragon Aspects sending adventurers to the past in ''VideoGame/WorldOfWarcraft'' to retrieve what could seemly be the artifact itself, the Dragon Soul, to use to kill Deathwing in the 5-man dungeon "Well of Eternity". Although one of the Aspects said that the Dragon Soul was sent back to its rightful place in time after Deathwing's defeat, there were hints given by Blizzard to indicate that removing the artifact from that point at all could have severe consequences.
** Warlocks and Deathknights in ''World of Warcraft'', using evil powers to fight evil, are basically under constant threat of this happening, and there are many boss characters that ''have''. Players are immune to this.
*** Of course, there are the Old Gods that don't exactly fight battles on their own, but rather drive others mad, such as Deathwing.
** Finally, managing effects similar to this trope has been a key element to a few fights, most notably the Bloodqueen in Icecrown Citadel turning players into vampires. Affected players are much more powerful, but eventually have to bite someone else or they'll be mind-controlled.
* In ''{{Spore}}'', you can choose to ally with the [[BigBad Grox]], which actually gives you the "Dancing with the Devil" achievement, with the description "Have we gone to the dark side now?"
* The ''Satsui No Hadou'' or "Killing Intent" from ''StreetFighter'', which both Ryu and Ken have to deal with and which Akuma has embraced.
* ''VideoGame/TheKingOfFighters'' universe has Orochi, a SealedEvilInACan, which granted its power to several characters, who have the ability to enter the [[SuperpoweredEvilSide "Riot of the Blood"]] state when they lose control. Iori Yagami is the prime example of this kind of character.
* In the last route of ''VisualNovel/FateStayNight'', Angra Mainyu's corruption of the Grail causes [[spoiler: Sakura]] to undergo this kind of [[SuperpoweredEvilSide transformation]] after she [[spoiler: suffers an AttemptedRape by her adopted brother]]. [[spoiler: Any of the Servants she [[FaceHeelTurn corrupts]] instead of killing outright, including Saber and Berserker]], undergo a shift to The Dark Side along with her.
* In ''VideoGame/KingdomHearts'', this is represented by the "power of Darkness", which eventually corrupts all of the main villains and TheRival Riku. Later games establish that DarkIsNotEvil (sort of), allowing Riku to retain his good guy status ''and'' his [[EvilIsCool cool]] Darkness powers.
** It was also stated that Riku really is a special case, Darkness always corrupts and recovering from it to the extent Riku did has only ever been done by him and him alone, [[spoiler: And even getting there ''still'' took him inheriting his powers from someone who was falling to the darkness when he was given the spark ''and'' losing his body to it, and the manifestation of his inner darkness still haunts him five games and three years later.]]
* While it can also be TheCorruption, the power of the moon functions this way in [[FinalFantasyCrystalChronicles Ring of Fates]]. As TheDragon puts it.
-->'"We are Lunite. Hatred is our lifeblood... Rancor shall pave the path to the crimson heavens!"'
* ''VideoGame/{{Worms}}'' has a rather odd take on the Darkside being defensive by burrowing into the terrain and gaurding yourself with girders, it's still fighting dirty as you can burrow down and unleash an Armageddon if you have one.
* In ''MegaManBattleNetwork'' 4 and 5, the [[MadeOfEvil Dark Chips]] will make its user addictive to it and, eventually, corrupt the Navi into the darkness. In gameplay terms, when you use them repeatedly, the chips will force themselves up to the first selections of chips whenever you initiate a battle; oh, and you'll permanently lose your max HP by 1 each time you do that.
* In the ''Franchise/DragonAge'' series, BloodMagic (whose specialty is [[EvilIsEasy easily-accessible power]] and MindControl) has a highly corruptive effect on mages' sanity, as does consorting with demons (but that is more because the demons purportedly strive to corrupt mages in order to [[DemonicPossession possess]] them). Even blood mages who manage to resist corruption, like Merrill in ''VideoGame/DragonAgeII'', tend to inadvertently cause more harm than good in the long run.
[[/folder]]

[[folder:Webcomics]]
* Gwynn from ''Webcomic/SluggyFreelance'' has this with the Book of E-Ville and (formerly) with the demon K'Z'K.
* Subverted with [[spoiler: Vaarsuvius]] in ''Webcomic/TheOrderOfTheStick'' and his/her soul splice with the spirits of three psychotic mages [[spoiler: in order to stop the black dragon threatening V's mate and children, but also out of {{pride}}.]] [[spoiler: Vaarsuvius]] was told the soul splice would have an effect on alignment, but after the MoralEventHorizon is crossed, [[spoiler:this is revealed to be a lie set up to give V an excuse to do something that the elf would have otherwise avoided.]]
* In ''Webcomic/ComingUpViolet'' high school popularity is treated a lot like this. This is made all too evident when [[spoiler:Abby]] tries to convince [[spoiler:Violet]] to usurp the AlphaBitch's power and ends up sounding very much like [[StarWars Chancellor Palpatine]].
* Played for laughs in ''Webcomic/ElGoonishShive'':
--> "So you're saying you ''can't'' make me an army of goo-based hall monitors?"
--> "Even if I could, I would not give into the dark side so easily."
* In ''{{Endstone}}'', Banestone corrupts [[http://endstone.net/comic/issue-1-page-22/ through this]].
* Charmander, after using [[GRatedDrug Rare Candies]], becomes a bully [[http://hiddendepths.smackjeeves.com/comics/1359291/005-charmeleon/ Charmeleon]] and almost aggressively attacks Jigglypuff in ''151 Hidden Depths''.
* Parodied and subverted in ''Webcomic/{{Homestuck}}''. After her mother dies and she [[GoMadFromTheRevelation learns something about the]] [[EldritchAbomination Horroraterrors]] Rose goes "grim dark". Although this changes her appearance and prevents her from speaking normally, her personality is seemingly unchanged...though she understandably wants to kill the RealityWarper who killed her mother.
* In ''Webcomic/{{Sinfest}}'' [[http://www.sinfest.net/archive_page.php?comicID=2075 Satan talks it up after a failure at temptation.]]
[[/folder]]

[[folder:Western Animation]]
* ''WesternAnimation/AvatarTheLastAirbender'':
** Firebenders have all been taught to fuel their bending with anger, enhancing their warlike tendencies and giving many of them anger management problems. [[spoiler: Late in the series Zuko learns to use [[ThePowerOfTheSun the sun]] instead, and Iroh may have been doing the same all series.]] Even Aang's [[DefectorFromDecadence first Firebending teacher]] viewed it as a wholly destructive power.
** Even Waterbending can have darker uses, as in being able to [[spoiler: Bloodbend any living creature, or rip out the water within them.]]
* An episode of ''WesternAnimation/TheFairlyOddparents'' had Dark Laser offer Timmy a suit of dark powers, hoping to get him addicted to evil and [[WeCanRuleTogether make him his apprentice]]. It almost works.
* Parodied in ''WesternAnimation/SpongebobSquarepants'' when Barnacleboy tells Mermaidman he's crossing over to the Dark Side. It's then shown that half of the Krusty Krab restaurant is in a veil of utter blackness, to the point where we can't see anything within.
-->'''Mr. Krabs:''' "Why should I pay to light the whole restaurant?"
* Raven in the first season ''WesternAnimation/TeenTitans'' episode "Nevermore". Her inner darkness took control of her, that's why she pulled Dr. Light under her cloak with all the [[CombatTentacles black tentacles]] and did [[MindRape something horrible]] underneath. All with [[GlowingEyesOfDoom glowing]] [[RedEyesTakeWarning red eyes]] and the nastiest smile she's ever had in the show. It's a deep [[EnemyWithin internal struggle]] though, and she's mortified when she snaps out of it. Though the glow comes back and she snarls with sharp teeth when asked what she'd done to him.
[[/folder]]

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[[AffablyEvil We would be honored]] [[NoMrBondIExpectYouToDine if you would join]] [[DarthWiki us.]]

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