[[quoteright:338:[[Webcomic/FlakyPastry http://static.tvtropes.org/pmwiki/pub/images/fpastry448edit_copy_2306.jpg]]]]
[[caption-width-right:338:The "useful but explosive" kind. And so is her magic!]]

Magic and powers with a "chaotic" theme. Often referred to as "chaos magic", "wild magic" (not to be confused with the WildMagic trope) or, more fancifully, "entropic magic" or variants on that name. Sometimes appears in settings with an OrderVersusChaos cosmology, but can pop up anywhere.

It can function in many different ways, but frequent traits include: high randomness and uncontrollability, probability manipulation, and inducing accelerated decay and destruction, depending on how the writers understand the concept of chaos and entropy.

"Entropy" in particular is one of these scientific concepts which appeals to writers due to its cool, sinister-sounding name and its association with decay. In real life, "entropy" is a physical concept, roughly defined as a measure of disorder and chaos of a given system[[note]] Strictly speaking, the log of the number of possible configurations of the system with the same overall internal energy, which can also be interpreted as an increase in ordering/regularity, just to illustrate how loose the popular interpretation is[[/note]]. Per the second law of thermodynamics, the entropy of an isolated system can only grow, never decrease; the only way to decrease the entropy is for some external force to do work on it[[note]]think about how a messy room will only get messier over time, and it takes someone deliberately cleaning up to restore it to a more ordered state[[/note]]. Since the universe itself (as far as we know) is an isolated system with no external forces that can affect it, this suggests that eventually it will succumb to [[ApocalypseHow/ClassX4 "heat death of the universe"]]: eventually all organized systems will break apart[[note]] Ironically, despite people usually conflating this idea with chaos, the heat death of the universe will result in the most ordered state the universe has ever seen: a sea of matter stretching evenly and uniformly across the entire universe in all directions until the end of time[[/note]]. Hence why chaos-based entities tend to have an OmnicidalManiac vibe to them.

Chaos Magic also exists [[AluminumChristmasTrees in real life]]. It is a Postmodern esoteric practice that eclectically borrow from older magical traditions in order to create new rituals. Notable Chaos Magicians who have incorporated it into their work include William S. Burroughs, Grant Morrison, Timothy Leary, and Die Antwoord. [[https://en.wikipedia.org/wiki/Chaos_magic The other Wiki has more]].

Might be related to {{Antimatter}}, PowerOfTheVoid, and CastingAShadow.


* Chaos Magic in the MarvelUniverse. It was deemed so dangerous that magic users suppressed any knowledge of its existence in order to weaken it. Dr.Strange, ''the Sorcerer Supreme'', said that such a thing didn't exist. Then [[ComicBook/ScarletWitch Wanda Maximoff's]] probability-based mutant power allowed her to make contact with the imprisoned Elder god turned demon Cthon...

* ''Fanfic/ChildOfTheStorm'' has [[ComicBook/ScarletWitch Wanda Maximoff]] who, unlike her canon counterpart, is very skilled at managing her chaos magic - though when it first manifested along with her mutation, it nearly drove her completely insane despite the best of efforts of [[{{ComicBook/Magneto}} her father]], [[Literature/HarryPotter Albus Dumbledore]], [[ComicBook/IronMan Howard Stark]] and [[ComicBook/XMen Charles Xavier]], to the point where [[Literature/TheDresdenFiles the White Council]] wanted to execute her simply because she was too dangerous. Cue Doctor Strange sweeping in, flipping the White Council the bird and taking her as his apprentice.
** Hermione, ironically, seems to have a predilection for this. [[spoiler: Since she's Wanda's daughter, this is hardly surprising.]]
* In ''FanFic/TheLastDraconequus,'' the protagonist is Discord, a god of Chaos.

* In the ''Literature/{{Chalion}}'' series, the demons bound by sorcerers are innate creatures of chaos. One way to keep a demon tame and easier to control is to 'shed' entropy, by causing little forms of decay, rust, or rot. (In one case, a sorceress caused milk to sour and wine or beer to go bad, at this one particular inn, in order to keep her demon occupied. Another powerful but poorly-trained sorceress used the entropic powers to aid in laying siege to a fortress, destroying stored food, potable water, and many of the weapons.) Inversely, using sorcerous magic to ''undo'' some form of destruction is '''extremely'' difficult, but possible. (A sorcerer mentioned having reconstructed a burnt letter, at great cost.)
* The initial impetus for the main plot of the sixth ''Literature/TheDresdenFiles'' book is when Harry is hired to deal with an entropy curse that kills its targets in strange and unusual ways. A previous victim is killed after being hit by a car... while water-skiing. Harry manages to intercept and redirect another use of it that causes a frozen turkey to fall out of a passing aircraft and pulverise an attacking [[OurVampiresAreDifferent Black Court vampire]] and just for extra value, cause the cooking timer to pop out and ding.
-->"For my next trick, [[AnvilOnHead Anvils!]]"
* Isyllt, the heroine of Amanda Downum's ''Literature/TheNecromancerChronicles'' series, is a necromancer and an entropomancer, the latter being a somewhat related but much rarer ability. She can accelerate, focus and control decay; for example, she causes a steel lock to rust away to dust in less than a minute.
* In ''Literature/TheSagaOfRecluce'' pure Chaos is basically pure energy, but it has entropic side effects. Chaos mages age faster than normal humans, the wine they drink turns to vinegar before they're finished with it (or even after a minute or two for very powerful mages), books they read fall apart after a few years, and the city where the chaos mage guild is located is covered in a thin layer of fine white dust formed from Chaos energy slowly destroying the stones of the city.
* In a variation, [[NamesToRunAwayFromReallyFast Aornis Hades]] in the ''Literature/ThursdayNext'' series manipulates entropy to affect chance. Specifically, by lowering entropy in order to cause improbable and fatal accidents. This has the side-effect of causing numerous, unrelated coincidences to pile up just prior to the accident--long enough for Thursday to realize the attack is coming.
* The [[BigBad Lone Power]] in the ''Literature/YoungWizards'' series has the main goal of bringing death to the multiverse by spreading entropy everywhere (he's also responsible for the creation of entropy, by the way), and his powers are wizardly in nature. Conversely, the proper application of wizardry can slow entropic decay.
* In ''Franchise/{{Mistborn}}'', this is [[GodOfEvil Ruin's]] whole schtick, He is a living force of intelligent decay and entropy, seeking only to unmake the world. Appropriately enough, the magic system he empowers - hemalurgy - requires [[BloodMagic blood sacrifice]] to work, making it a power that can only be accessed through destruction.
* In ''Literature/ShadowOps'', entropy is the domain of [[BlackMagic Negramancy]]. Anyone with this power is a OneManArmy; the only known person with this power is able to destroy most of a fully-staffed military base of soldiers specially trained to fight magic-users in moments by simply making their equipment and bodies decay in seconds.
* The "wild magic" which is the AppliedPhlebotinum of ''Literature/TheChroniclesOfThomasCovenant'' books.
* Demons of the first choir in ''Literature/{{Pact}}'' are described as "entropy distilled" and "the antithesis to creation," and specialize in removing things from creation and leaving nothing in their place. There's no way to restore what was lost, and in many cases [[RetGone no way of knowing what was lost at all]]. It's speculated that the entire universe is itself composed of fragments of things they've devoured.
* Free Magic from ''Literature/TheOldKingdom'', which is made up of all the powers left over from when [[TheForce the Charter]] was made, most of which are inimical to ordinary life. Notably, unlike the heavily rule-bound Charter magic, Free Magic has almost no rules at all - so long as you have sufficient strength of will and a strong enough source of it, you can do just about anything (though it's best at tearing things down). Of course, there are [[WithGreatPowerComesGreatInsanity side effects...]]

[[folder: Live Action TV ]]
* ''Series/BuffyTheVampireSlayer'' had Ethan Rayne, who worshiped chaos and often used chaos magic.

[[folder: Tabletop Games ]]
* ''TabletopGame/DungeonsAndDragons''
** Cleric spells from the "Chaos" domain. Most are generic {{Status Buff}}s which just happen to function against law-aligned creatures, but they also include Shatter (damages crystalline objects), Chaos Hammer (an offensive spell which takes the form of "a multicolored explosion of leaping, ricocheting energy") and [[AnimateInanimateObject Animate Objects]].
** There was at least one prestige class in [[TabletopGame/DungeonsAndDragons 3.5 DnD]] called the "entropmancer" who used a "[[ArtisticLicensePhysics shard of entropy]]" as its main weapon. They kinda screwed up the whole physics thing there (a "shard of entropy" makes about as much sense as "a piece of temperature"), but the thematic link is obvious.
** The 2nd Edition supplement Tome of Magic had Wild mages and the Chaos sphere for priests. Both emphasized chaotic spells with random results. Wild Mages later returned as a sorcerer option in 5th edition.
** After the Time of Troubles the ForgottenRealms developed Wild Magic Zones, where any magic use could cause a random Wild Magic Surge which was often quite dangerous.
** The Wand of Wonder (several varieties), which had a different effect each time it was used.
** In 4th Edition, Sorcerers can choose Wild Magic as a spell source, which is described as channeling power from the Elemental Chaos. To go along with the theme, many Wild Magic powers daze or stun enemies or have an effect determined randomly via die roll. Even boons from various Wild Magic features are determined randomly.
* The Euthanatos in ''TabletopGame/MageTheAscension'' are masters of the Sphere of Entropy. In broad strokes this means they can tell when things are going to break down and they can make things break down.
** In ''TabletopGame/MageTheAwakening'' entropy gets divided into two Arcana. Fate allows manipulation of probability while Death includes decay (starting with objects at the basic level, living and undead beings at a moderate level of skill, and destroying spells and stored Mana at master level).
* Red magic in ''TabletopGame/MagicTheGathering'' is the most geared toward "chaos," with more cards with random or semi-random effects (mostly governed by coin flips) than any other color. Black has the most cards with "entropy" themes, although Green also gets into the mix with cards themed around natural decay.
* Entropomancers in ''TabletopGame/UnknownArmies'' have power over luck and accidents, and gain power by deliberarely putting themselves in risky situations. They're earned their nickname of "[[TooDumbToLive Bodybags]]" honestly.
* Anarchy Mages in ''[[TabletopGame/{{PoniesAndParasprites}} Ponies and Parasprites]]''. These characters have sought out and learned from Discord himself. They use a ''Pandemonium Spark'' to channel the powers of the God of Chaos in much the same way a Cleric from ''TabletopGame/DungeonsandDragons'' would. These mages have a tenuous grasp of their powers, meaning that their channels can and will go wildly out of control. [[note]]''"But that's all part of the FUN!" - Discord''[[/note]]
* ''TabletopGame/{{Warhammer}}'' and ''[[TabletopGame/{{Warhammer40000}} Warhammer 40,000]]''. The forces of Chaos represent ultimate entropy for both game universes, since the victory of the Chaos Gods is inevitable and naturally puts an end to everyone else. Chaos also happens to be the source of all magic in both 'verses.
** Some of the spells in the game have specifically entropic effects of the "aging to dust" sort.
** All forms of magic traditionally come with a random bad result from screwing up a spell/psychic power, ranging from a bad headache to exploding your own head and the heads of everyone around you to mutating into the local equivalent of a Shoggoth.

[[folder: Video Games ]]
* ''VideoGame/{{Warcraft}}'': Several names of demons are based on the word Entropy. Demons in ''VideoGame/WarcraftIII'' use chaos magic, and also have a number of "chaos" spells.
** Chaos Knight from [[VideoGame/DefenseOfTheAncients DotA]] uses this.
* ''VideoGame/FallFromHeaven''
** The entropy magic sphere is associated with Agares, the leader of the Evil gods, and its spells relate to decay and corrosion. Entropy magic nodes act as a source of [[PhysicalHell Hell Terrain]], and any mage who uses the magic [[EvilIsNotAToy will come back to life as a slave]] of the LegionsOfHell upon death, regardless of their nation's alignment.
** The chaos magic sphere is a flavor 1 chaos type, and is associated with the god of war (in a [[AnarchyIsChaos anarchistic,]] [[TheSocialDarwinist everyone fights everyone,]] sense.), who is a fallen, evil god as well.
* ''VideoGame/LordsOfMagic'''s chaos faith uses flavor 1 spells.
* ''VideoGame/HeroesOfMightAndMagic IV'' has a spell school literally ''called'' Chaos Magic, and consists mostly of direct damage spells. ''Heroes of Might and Magic V'' has an entire school devoted to destructive spells, as well.
* ''VideoGame/DungeonCrawl'' has Annihilations. ExactlyWhatItSaysOnTheTin.
* ''[[VideoGame/AncientDomainsOfMystery ADOM]]'' features a variety of magicians devoted to Chaos, including the [[NamesToRunAwayFromReallyFast Chaos Archmage]], guardian of the elemental Mana Temple. His powers are no more random than those of any spellcasting enemy, but he's ''much'' meaner than most of them. Like most of the other Chaos-themed creatures in the game, he can also [[TheCorruption corrupt]] your character with a melee touch attack, which produces a series of randomized [[BodyHorror warping effects.]]
* Entropy magic in the ''Franchise/DragonAge'' series consists mostly of {{curse}}s and other sinister powers and is closely connected to [[AnotherDimension The Fade]].
* The BonusBoss and TrueFinalBoss of ''VideoGame/TheReconstruction'' have "Chaos" as their element, as opposed to a certain optional character with "Order" as his element. Both end up effectively NonElemental.
* Entropy is an element in, well, ''VideoGame/{{Elements}}''.
* In ''VideoGame/DungeonSiegeIII'', this is used by Reinhart though the spells are more like FormulaicMagic that focus on DPS.
* ''VideoGame/TheSecretWorld'' has Chaos Magic, which incorporates both increases in entropy and manipulation of probability. Oddly enough, it's mainly used by the [[ChaoticNeutral Dragon]], who oppose any form of stagnation - as in, exactly what entropy causes. [[note]] Science note: Entropy, in a nutshell, is the tendency of things to revert to more stable and unchanging states.[[/note]]

* "Entropic Acid" is used to destroy a NighInvulnerable parasite in ''Webcomic/TheDragonDoctors.'' There's also been mention of an "Entropic Zone," a dimension where life forms age and objects decay at an accelerated rate.
* Zintiel from ''Webcomic/FlakyPastry'' whose [[PersonalityPowers personality is as chaotic as her magic.]]