[[caption-width-right:300: Two adventurers trying to save their comrade from one of the {{Eldritch Abomination}}s left by the Precursors.]]

''Mutant: Undergångens Arvtagare'' is a Swedish {{tabletop RPG}}. The world ended over a millennium ago, and a new world has grown in the ruins.

Players have four classes to chose between: Human, Mutant, Psionic, and Robot. (While most games classify such options as races, in this game they are labeled classes.) Mutants and psionics can be either human or HalfHumanHybrid. The human versions can often pretend to be real humans, but risk getting exposed. The hybrids have a more stable social status.

Humans are the aristocracy of the local empires, the inheritors of those who rose from their underground bunkers so long ago and re-conquered the world. Their technology has withered away since, but they still cling on to their former glory. Human characters are given a lot of social advantages from the start; a poor outsider human still has a far greater chance to establish herself in society than a mutant.

Mutants have physical superpowers, but are more specialized than humans. They are also socially repressed.

Psionics have mental superpowers, but are persecuted.

Robots have special rules and powers, but also lots of disanvantages including dubious social standing.

The game world is centered on [[TheEmpire Pyrisamfundet]], taking up the middle of what used to be Sweden. Other important nations are [[PoliceState Ulvriket]], Gotland, and the city-state of [[TheRepublic Göborg]].

These countries control their cities somewhat well. The countryside is less lawful, and the "forbidden zones" are entirely outside government control. These zones are dangerous in various ways. One zone causes madness in those who enter, another is full of aggressively growing crystals, and so on.

See also ''TabletopGame/MutantChronicles''.

!!This tabletop-game provides examples of:

* AbsurdlySharpBlade: Some of the ancient artifacts.
* AfterTheEnd: The timeline starts a unknown number of centuries after the apocalypse.
* AmusingAlien: ancient robot characters often fill this role.
* AnimalWrongsGroup: An entire species are made as a parody of this trope. Rubbitar, a race of sentient rabbits, hate all flesheaters. Subverted/justified in later works, where it turns out that humans have a history of eating them in spite of knowing that they are sentient.
* ApocalypseHow: Type 2, in the backstory.
* AttackAnimal: Quite common.
* BlackAndGreyMorality: Some of the adventures feature really horrible villains, while the better factions are still morally dubious. Of course, the player characters can still be knights in shining armor if the gamemaster allows, but the game itself is really not designed that way.
* BlackComedy: Satire about enviormental collapses, pandemics, nuclear holocausts, social injustice, et cetera.
* ClapYourHandsIfYouBelieve: Psionics are often treated this way by naive characters.
* DoomsdayDevice: Several, and they all lack proper maintenance...
* EldritchAbomination: In the form of giant warmachines and other such ancient horrors.
* TheEmpire: Pyrisamfundet, where most of the game content is located.
** Samfund, incidentally, means something like [[PeoplesRepublicOfTyranny 'League' or 'Association']].
* EquippableAlly: Common.
* GreyAndGreyMorality: The normal mood of the game, with all sides being dubious and having lots of questionable baggage.
* HalfHumanHybrid: Pigs and Dogs are big ethnic groups in the empire, while rabbits are usually hostile. All and any animals are possible: One canon character is a humanoid frog.
* LostTechnology: A cornerstone of the setting.
* LivingWeapon: Fits the setting.
* NeglectfulPrecursors: They left A LOT of stuff behind. Some of it useful, some lethal, some poisonous, et cetera.
* NonsenseClassification: Pyrisamfundet doesn't like to have a forbidden zone in the middle of their nation. They feel it's embarrassing. So they decided that it isn't a real forbidden zone. Sure, it's an ash-desert full of monsters and mysterious phenomena - but hey, this area is geographically shaped like a square. ''Real'' forbidden zones are round!
* NoSuchThingAsSpaceJesus: While the psions can perform miracles and are revered as prophets among the mutant tribes, the humans know that it's "only psionics", nothing more.
* OutgrownSuchSillySuperstitions: Subverted - the humans pride themselves with their rationality and knowledge, but they have lost true science. Their knowledge is muddled, full of misunderstandings, superstitions and ancestor worship.
* PeoplesRepublicOfTyranny: The republic Gotland is probably a bit of this, but it's hard to say for sure since the country was never given a expansion of it's own.
* PlantPerson: Mutants (humans as well as furry humanoid animals) can have photosynthesis as one of their mutations. This make their skin/fur green and capable of feeding on sunlight.
* PoliceState: Ulvriket, one of Pyrisamfundets prime competitors.
* PunnyName: Lots of them.
* PsychicPowers: One of the main themes.
* TheRepublic: The City-State of Göborg fills this role.
* SpiritualLicensee: Post-apocalyptic, mutants, humanity's on the decline... [[ComicBook/AgeOfApocalypse sound]] [[ComicBook/OldManLogan familiar?]]
* SteamPunk: A bit of it. The civilization is on steam power level.
* StupidityInducingAttack: This exists as a psionic power known as "Parasit" (would be "Parasite" in English). The character increases one of his own attributes by stealing it from someone else, and Intelligence can be the chosen attribute.
* TheyChangedItNowItSucks: Defied -- Depending on how you count, there are four or five different games calling themselves "Mutant". The first was very close to ''Mutant UA'', while the second and [[TabletopGame/MutantChronicles third]] had nothing in common with it. ''Mutant UA'' went back to basics, returning to the original game-world while giving it some big updates (the fifth, ''Mutant: Year Zero'' was intended to take place in roughly the same world as ''UA'', but several centuries earlier as the various races are just beginning to emerge and construct a new civilization).
* WeAreStrugglingTogether: One of the reasons the humans have such power over the humanoid mutated animals is that the various animal groups typically hate each other. When they try to unite against their oppressors, dark hilarity often ensues.
* WrittenByTheWinners: Played straight, exaggerated, parodied and PlayedForLaughs.