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How did Zaun and Piltover come to be divided, and who benefits?Fiction

In-universe lore. Claims are judged against the fiction's own canon, not the real world.

Arcane opens on a policed border between a gleaming city above and the undercity beneath it, but never sits down to explain how the two came apart. The game lore that preceded the series does explain it, at length, and the two accounts do not match.

8 established, 2 disputed, 2 debunked, 2 unresolved. We do not pick an answer; the evidence places each claim. How we decide

38 citations from 4 independent sources - 34 echo the same voices and count once. Graded B1-D1.

Added 5 Aug 2026 - canon current as of 5 Aug 2026

What the four states mean
  • Establishedsupported, uncontested
  • Disputedcredible sources disagree
  • Debunkedrefuted by the evidence
  • Unresolvedno settled answer

Established 8supported, uncontested

  • The official region material has the two once united and now separate yet symbiotic, with the undercity lying in the deep canyons and valleys threading Piltover, and Piltover itself situated on the cliffs above the district of Zaun.▰▰▱▱▱ likely3 points
    Supports
  • One account has the city cutting a canal through the isthmus on which its people lived, an excavation that made great portions of Zaun unstable until entire districts on the River Pilt collapsed below the western sea level, and thousands suddenly found themselves fighting for their lives.▰▰▱▱▱ likely2 points
    Supports
    • They dreamed of cutting a canal through the isthmus on which they lived, opening a path that would unite the seas surrounding Valoran and Shurima. The city poured great effort, wealth, and time into the construction.Janna champion biography, League of Legends Universe primary
    • However, the canal’s excavation made great portions of Zaun unstable. On one cataclysmic day, entire districts on the River Pilt collapsed below the western sea level, and thousands suddenly found themselves fighting for their lives against the clashing currents.Janna champion biography, League of Legends Universe primary
  • In the series the undercity is technically under the governance of Piltover's Council yet cast aside and isolated from the gains made above, perpetually riddled with crime and hardship, and silently controlled by chem-barons for want of real supervision.▰▰▱▱▱ likely3 points
    Supports
    • Though technically under the governance of Piltover’s Council, Zaun has virtually been cast aside and isolated from whatever gains and advancements had been made in Piltover. While Piltover prospers, Zaun is perpetually riddled with crime and hardship.Zaun, Arcane Wiki analysis
    • Due to the lack of true supervision over Zaun, the city is silently controlled by a group of chem-barons.Zaun, Arcane Wiki analysis
    • So heavily polluted, its air said to be denser than Piltover's, that those not native to Zaun find the need to wear gas masks when visiting, and Piltover residents deem the undercity as dangerous and look down on the denizens living there.Zaun, Arcane Wiki analysis
  • In the series the crossing works as a trade chokepoint: with merchandise frozen at the border and topsiders too afraid to cross, profits plummet, and the case is made that some trade beats none at all.▰▰▱▱▱ likely3 points
    Supports
  • The champion material states the wealth relation as labour: parents ageing beyond their years under dangerous conditions in suffocating factories for meager wages, while factory owners and Piltovan buyers profited immensely from that labour.▰▰▱▱▱ likely1 source
    Supports
    • Throughout his youth he watched his parents age beyond their years, toiling for too many hours under dangerous conditions in suffocating factories. They earned meager wages while greedy factory owners, and sneering Piltovan buyers, profited immensely from their labor.Ekko champion biography, League of Legends Universe primary
  • The series names the price of independence outright: free trade routes, blanket amnesty, unrestricted access to the Hexgates and sovereignty, offered in exchange for Jinx, with the phrase used being the Nation of Zaun.▰▰▱▱▱ likely3 points
    Supports
  • Shimmer is put as both a product of the undercity and an instrument of control: developed there through ruthless and unjust experiments, then handed out to followers to make them loyal upgraded thugs and used as a means of maintaining power and loyalty.▰▰▱▱▱ likely2 points
    Supports
    • Shimmer was developed by Singed, Zaun's infamous mad chemist, through a series of ruthless and unjust experiments.Shimmer, Arcane Wiki analysis
    • He uses the drug to complement his control of Zaun, hands it out to his followers, and makes them his loyal, upgraded thugs. The drug is a means of maintaining power and loyalty, yet it also represents the dark path that Silco is not afraid to take for his preferred future of Zaun's independence.Shimmer, Arcane Wiki analysis
  • The two bodies of material are stated to become one shared canon going forward, with the series' origin of Hextech taken as the origin in the unified canon, while champion lore written before that decision had not yet been adjusted.▰▰▱▱▱ likely2 points
    Supports

Disputed 2credible sources disagree

  • Whether the arrangement runs both ways is read two ways: official material calls the two separate yet symbiotic and has Piltover's wealth allowing Zaun to develop in tandem, while other readings put an extreme wealth disparity at the root of the conflict and the undercity's labour enriching those above.▰▰▰▱▱ unlikely2 against4 points
    Supports
    Against
  • Silco's project is described both as a separatist revolutionary's attempt to turn the undercity into a nation independent of Piltover's government and as a violent secessionist movement run through the production and distribution of Shimmer, with his hold on the undercity resting on that drug.▰▰▰▱▱ unlikely3 against4 points
    Supports
    • A separatist revolutionary, Silco sought to transform the undercity of Piltover into the nation of Zaun, independent from Piltover’s government.Silco, Arcane Wiki analysis
    Against

Debunked 2refuted by the evidence

  • The undercity read as nothing but a catch basin for the waste above, its residents living on scraps, runs against material that has it thriving, its people vibrant and its culture rich, with that culture built out of catastrophe.Refuted byThough it exists in perpetual smogged twilight, Zaun thrives, its people vibrant and its culture rich.refuted2 against4 points
    The claim rested on
    Refuted by
  • The account in which a sunken isthmus and the Sun Gates built over the water produced the divide belongs to the game material, and is described as not carrying into the series, where those gates do not exist and the undercity is said to have formed differently.Refuted byZaun as shown in the Arcane universe has a considerably different origin as well as city layout. The Sun Gates do not exist, therefor the way the undercity was formed is different in comparison to main canon. There are also no indications that Zaun was originally a Shuriman settlement, representing original Piltover before the construction of the Sun Gates and subsequent sinking of whats considered canon modern Zaun.refuted1 against3 points
    The claim rested on
    • The plan involved using thousand of chemtech bombs to crack open an area of the land so that a cavern could be created, but the results were catastrophic, as in what seemed to be an accident the bombs triggered a series of earthquakes that completely destroyed the isthmus and sank large districts of Zaun and thousands of its citizens, while also leaking poisonous gas into the city's surviving areas.Zaun, League of Legends Wiki analysis
    • Eventually Zaun was rebuilt. In order to regulate the oceanic passage they were built over, the Sun Gates were constructed, forcing all transport through the waters to be regulated by Zaun. This brought immense wealth to the city and likely led to Piltover's construction and elevation from Zaun, as the merchant clans were in control of most of the money coming through this trade route.Zaun, League of Legends Wiki analysis
    Refuted by
    • Zaun as shown in the Arcane universe has a considerably different origin as well as city layout. The Sun Gates do not exist, therefor the way the undercity was formed is different in comparison to main canon. There are also no indications that Zaun was originally a Shuriman settlement, representing original Piltover before the construction of the Sun Gates and subsequent sinking of whats considered canon modern Zaun.Zaun, League of Legends Wiki analysis

Unresolved 2no settled answer

  • What set Piltover apart and above is left as an inference in the game material, which puts the wealth from the Sun Gates only as the likely cause of that city's construction and elevation from Zaun.▰▰▱▱▱ likely1 source
    Supports
    • Eventually, Zaun was rebuilt. In order to regulate the river passage they were built over, the Sun Gates were constructed, forcing all transport through the waters to be regulated by Zaun. This brought immense wealth to the city and likely led to Piltover's construction and elevation from Zaun, as the ruling families were in control of the taxes and trade produced by the Sun Gates, leading to the formation of the actual Mercantile Clans of Piltover.Piltover, League of Legends Wiki analysis
  • How long the divide has stood is unsettled: the series has Piltover founded about 200 years ago, the older material dates the partial destruction and the gate construction that led to its rise to 772 AN, and the exact timing of Piltover's completion is said to remain unclear.▰▰▱▱▱ likely3 points
    Supports

Spotted an error, or have a source to add? (tell us which claim). Missing a topic? .

arcaneleague of legendszaunpiltoverworldbuilding

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