Arrr, Champion backstory

Zac

th' Secret Weapon

Arrr, Read the backstory Arrr, Abilities and gameplay guide

3Arrr, Story chapters

1Arrr, Story connections

2Arrr, Named place connections

Arrr, The person behind the champion

Arrr, A story to start with

Arrr, Zac is the product of a toxic spill that ran through a chemtech seam and pooled in an isolated cavern deep in Zaun's Sump. Despite such humble origins, Zac has grown from primordial ooze into a thinking being who dwells in the city's pipes, occasionally emerging to help those who cannot help themselves or to rebuild the broken infrastructure of Zaun.

Arrr, Short biography by Riot Games · Data Dragon 16.20.1

Arrr, What shapes their story?

Arrr, The people who cared for Zac give an unlikely life a moral education as well as a home. His protection of Zaun grows from that relationship, making a product of dangerous waste capable of answering the city's hazards with compassion.

Arrr, Reading note by VRC.LOL

Arrr, Read Riot's full biography ↗

Arrr, Follow the story

Arrr, Story timeline

Arrr, Follow the main developments in order, then explore their consequences. Use each chapter's links to explore the people, regions and places involved. Artwork shows the character or wider world, not an exact reconstruction of each event; calendar dates are not assigned here.

Arrr, Riot Games · Regional world artwork
Arrr, Awareness gathers beneath the Sump
Arrr, Zac began as an unexpected result of Zaun's chemical waste, gathering in a cavern beneath the Sump. Something that might have been only another industrial hazard developed awareness and a capacity to care.
Zaun
Arrr, Riot Games · Regional world artwork
Arrr, An unusual body chooses a protective purpose
Arrr, Choosing to help gives that unusual origin a different meaning. Moving through pipes and repairing damaged infrastructure lets him protect people in spaces more celebrated champions might never see.
Zaun
Arrr, Riot Games · World artwork
Arrr, The city's discarded matter chooses to help
Arrr, Care from the people who recognised Zac's awareness gives his unusual origin a different future. His later protection of Zaun continues that kindness through an adaptable body. The Sump's danger explains where he came from, but does not decide what a being made there must become.
Sump Zaun

Arrr, Story guide by VRC.LOL, based on the linked Riot stories. Older biographies and newer stories can differ; no exact date or current whereabouts is implied unless stated.

Arrr, Picture the setting

Arrr, A world behind the story

Arrr, Official Riot setting artwork, not illustrations of these exact events. Open an image to see the complete composition.

**Arrr, Lights and Shadows**Arrr, Riot Games · World artwork

**Arrr, Public Hexdraulic Descender**Arrr, Riot Games · World artwork

Arrr, Explore the wider region

Arrr, People who shape the story

Arrr, Relationships and allegiances

Arrr, Discover the companions, communities and powers that matter to this champion. Each card explains the connection, rather than treating every nearby character as a friend.

Arrr, Not everyone important to this story is a playable champion. The reading suggestions below are labelled separately from these story connections.

Arrr, Follow the story

Arrr, Known places and connections

Arrr, Origins, journeys and documented events. A connection here does not mean this champion lives there now.

Arrr, Regional connection

Zaun

Arrr, Explore the regional timeline

Arrr, More about the region

Arrr, A city of industry and invention beneath Piltover, where hazardous experimentation and pollution coexist with resilient communities. Its stories ask who benefits from progress and who pays for it.

Arrr, Industrial cityscape

Zaun undercity

Arrr, Connected levels of workshops, industry and densely inhabited streets form Piltover's counterpart. Champion stories show different lives here, from community protection to dangerous chemical experiments.

Arrr, Explore this place

Arrr, Lower city

Sump

Arrr, Zaun's deepest inhabited level is associated with its harshest industrial conditions. Riot's gallery contrasts life here with the markets and institutions higher in the city.

Arrr, Explore this place

Arrr, Another perspective

Arrr, Stories to read next

Arrr, Continue with related characters, regional stories and other perspectives on the same themes.

Blitzcrank

th' Great Steam Golem

Arrr, Read backstory

Zeri

Th' Spark o' Zaun

Arrr, Read backstory

Arrr, The character, in detail

Arrr, Champion artwork

**Zac**Arrr, Classic champion artwork · Riot Games
Arrr, View full artwork

Arrr, Explore the wider settingArrr, Zaun

Arrr, The story beneath the scenery

Arrr, What makes this place matter?

Arrr, Zaun is a lived-in home as well as an industrial undercity. Its different levels separate workshops, markets and dangerous depths. Ekko and Zeri's community ties offer a different view from the chem-barons and experiments that dominate many outsiders' impressions.

Arrr, Look closer

Arrr, A window into this world

Arrr, Official Riot artwork. The gallery includes the regional setting; not every image depicts this exact landmark. Open an image to see the full composition.

**Arrr, Sump Level**Arrr, Riot Games · Runeterra world map

**Arrr, Promenade Level**Arrr, Riot Games · Runeterra world map

**Arrr, Life Survives in the Depth**Arrr, Riot Games · Runeterra world map

Arrr, Sources and story contextArrr, Official stories, artwork credits and reading notes

Arrr, Where the stories come from

Arrr, VRC.LOL writes the introductions, reading notes and connections using linked Riot Universe biographies and regional guides. Short champion summaries use Data Dragon version 16.20.1. Longer histories link to the official story used; some champions currently have a shorter official overview.

Arrr, What the pictures show

Arrr, Artwork belongs to Riot Games. Scenery comes from Riot's Runeterra world map; champion art depicts the character. A regional illustration sets the scene when a landmark has no dedicated image. It does not show a confirmed event at that exact place.

Arrr, A world still being written

Arrr, Older biographies and newer adaptations can differ. These guides introduce connections rather than declaring a final chronology or a character's current whereabouts. Translations help you explore and may keep original proper names. Follow the official sources for full context.