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League of Legends Wiki
Astute Academic LoR profileicon.png
"I've brought my books! Hope that's alright."

This article has recently been converted to the new character-focused layout but it needs a lore enthusiast to help fill-out the sections. In addition, 'Relations trivia' and 'Lore trivia' have been moved here but need restructuring into article content - lore is no longer trivia.

If you're eagar to help but would like to reference a completed character article: Aurelion Sol, Soraka, Jinx and Viego are excellent.

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Zac (Universe)Zac (Universe)
Zac (League of Legends)Zac (League of Legends)
Zac (Esports)Zac (Esports)
Zac (Teamfight Tactics)Zac (Teamfight Tactics)
Zac (Development)Zac (Development)
Zac (Trivia)Zac (Trivia)

Zac Zac is the product of a toxic spill that ran through a chemtech seam and pooled in an isolated cavern deep in Zaun Crest icon.png 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.

Zac OriginalSquare.png"The angrier you get, the more this is going to hurt... "  Zac
Read Biography



Early Life

Contemporary history

Recent events


Zac is an amorphous green blob of zaunite ooze which congeals largely in his hands, forearms, feet, torso, and head. He has a large underbite with his green jaw, yellow eyes, and tail of slime that extends from his head. He can inflate himself into a ball shape.






  • Zac was born from a chem spill in Zaun's Sump level, gaining basic sentience to respond to outside stimuli. He was sequestered in a laboratory by a group of alchymists funded by chem-baron Saito Takeda, to be molded into a supersoldier under his command. Two of the alchymists grew emotionally attached to Zac and, when they discovered who their benefactor was, spirited away with him deep within Zaun, lovingly raising him as their own son while being on the run from baron Takeda's thugs.
    • Zac responds to people's emotions and acts accordingly, his mood changing with the reigning sentiment at any given time, best exemplified when he went berserk after his parents were killed by Takeda's men. After burying them, he decided to set off and help the people of Zaun, fighting chem-thugs and fixing the city's infrastructure when the opportunity presents itself.

Read More


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The Secret Weapon

By Graham McNeill

Starring Champion

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Short Story • 6 Minute Read


By Graham McNeill

The golden hour between fifth and sixth bell. That's my favorite time of day. It's when most people in the Factorywood finish their work shifts. They're bone tired, but they're done for the day. Work is behind them. A hot meal and home are ahead. The people here are nice, and I always feel good squeezing my gelatinous body through the cliff-cracks seaming the rocks around the Factorywood. I feel love emanating from a man going home to his newborn son. I relish the anticipation of a married couple looking forward to a romantic dinner in the Boundary Markets.

Alternate Universes

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Road to the Cup

As the 2013 League of Legends World Championship final draws near, we showcase the biggest heroes in esports from around the world. Many teams fell by the wayside in epic battles, and now only two remain: Korea's SK Telecom T1 and China's Royal Club. Who will rise?

Outdated Lore

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Zaun Amorphous Combatant

By Unknown Author



Change log

Character blurb


See also