How to win lane as Cassiopeia against Zac · 64.62% win rate (65 Emerald+ games, lolalytics, sampled July 2026) · Matchup data reviewed on patch 26.15
Poison shreds HP stacking — free DPS lane where only his engage cooldown deserves respect.
Track: Zac's E — Elastic Slingshot (21–9s cooldown). Long-range engage — interrupt the charge or punish the cooldown.
Read from Cassiopeia's seat: which stage windows this plan plays for against Zac.
| Stage | Favoured | Why |
|---|---|---|
| Level 1 | Even / skill | You both have nothing at level 1 — one ability and no Q poison to feed Twin Fang yet — so deny his last-hits and don't trade into his autos for free. |
| Level 2 | Cassiopeia | Your second point lets you prime-Q the zone then E the poisoned cell for a real trade, and his slow walk-up can't punish Serpentine Grace's move speed. |
| Level 3 | Cassiopeia | Full Q-into-E poison plus move-speed kiting comes online and his blob has no dash left to escape your chained Twin Fang. |
| Levels 4-5 | Cassiopeia | Ranks in Q and E let you spam Twin Fang on an immobile tank — W (Miasma) grounds his E sling so he can never close the gap. |
| Level 6 | Cassiopeia | Petrifying Gaze turns his commit into your kill — it stuns only what faces you, so fire it as he lands facing in. |
| First item | Cassiopeia | Liandry's-style percent burn shreds his tank HP faster than his passive blob regen heals, and W keeps his only engage shut off. |
| Two+ items | Cassiopeia | You stay ahead in lane — his off-meta isolated tank kit trades evenly at best, and W permanently answers his dash-reliant all-in. |
Level 1 is the only even patch — you have one ability and no Q poison to feed Twin Fang yet, so do not let an early poke or his autos chunk you for free; last-hit and stay healthy. From level 2 you flip it: place Q so the zone poisons him, then Twin Fang the poisoned target, and Serpentine Grace lets you walk out of his slow approach. What loses you the lane is eating an Elastic Slingshot from fog before Miasma is online, so ward the side brush and keep W ready to ground the landing.
Pooled Emerald+ win rates from Cassiopeia's side, sampled July 2026.
The full Cassiopeia vs Zac report continues with the mid-game plan, the late-game and teamfight plan, every power spike to play around, and the win conditions for both sides — plus cooldown tracking and the live enemy-jungle tracker inside the app.
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Cassiopeia — a 64.62% win rate vs Zac in top lane over 65 games is a real advantage.
Not really — Cassiopeia holds a real statistical advantage (64.62% win rate), so Zac is the one working uphill.
Statistically yes — Cassiopeia counters Zac in top lane, winning 64.62% of 65 Emerald+ games.
Cassiopeia takes Conqueror on the Precision tree with Presence of Mind, Legend: Haste and Last Stand, and Sorcery secondary (Manaflow Band and Transcendence) vs Zac.
Start Doran's Ring + 2 Health Potions and back for Oblivion Orb (≈800g) — cuts his healing. Build Seraph's Embrace / Liandry's Torment first, then Rylai's Crystal Scepter, with No boots — bank the gold into MR via Rookern later.
Playing the other side? Zac vs Cassiopeia guide →
All Cassiopeia top lane matchups →
More Cassiopeia top lane matchups: vs Yone · vs Yorick · vs Zaahen · vs Ziggs · vs Aatrox · vs Akali