How to win lane as Irelia against Cassiopeia · 49.22% win rate (386 Emerald+ games, lolalytics, sampled July 2026) · Matchup data reviewed on patch 26.15
She kites you out — survive, then stun her on the Miasma gap and Q-reset through her wave.
Track: Cassiopeia's W — Miasma (24–16s cooldown). Grounds you — dashes and movement abilities are disabled inside it.
Read from Irelia's seat: which stage windows this plan plays for against Cassiopeia.
| Stage | Favoured | Why |
|---|---|---|
| Level 1 | Even / skill | Cassiopeia has no early burst and only Noxious Blast — but you have no E-stun yet either, so dodge her Q and farm with Bladesurge instead of trading; level 1-2 is a skill check, not her lane. |
| Level 2 | Cassiopeia | Her Miasma (W) grounding comes online and cancels your Q dash, so she controls the trade range while you still have no E to answer. |
| Level 3 | Cassiopeia | She out-pokes you with ramping poison and grounds any Bladesurge you throw — your level-3 E-combo is your one punish, but she edges the lane if her Miasma keeps your dash off. |
| Levels 4-5 | Even / skill | Her poison ticks constantly and Miasma keeps shutting off your reset chain, so she chips you down across levels 4-5 faster than your sustain recovers. |
| Level 6 | Cassiopeia | Petrifying Gaze (R) face-stuns you out of any frontal all-in and her poison finishes you — never commit facing her once she hits 6. |
| First item | Even / skill | Her Liandry's/Blackfire spike out-DPSes your Trinity bruiser spike at range while Miasma grounds your dashes and Serpentine Grace kites you — her first item beats yours in a straight lane fight. |
| Two+ items | Cassiopeia | At 2+ items her poison still out-ranges and out-DPSes you, and Miasma keeps grounding your gap-close — she scales harder, so unless you wall her with Vanguard's Edge in tight terrain she kites the duel and wins. |
Cassiopeia is weak at level 1 with only Noxious Blast (Q), so your job is to NOT feed her poison ramp — sidestep every Q and last-hit with the tip of Bladesurge so you take farm without eating stacks. At level 2 her Miasma (W) gives her the grounding that cancels your Q dash, so do not throw a Bladesurge she can ground mid-flight. Level 3 is your one real punish window: once E (Flawless Duet) is up, if she steps forward to Q a minion, E-stun her and Bladesurge-reset in before her Twin Fangs (E) and poison can answer.
Pooled Emerald+ win rates from Irelia's side, sampled July 2026.
The full Irelia vs Cassiopeia 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, slightly — Irelia wins 49.22% of 386 games; winnable with the right plan.
Mostly — Cassiopeia has a small statistical edge (50.78% win rate), but execution decides this lane far more than the pick does.
No — if anything Cassiopeia has the slight edge (Irelia wins 49.22%), though it stays close.
Irelia takes Conqueror on the Precision tree with Triumph, Legend: Alacrity and Last Stand, and Resolve secondary (Second Wind and Bone Plating) vs Cassiopeia.
Start Doran's Shield + Health Potion (vs her poke) and back for Core component + boots (≈1300g). Build Blade of the Ruined King (%HP duel spike) first, then Wit's End / Sterak's Gage, with Mercury's Treads.
Playing the other side? Cassiopeia vs Irelia guide →
All Irelia top lane matchups →
More Irelia top lane matchups: vs Ambessa · vs Aurora · vs Camille · vs Cho'Gath · vs Darius · vs Dr. Mundo
Also played in: Mid Lane