How to win lane as Mordekaiser against Cassiopeia · 40.68% win rate (118 Emerald+ games, lolalytics, sampled July 2026) · Matchup data reviewed on patch 26.15
She kites your slow kit — E-pull the step-up, then drag her into the Realm where she can't run.
Track: Cassiopeia's W — Miasma (24–16s cooldown). Grounds you — dashes and movement abilities are disabled inside it.
Read from Mordekaiser's seat: which stage windows this plan plays for against Cassiopeia.
| Stage | Favoured | Why |
|---|---|---|
| Level 1 | Even / skill | Level 1 is feeble for both — she has no poison ramp and you have one ability up — so contest farm and set up your 2-3 trade spike rather than forcing anything. |
| Level 2 | Mordekaiser | Q + W come online: your single-target Obliterate cone out-trades her unramped poison and Indestructible banks the chip, so short trades here are yours before Darkness Rise even fully stacks. |
| Level 3 | Cassiopeia | Her Q poison ramps every level — if you whiff an E-pull she just chips you out from range, and her agency to poke-and-back grows while your trade window shrinks. |
| Levels 4-5 | Cassiopeia | Through 4-5 the lane tilts to her: she only commits when her W ground is down on her terms, and her ranged DPS pulls even-to-ahead any time you can't land the pull onto your aura. |
| Level 6 | Mordekaiser | Realm of Death banishes her 1v1, cutting her from her team and stat-draining her — her sustained poison can't out-grind your max-HP Darkness Rise aura in a duel, your guaranteed kill window. |
| First item | Even / skill | First item is genuinely contested — your Liandry's Torment and Sorc boots make the E-into-Q all-in lethal if she's Flashless, but she's also coming online, so it swings on cooldowns and her W ground. |
| Two+ items | Cassiopeia | Full Rylai's + Liandry's Cassiopeia slow-poisons you into chip range, out-damages your shield, and kites your aura with passive move speed — she out-scales and you simply can't catch her. |
"Both of you have a feeble level 1 — Cassiopeia has no poison ramp yet and you've got one ability up — so just contest the wave; neither of you can punish hard. Your real window is 2-3: once Q and W are up, your single-target Obliterate smash plus a banked Indestructible shield out-trades her early chip, and Darkness Rise starts ticking if you stay glued. The thing to respect is her W (Miasma) — it won't cancel your E pull (you have no dash to cancel), but it grounds you so you can't Flash out and slows you in the poison cloud, so bait it or wait for it down before you commit."
Pooled Emerald+ win rates from Mordekaiser's side, sampled July 2026.
The full Mordekaiser 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 — Mordekaiser wins only 40.68% of 118 games, so Mordekaiser plays this as the disadvantaged side.
Not really — Cassiopeia holds a real statistical advantage (59.32% win rate), so Mordekaiser is the one working uphill.
No — Cassiopeia counters Mordekaiser (Mordekaiser wins only 40.68% of games). Play it as the disadvantaged side and lean on the windows in the plan.
Mordekaiser takes Conqueror on the Precision tree with Triumph, Legend: Haste and Last Stand, and Resolve secondary (Second Wind and Overgrowth) vs Cassiopeia.
Start Doran's Shield + Health Potion and back for Haunting Guise / Giant's Belt (≈900-1300g). Build Liandry's Torment (burn carries her extended trades) first, then Riftmaker (omnivamp turns the Realm 1v1 unloseable), with Mercury's Treads.
Playing the other side? Cassiopeia vs Mordekaiser guide →
All Mordekaiser top lane matchups →
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