How to win lane as Kai'Sa against Karthus · 46.44% win rate (3,204 Emerald+ games, lolalytics, sampled July 2026) · Matchup data reviewed on patch 26.15
He pokes the approach your kit needs — dodge the rotation, stack the wave, and R the gap his cooldowns leave.
Track: Karthus's R — Requiem (200–160s cooldown). The global execute — recall above the red line and track it from his level 6 on.
Read from Kai'Sa's seat: which stage windows this plan plays for against Karthus.
| Stage | Favoured | Why |
|---|---|---|
| Level 1 | Karthus | Level 1 favors Karthus as Lay Waste out-ranges and pokes you off CS. |
| Level 2 | Karthus | Level 2 stays his with layered Q poke before your dash is available. |
| Level 3 | Kai'Sa | Level 3 is yours: you dash through the Q delay and burst the immobile Karthus. |
| Levels 4-5 | Karthus | Levels 4-5 swing to Karthus with Wall of Pain zoning and mana to spam Q. |
| Level 6 | Karthus | Level 6 is his: global Requiem punishes your poke and Death Defied keeps damaging. |
| First item | Karthus | First item favors his safe-range carpet-bomb poke you can't close on. |
| Two+ items | Kai'Sa | By 2+ items your mobility flanks past the Wall to delete him before his death-passive matters, flipping it. |
Level 1-2 favors Karthus: his Lay Waste out-ranges everything you have and pokes you off the wave before your dash is online. He out-ranges you with a spell that costs him almost nothing, so stop trying to answer it and farm instead. Your missiles clear the wave faster than he does, which pushes him into the mana problem he cannot solve. Take the plate on the crash and let the evolve timing rather than the trade decide the lane.
Pooled Emerald+ win rates from Kai'Sa's side, sampled July 2026.
The full Kai'Sa vs Karthus 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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Karthus, slightly — Kai'Sa wins 46.44% of 3,204 games; winnable with the right plan.
Mostly — Karthus has a small statistical edge (53.56% win rate), but execution decides this lane far more than the pick does.
No — if anything Karthus has the slight edge (Kai'Sa wins 46.44%), though it stays close.
Kai'Sa takes Hail of Blades on the Domination tree with Taste of Blood, Grisly Mementos and Treasure Hunter, and Precision secondary (Presence of Mind and Coup de Grace) vs Karthus.
Start Doran's Blade + Health Potion and back for Pickaxe / Recurve (≈1000g). Build Kraken / Statikk first, then Guinsoo's / Zhonya path, with Mercury's Treads / Berserker's.
Playing the other side? Karthus vs Kai'Sa guide →
All Kai'Sa bot lane matchups →
More Kai'Sa bot lane matchups: vs Jhin · vs Jinx · vs Kalista · vs Kog'Maw · vs Lucian · vs Miss Fortune