How to win lane as Karthus against Samira · 52.53% win rate (1,146 Emerald+ games, lolalytics, sampled July 2026) · Matchup data reviewed on patch 26.15
Her whirl can't block the aura but her dive ends auras — wall the surf and die casting if she commits anyway.
Track: Samira's W — Blade Whirl (30–22s cooldown). Deletes every projectile for a second — hold your key shots until the whirl is spent.
Read from Karthus's seat: which stage windows this plan plays for against Samira.
This is Karthus's own plan; across 1,146 pooled games the lane is leaning Karthus.
| Stage | Favoured | Why |
|---|---|---|
| Level 1 | Karthus | Melee Samira must enter your Q and Defile range to build any style early. |
| Level 2 | Karthus | Level 2 W shreds her approach so your poke lands before she stacks. |
| Level 3 | Karthus | Level 3 Defile plus isolated Q punishes every step she takes to trade. |
| Levels 4-5 | Karthus | Levels 4-5 your zone keeps her off the wave and denies style stacks. |
| Level 6 | Samira | At 6 her R Inferno Trigger executes you point-blank while W blocks your burst. |
| First item | Karthus | First-item Defile scaling out-pokes her and pushes her out of ult range. |
| Two+ items | Karthus | In 2+ item fights your zone and global ult beat her once you can peel the dive. |
Levels 1-2 punish her melee range: she can't CS or build style without stepping into your ranged Q and Defile, so zone her off the wave and deny her stacks. She needs close range for her whole pattern, so Defile is genuinely worth its mana whenever she steps in. Cast Lay Waste at the ground she has to cross to reach the wave. Keep Wall of Pain for the dash rather than the approach, since a slowed Samira loses the style rating she came for.
Pooled Emerald+ win rates from Karthus's side, sampled July 2026.
The full Karthus vs Samira 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 — a 52.53% win rate edge over 1,146 games; execution can flip it.
Mostly — Karthus has a small statistical edge (52.53% win rate), but execution decides this lane far more than the pick does.
Not a hard counter — Karthus has a slight edge (52.53% win rate), and play quality decides the rest.
Karthus takes Dark Harvest on the Domination tree with Cheap Shot, Grisly Mementos and Ultimate Hunter, and Sorcery secondary (Manaflow Band and Transcendence) vs Samira.
Start Doran's Ring + 2 Health Potions and back for Lost Chapter (≈1300g). Build Liandry's / Blackfire first, then Rabadon's path, with Plated Steelcaps / Sorcerer's.
Playing the other side? Samira vs Karthus guide →
All Karthus bot lane matchups →
More Karthus bot lane matchups: vs Lucian · vs Miss Fortune · vs Nilah · vs Senna · vs Seraphine · vs Sivir