Patch 26.9 Data
Champion Matchups
Pick two champions and see who wins. Win rates, counters, and tips powered by live ranked data.
Champion 1
Kai'Sa
VS
Champion 2
Karthus
vs

44.7%
Kai'Sa win rate vs Karthus
Karthus hard counters Kai'Sa
311
Games Analyzed
44.7%
Kai'Sa WR
55.3%
Karthus WR
-424
Avg Gold Diff @15
Kai'Sa
DamageMixed
StyleBurst
RangeRanged
Difficulty***--
StrongMid game
RunesLethal Tempo / Resolve
SummsFlash + Heal
Karthus
DamageAP
StyleSustained
RangeRanged
Difficulty**---
StrongLate game
RunesDark Harvest / Inspiration
SummsFlash + Smite
Power Spike Timeline
Kai'Sa
Level 6
Karthus
Level 6
Karthus
1 item
Kai'Sa
Q evolve
Kai'Sa
2 items
Karthus
3 items
How to Play This Matchup
Power Curve
Kai'Sa is strongest mid game while Karthus peaks late game. Play around your power window.
Mixed Resistances
Kai'Sa deals Mixed damage while Karthus deals AP. Build resistances accordingly  don't stack the wrong type.
Hit and Run
Kai'Sa needs to combo and back off. Don't stay in extended trades against Karthus's sustained damage. Short trades, then disengage.
Exploit Kai'Sa's Weakness
Kai'Sa's main weakness: Short range, weak early, needs evolves to function. Play around this to maximize your advantage.
Kai'Sa Win Condition
Evolve abilities, R into backline or R for safety, hybrid damage
Karthus Win Condition
R global damage, passive keeps dealing damage after death
Recommended Items
Kai'Sa
Kraken Slayer
Core
Build every game

Nashor's Tooth
Core
Build every game

Rabadon's
Core
Build every game

Mercury's Treads
Defensive
MR + tenacity vs Karthus's AP damage and CC
Karthus

Liandry's Anguish
Core
Build every game

Shadowflame
Core
Build every game

Rabadon's
Core
Build every game

Zhonya's Hourglass
Counter
Stasis to survive assassin burst
Kai'Sa's Worst Matchups
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