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
Karthus
VS
Champion 2
Rek'Sai
vs

44.4%
Karthus win rate vs Rek'Sai
Rek'Sai hard counters Karthus
142
Games Analyzed
44.4%
Karthus WR
55.6%
Rek'Sai WR
-450
Avg Gold Diff @15
Karthus
DamageAP
StyleSustained
RangeRanged
Difficulty**---
StrongLate game
RunesDark Harvest / Inspiration
SummsFlash + Smite
Rek'Sai
DamageAD
StyleAll-in
RangeMelee
Difficulty***--
StrongEarly game
RunesConqueror / Resolve
SummsFlash + Smite
Power Spike Timeline
Rek'Sai
Level 3
Karthus
Level 6
Rek'Sai
Level 6
Karthus
1 item
Rek'Sai
1 item
Karthus
3 items
How to Play This Matchup
Survive to Scale
Rek'Sai will try to bully you early. Give up CS if needed  your job is to not die. Karthus outscales hard after 2 items. Play for farm, not fights.
Mixed Resistances
Karthus deals AP damage while Rek'Sai deals AD. Build resistances accordingly  don't stack the wrong type.
Range Advantage
Karthus has range advantage. Rek'Sai should look for short trades when Karthus uses abilities on the wave. Freeze near your tower and wait for jungle help or an all-in window.
Exploit Karthus's Weakness
Karthus's main weakness: Invaded early, immobile, Zhonya's blocks R. Play around this to maximize your advantage.
Karthus Win Condition
R global damage, passive keeps dealing damage after death
Rek'Sai Win Condition
Tunnel ganks, tremor sense vision, R execute
Recommended Items
Karthus

Liandry's Anguish
Core
Build every game

Shadowflame
Core
Build every game

Rabadon's
Core
Build every game

Plated Steelcaps
Defensive
Armor boots vs Rek'Sai's AD damage
Rek'Sai

Eclipse
Core
Build every game

Black Cleaver
Core
Build every game

Death's Dance
Core
Build every game

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

Hexdrinker
Counter
Magic damage shield vs Karthus's burst
Karthus's Worst Matchups
Rek'Sai's Worst Matchups
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