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Karthus vs Kai'Sa

Karthus
vs
Not enough games
Kai'Sa
Analyze a draft with Karthus
Sustained DPSHigh burstHeavy AP damageHeavy AD damage

Build vs Kai'Sa

The champion's reference build, for lack of enough games in this matchup

Recommended items for Karthus: Blackfire Torch, Shadowflame, Rabadon's Deathcap, Sorcerer's Shoes, Void Staff, Zhonya's Hourglass, Stormsurge, Malignance.

Starting items

Scorchclaw Pup

Core build

Blackfire Torch
1
Shadowflame
2
Rabadon's Deathcap
3

Standard

Sorcerer's Shoes
4Magic pen
Void Staff
5

Summoner spells

ExhaustSmite50%
FlashSmite33%

Anti CC

Mercury's Treads
4vs CC

Other options

Void Staff
Zhonya's Hourglass
Stormsurge
Malignance
DominationDomination
Dark HarvestDark Harvest
Cheap ShotCheap Shot
Grisly MementosGrisly Mementos
Ultimate HunterUltimate Hunter
SorcerySorcery
Axiom ArcanistAxiom Arcanist
Gathering StormGathering Storm
Adaptive ForceAdaptive ForceHealth Scaling

Power Spikes

Strength by game phase

Kai'Sa's abilities

Passive, spells and ultimate

Second Skin (P)

Kai'Sa's basic attacks stack Plasma, dealing increasing bonus magic damage. Allies' immobilizing effects help stack Plasma. Additionally, Kai'Sa's item purchases upgrade her basic spells to have more powerful properties.

Cooldowns

Cooldowns by spell rank

LevelQWER
310s20s16s–
68s20s16s2m10
96s18.5s16s2m10
116s17s16s1m40
166s14s13s1m10
186s14s10s1m10

Playing as Karthus

Tips to maximize your impact

  1. Aim for isolated champions

    Aim Lay Waste (Q) at a champion away from their minions: if the blast hits only one enemy, it deals much more damage.

  2. Wall before your combo

    Place Wall of Pain (W) in their path before your combo: anyone who crosses it is slowed and loses magic resist.

  3. Keep playing after you die

    After you die, keep casting your spells: Death Defied (passive) keeps you in spirit form for a while, and you can still cast Lay Waste (Q) and Requiem (R).

  4. Requiem for the finish

    Save Requiem (R) to finish off wounded enemies, often right after a teamfight: it hits every enemy champion wherever they are, after a 3-second channel.

Playing against Kai'Sa

How to counter and exploit weaknesses

  1. Stay near your minions

    Stay near your minions: Icathian Rain (Q) splits its missiles between nearby enemies, and on your own, you take them all.

  2. Harass her before she evolves

    If your attack range beats her 525 units, harass her early: Second Skin (passive) only evolves her spells as she buys items.

  3. Dodge her Void Seeker

    Dodge Void Seeker (W): it marks you with Plasma and reveals you, which lets Killer Instinct (R) dash onto you from very far away.

Other Karthus matchups

Patch 16.21.1