Kai'Sa: change history

9 changes across 2 patches (Jun 23, 2026 to Jul 28, 2026), newest first. Nerf Radar tracks the 10 most recent official updates for League of Legends, back to May 27, 2026.

Buff 6Nerf 2Adjust 1

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Jul 28, 2026League of Legends Patch 26.15Buff 4Nerf 2Adjust 1Official notes ↗

Buff

Summoner's Rift Passive - Second Skin · Caustic Wounds
Caustic Wounds on Kai'Sa's Second Skin (Passive) increase from 4–24 (Champion level) (+12% ability power), +1–6 (Champion level) (+3% ability power) per prior stack to 4–30 (Champion level) (+12% ability power), +1–8 (Champion level) (+3% ability power) per prior stack.
4–24 (Champion level) (+12% ability power), +1–6 (Champion level) (+3% ability power) per prior stack→4–30 (Champion level) (+12% ability power), +1–8 (Champion level) (+3% ability power) per prior stack

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Caustic Wounds: 4 - 24 (Champion Level) (+12% Ability Power), +1 - 6 (Champion Level) (+3% Ability Power) per prior stack → 4 - 30 (Champion Level) (+12% Ability Power), +1 - 8 (Champion Level) (+3% Ability Power) per prior stack

Adjust

ARAM: Mayhem Damage Taken
Kai'Sa's damage taken modifier changes from 10% to 0%.
10%→0%

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Damage Taken: 10% → 0%

Buff

Arena Passive - Second Skin · Arena On-Hit Damage Modifier
On-hit damage modifier on Kai'Sa's Second Skin (Passive) increases from 50% to 100%.
50%→100%

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Arena On-Hit Damage Modifier: 50% → 100%

Buff

Arena Passive - Second Skin · Detonation Damage
Detonation damage on Kai'Sa's Second Skin (Passive) increases from 10% missing health to 15% missing health.
10% missing health→15% missing health

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Detonation Damage: 10% missing Health → 15% missing Health

Nerf

Arena Passive - Second Skin · Ability Power Ratio
Ability power ratio on Kai'Sa's Second Skin (Passive) decreases from 30% to 12%.
30%→12%

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Ability Power Ratio: 30% → 12%

Nerf

Arena Passive - Second Skin · Ability Power Ratio per Stack
Ability power ratio per stack on Kai'Sa's Second Skin (Passive) decreases from 5% to 3%.
5%→3%

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Ability Power Ratio per Stack: 5% → 3%

Buff

Arena Q - Icathian Rain · Ability Power Ratio
Ability power ratio on Kai'Sa's Icathian Rain (Q) increases from 15% to 20%.
15%→20%

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Ability Power Ratio: 15% → 20%
Jun 23, 2026League of Legends Patch 26.13Buff 2Official notes ↗

Buff

Summoner's Rift W - Void Seeker · Cooldown
Cooldown on Kai'Sa's Void Seeker (W) decreases from 22 / 20 / 18 / 16 / 14 to 20 / 18.5 / 17 / 15.5 / 14.
22 / 20 / 18 / 16 / 14→20 / 18.5 / 17 / 15.5 / 14

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Cooldown: 22 / 20 / 18 / 16 / 14 → 20 / 18.5 / 17 / 15.5 / 14

Buff

Summoner's Rift R - Killer Instinct · Shield
Shield on Kai'Sa's Killer Instinct (R) increases from 70 / 90 / 110 (+90 / 135 / 180% AD) (+120% AP) to 100 / 150 / 200 (+90 / 135 / 180% AD) (+120% AP).
70 / 90 / 110 (+90 / 135 / 180% AD) (+120% AP)→100 / 150 / 200 (+90 / 135 / 180% AD) (+120% AP)

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Shield: 70 / 90 / 110 (+90 / 135 / 180% AD) (+120% AP) → 100 / 150 / 200 (+90 / 135 / 180% AD) (+120% AP)

Each step links to the full patch breakdown and to Riot Games's official notes. Changes listed under a general heading such as "Bug fixes" are not included here; search to find every mention.