What changed for Kai'Sa?

9 changes across 2 patches (Jun 23, 2026 to Jul 28, 2026), newest first.

1. 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

   Source line

   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%

   Source line

   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%

   Source line

   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

   Source line

   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%

   Source line

   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%

   Source line

   Ability Power Ratio per Stack: 5% → 3%

   1 more change in this patch →
2. 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

   Source line

   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)

   Source line

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