Kai'Sa

Arena changes

• I: On-hit damage changed to 50% value.
• I: Detonation base damage changed to 10% of target's missing health.
• I: Stat Bonus bonuses count toward evolutions.
• I: Shardholder Value shards do not.
• Q: Bonus AD ratio per missile changed to 50% bonus AD.
• Q: AP ratio per missile changed to 15% AP.²

Arena On-Hit Damage Modifier changed to 100% in patch 26.15 (was 50%)³

Ability Power Ratio changed to 20% in patch 26.15 (was 15%)³

• Hexbolt and Magic Missile are recommended for Kai'Sa, with tank items to help her avoid being killed while getting in range.⁴
• Kai'Sa can use all stats in Stat Run builds.⁵

• Ethereal Weapon can make Kai'Sa stack her passive faster.⁶
• Stat Run can activate Kai'Sa's evolutions, but a good prismatic item is needed to help obtain it early.⁷
• With Double Tap, Dual Wield, Twice Thrice, and Guinsoo's, Kai'Sa could trigger her passive with one attack.⁸
• Shardholder can reset Kai'Sa's evolution progress.⁹
• Kai'Sa benefits more from Stat Anvil builds than most champions because she has dual scaling.¹⁰
• Reaper's Toll with an augment that amplifies on-hit effects, such as Dual Wield, Twice Thrice, or Critical Tap, can help Kai'Sa shred tanks.¹¹

Earlier formats

• Since patch 25.22, Kai'Sa's passive plays a stereo sound effect when she evolves, and the evolve sound no longer plays twice for her; nearby players hear it fade out more naturally. The kill counter sound effect also plays correctly after the taunt fix.¹³¹⁴ 8x2 duos
• Ethereal Weapon with Dusk and Dawn can trigger Kai'Sa's full passive with one W.¹⁵ 8x2 duos
• Blade Waltz is one of Kai'Sa's best augments because its invulnerability frames and passive triggers work together.¹⁶ 8x2 duos
• The 70 AP augment does not work with Kai'Sa's W evolution.¹⁷ 8x2 duos
• Kai'Sa's W could be used during her ultimate, and W and an attack could be queued during the ultimate.¹⁸ 8x2 duos
• Kai'Sa's Q had 50% bonus AD scaling per missile.¹² 8x2 duos