
Passive
Second Skin
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.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
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.

Q
Kai'Sa shoots a swarm of missiles that seek out nearby targets. Living Weapon: Icathian Rain is upgraded to shoot more missiles.
Base values from ability rank 1 upward.

W
Kai'Sa shoots a long range missile, marking enemies with her passive. Living Weapon: Void Seeker is upgraded to apply more passive marks and reduce cooldown on champion hit.
Base values from ability rank 1 upward.

E
Kai'Sa briefly increases her Move Speed, then increases her Attack Speed. Living Weapon: Supercharge is upgraded to briefly grant Invisibility.
Base values from ability rank 1 upward.

R
Kai'Sa dashes near an enemy champion.
Base values from ability rank 1 upward.