Kalista

Hip Hop a Potamus

Lane harassment and consistent damage output.

Precision

Improved attacks and sustained damage

Lethal Tempo

Attacking an enemy champion grants you Attack Speed, up to 6 stacks. At max stacks, deal bonus adaptive damage On-Attack.
Absorb Life

Killing a target heals you.
Legend: Bloodline

Takedowns on enemies grant permanent Life Steal, up to a cap. Once the cap is reached, increase your max health. Weaker earlier but stronger later game than other Legend Runes.
Cut Down

Deal more damage to high health enemy champions.

Sorcery

Empowered abilities and resource manipulation

Absolute Focus

While above 70% health, gain extra adaptive damage.
Gathering Storm

Gain increasing amounts of AD or AP, adaptive over the course of the game.

Adaptive Force

+9 Adaptive Force
Adaptive Force

+9 Adaptive Force
Health Scaling

+10-180 Health (based on level)

Why Lethal Tempo

Kalista is all about building as many [E] stacks as she possibly can to execute her targets and the burst of Attack Speed from Lethal tempo lets you do just that in a manner of seconds.

Why Absorb Life

Overheal is a rune that synergizes well with Kalista's natural Life Steal item build to keep her topped off with a shield.

Why Legend: Bloodline

Kalista is all about attacking quickly to build [E] Rend stacks, and as such with each attack you are capable of life stealing. The extra bit of life steal allows you to tank more hits and sustain through the laning phase/trades.

Why Cut Down

Cut Down massively buffs your damage against front-line champions as well as mid laners who typically build Morellos or any other health item.

WhyAbsolute Focus

Thanks to Kalista's natural Life Steal build, you should be able to stay above Absolute Focus' threshhold for the majority of the game granting you even more AD and lifesteal.

WhyGathering Storm

Gathering Storm is fantastic for further empowering late game AD Carries, epseically those who build a lot of Crit or Life Steal so that you can take over teamfights.