I played her a lot recently and love her kit, but have questions about her build.
Items that I definitely build
My Sixth item I'm never sure about;
Sometimes I build 
for the AP bonus on my W
other times I just stack more AD/AS/LS with 
.
I'm new to both the ADC role and Kai'sa. Is enhancing W important or is Bork the best option?
? ?
My dude, dude dudity dude, no. Spellvaml from 
and is way better than lifesteal because you get to actually heal from your Q and W damage, and spellvamp works through Supercharge'd AA's too. is definetly a crit item she would use because runaan's additional arrows stack her passive plasma. is a core item on every build as her AA's double the amount of plasma they can stack(so instead of proccing plasma on 5 AA's you'd proc it on 3 AA's like 
's basic silverbolts), and if you want to evolve W then going for rush after Guinsoo's is a good idea, both items have AP and attack speed which kai'sa really likes.
And, the key is to always rush as you can evolve any spell after the next purchase(say, i get to evolve Q when I buy after , or W when I buy after ).
Crit-hybrid Kai'sa is really fun to play as well, but due to her W buffs her meta buuld forces her to go full ap.
after also advances the Q plus you get the shield from BT that stacks with your R.
Even though pros and high-elo players now build her AD, I'm still playing her AP.
I've been playing, SPAMMING Kai'Sa for the last few days, so I'll tell you about my experience with her.
#BUILD
I'm always rushing first. It's far too good to not take it.
I'm buying it because rushing makes you far too weak.
Afterwards, I buy > > > 
I buy boots second, but they are situational. If I were to build however I like, I'd either take or 
.
With and , you can evolve both your Q and your E. With , you can evolve your W.
This build is aiming for AP, but has some AD. To be honest, I just wanted a build that allowed me to evolve all my skills.
I'm running AP Kai'Sa because I genuinely think it's better. Her plasma only scales with AP, and her W does so much damage when you're going AP.
AD or AP, her shield with Killer Instinct is really thick.
You can have a better lifesteal with an AD build, but does the job too. ( and it has an active that slows and hurts )
Kai'Sa is a strong duelist, pretty much like Vayne. She can 1v1 anyone if she plays well and isn't facing an opponent that is more fed than she is. ( she might die before she kills her target, but she has an outplay potential with her R )
A lot of times, when I was chased an low on HP, I fired my W. The opponent is marked by plasma, and as soon as they want to engage on me, I E then Q, AA if they're not dead yet and boop. Dead.
If you're going AP, the damage and the plasma stacks it will give you is INSANE.
You're low > Opponent chase you > You use W > It chunks their health bar and mark them but they still think they'll be able to kill you > You Q > They are dead
People underestimate the damage when your plasma detonates. AP Kai'Sa is all about detoning the plasma in order to destroy your opponents.
