I go Mpen quints, mpen reds, cdr/lvl blues, ap/lvl yellows.
My reasoning is that the mpen is amazing early game and it works just fine mid-lategame (+13 and then with sorc boots you have 38mpen)
This allows you to not have to worry about your poor ap scaling mid game. And late game you're such a CC Powerhouse that it's all good.
I wouldn't get any more cdr than the cdr/lvl blues because there gets to a point where it's too much and your energy only regens so fast.
I personally go AP kennen, I dont know why you're getting a rageblade, and if you don't build hourglass you're not all you can be.
Sorc boots (well, it's debatable what kennen should get here, definitely not +3/+3+2 boots), hourglass, and abyssal are in my opinion the ultimate core items for kennen. You need to be pretty tanking to run into the enemy team and ult. Your E gives you bonus mr/def so if you have Hourglass and Abyssal then you'll be fine for your basic ability to take damage. Then get rylais so that you can slow them down and have that extra hp (you can get a rylais before abyssal, but I stress the importance of an Hourglass a lot).
Summoner skills: Flash is a MUST. Don't get ghost you have your E. Don't get teleport you move around plenty fast. Ignite is my favorite, although if you love Clairvoyance you could get that, the only thing else is that perhaps exhaust if your team needs one.
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