Hello! This is my first build. I constantly play Kennen, tried many builds ( AD, Magic Penetration AP etc.). Was thinking about most effecting build and here is what I found :)

Was buying nearly 15 k ip worth runes for Kennen for different builds. Funny thing is energy regen alows u to throw spells more often. Cooldown reduction do the same thing so u can think... Or i will ult my enemies every 2nd teamfight and pwn them hard or i will ult every teamfight pwn less but will have full set of spells every 3-4 secs

Marks: Magic Penetration
Seals: Combined energy regenarion per level and flat
Glyphs: Combined Cooldown reduction per level and flat
Quintessences: ( Tried 3 X move speed to add marks from passive early game its good but i prefer more energy regen so 1X energy regen 1X Move speed 1X cooldown reduction per level

Considering u use this glyphs u dont need utility at all it would work for us if thewre would be some energy regen but there is no so we focus survivability and and a little on atack. 9/21/0 Masteries are sort of unique for me :) play many champions that way.

Starting with ruby crystal makes u not so squishy early game its good for laning and in mid. If u going mid and get sort of 2500 till u 1st time going to base buy Kindlegem, CD boots and Mejal's Soulstealer ( btw this builds core item is mejalis i know that sux but if u play right u will get stacks and money for more powerfull items) at that stage u have CD about 35% ( 40 will be soon without blue buff). As soon as u can go buy Giants belt. That item makes Kennen a bit tanky. After that u go FULL AP u did ur job on Cooldowns and now spam spells like never :D

Reason i dont max Shuriken first is that i am bad in aiming it :P. Expirienced Kennen players feel free to max it first and whatever skill order u like! Is not a must to build like me its just a way i do it!

Cleanse/Flash is what i always use for Kennen! there are much more usefull spells for him this 2 gives him great escape and more benefits. Examples: Viegar used his stun ure stunned like 2 of ur teammates! cleanse flash among them R,E,W, and when fallback a bit spamm shurikens (Q)
at least u prevent your enemies from killing all of your stuned mates(they fall back cuz u nuked them hard and will not stay with 1/3 hp on battlefield!

I am sorry for my nub english. I am not englishman and I am not interested in perfecioning it!
I hope you all cant understand at least importance of Cooldown Kennen. with this items,runes,masteries isnt much of a matter how i play it but how will you play it! Enjoy HF!

P.S. I didnt placed Seals in build because i couldnt find energy regen seals i am sorry for that but read RUNES chapter