Kennen, the Heart of the Tempest
Kennen is a spaztic yordle of pure amazingness. His lightning spells, when used correctly, can win you a team fight due to his single-target burst + stun and AoE burst + stun. Also, with his built-in Ghost spell Lightning Rush, the little bugger is a pain to get away from or chase. My build is a tanky AP build that nets Kennen amazing survivability while also letting him destroy enemies.
Let's get a little background on his abilities first.
Automatic Passive: Mark of the Storm
|Kennen's abilities add Marks of the Storm to opponents. Upon receiving 3 Marks of Storm, an opponent is stunned and Kennen receives 25 energy.|
Q: Thundering Shuriken
|Kennen throws a shuriken that damages the first enemy it hits for 75/115/155/195/235 (+0.66) magic damage and adds a Mark of the Storm.|
W: Electrical Surge
Passive: Every 5 attacks, Kennen deals magic damage equal to 40/50/60/70/80% of his attack damage and adds a Mark of the Storm to his target.
Active: Surges electricity through all nearby targets afflicted by Mark of the Storm, dealing 65/95/125/155/185 (+0.45) magic damage and adding another mark.
E: Lightning Rush
|Kennen moves very fast and gains the ability to pass through units, dealing 85/125/165/205/245 (+0.55) magic damage and adding a Mark of the Storm to any hostile unit he passes through. Kennen is refunded 40 energy if he passes through an enemy while using this spell, but can only gain this effect once. Lightning Rush deals half damage to minions.|
R: Slicing Maelstrom
|Kennen summons a magical storm that deals 80/145/210 (+0.33) magic damage to a random enemy champion near Kennen every 0.5 seconds. This storm attacks up to 6/8/10 times and cannot hit the same target more than 3 times. A Mark of the Storm is applied to enemies on the first bolt they are hit by.|
Next up are what summoner spells you should take when playing my Kennen build.
Spell 1: Ignite or Cleanse. This is all dependant on your playstyle preference, but I always go with Ignite cause I'm so offensive with him.
Spell 2: Flash. Duh.
Due to Kennen being dependant on Energy instead of Mana, his masteries are a little wack compared to other casters.
Archmage's Savvy: 3/3
Blazing Embers: 1/1
Archaic Knowledge: 1/1
Good Hands: 2/3
Utility Mastery: 2/2
Blink of an Eye: 1/1
Marks: Greater Insight (+.95 Magic Penetration)
Seals: Greater Force (+.1 Ability Power per level / +1.8 at level 18)
Glyphs: Greater Focus (-.65% Cooldowns)
Quintessences: Greater Fortitude (+32.4 Health)
Your main focus should be Eletrical Surge. Other than that, upgrade the other two skills evenly and get your ult anytime you can.
Level 1: [W] Eletrical Surge 1
Level 2: [Q] Thundering Shuriken 1
Level 3: [W] 2
Level 4: [E] Lightning Rush 1
Level 5: [E] 2
Level 6: [R] Slicing Maelstrom 1
Level 7: [W] 3
Level 8: [Q] 2
Level 9: [W] 4
Level 10: [Q] 3
Level 11: [R] 2
Level 12: [E] 3
Level 13: [W] 5
Level 14: [Q] 4
Level 15: [E] 4
Level 16: [R] 3
Level 17: [Q] 5
Level 18: [E] 5
Kennen's item build varies slightly depending on the situation, but it's generally the same.
Doran's Ring (Always) [Sell at the end for Zhonya's if need be]
Rylai's Crystal Scepter (Always)
Sunfire Cape (Always)
Abyssal Scepter: If you need Magic Resistance.
Guardian Angel: If you're dying too often.
Mercury Treads: If there's lots of enemy CC.
Mejai's Soulstealer: If you're stomping the enemies hardcore.
NOTE: With this guide I am assuming you are soloing mid. If not, things will be slightly different.
NOTE: Items with 's around them means that you may be able to afford at the time if you're doing really well. Items with ()'s around them are Situational Items.
Auto-attack creeps that aren't in danger of dying soon to charge up your W, then hit your enemy solo-midder with the Mark attack then activate W. Do this anytime you can safely do so. Be sure to be last-hitting as many minions as possible while harassing the enemy as well. Avoid using Lightning Rush unless the enemy gets cocky and leaves him/herself open for a death. Try not to spam Shuriken unless you have a good shot. If you start getting harassed yourself, stay back and just farm. Try to avoid having to recall until you have at least 1460 gold to buy a Giant's Belt and Boots of Speed.
Items: Doran's Ring, Giant's Belt (Mejai's Soulstealer), Boots of Speed, [Amplifying Tome].
Start roaming and ganking as you see fit, but don't let mid lane die in the process. Only ever take golem/lizard if none of your allies need it/it's more useful for them. Help with dragon when needed, but don't try to solo it unless you have your Rylai's. By now, you should be able to farm whole creep waves easily by using Lightning Rush --> Eletric Surge then last-hitting all of them. Contine farming and/or roaming until the all-mid showdown begins. Once it does, be sure to constantly snipe enemies with your Thundering Shuriken when the teams aren't in a huge battle. When the battles do commence, try to stay back until the initial blasts have gone off, then Lightning Rush in, use Electric Surge, Ignite an enemy while doing so, pop Maelstrom, and spam Shuriken + auto-attacks on the target. Use your skills as needed to finish the enemies off or get away.
Items: Sorceror's Shoes (Mercury Treads), Rylai's Crystal Scepter, Sunfire Cape, [Abyssal Scepter / Guardian Angel / Sunfire Cape #2]
By now, your damage will have dropped off a bit because of you only have 2 (3) AP items. Don't fret! That's what the Sunfire Cape(s) is(are) for. You should be a tanky kamikazi bomb of pure destruction and be one of the main initators for fights now. Lightning Rush in and use the regular skill combo while you laugh as they aim at you instead of your carry(ies).
Items: Sunfire Cape #2 (Abyssal Scepter / Guardian Angel), Zhonya's Ring.
This is my story.. I mean Kennen guide: use it well and enjoy being the yordle of chaotic death and destruction.