Enemies hit by Kennen's spells receive one Mark of the Storm, which lasts for 8 seconds. These marks stack and upon receiving 3 Marks of the Storm, they detonate to stun the target for 1 second and grant Kennen 25 energy. If the stun is applied more than once within 7 seconds, it has a diminished effect so it will only stun for approximately 0.5 seconds.
Thundering Shuriken
Range: 1050
Cooldown: 8 / 7 / 6 / 5 / 4
Cost: 65 / 60 / 55 / 50 / 45 energy
Active: Kennen throws a charged shuriken in a line in front of him, dealing magic damage and applying a Mark of the Storm to the first enemy that it hits.
Active: Kennen transforms into a ball of electricity for up to 3 seconds. While in this state Kennen gains 230 movement speed and ignores unit collision. Any enemies he passes through take magic damage and have a Mark of the Storm applied to them, dealing half damage to minions. Kennen also gains 40 energy from the first enemy he hits. Kennen cannot use basic attacks while Lightning Rush is active.
Additionally, for 4 seconds Kennen's armor and magic resistance are increased. While Lightning Rush is active, Kennen can activate it again to cancel the first part of the ability.
Active: Kennen summons a magical storm around himself that zaps a random enemy champion within range every fraction of a second, dealing magic damage and applying a Mark of the Storm. The storm hits several times, increasing with level, and cannot hit the same target more than 3 times.
Magic damage per bolt: 80 / 145 / 210 (+ 40% AP)
Maximum single target damage: 240 / 435 / 630 (+ 120% AP)
4800 or 
880
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