Kennen

Innate: Kennen's abilities apply a stack of Mark of the Storm to enemies hit for 6 seconds, refreshing on subsequent applications and stacking up to 3 times.

The third stack against a target consumes them all to stun them for 1.25 seconds and restore 25 energy. The stun duration is reduced to 0.5 seconds if this occurs on the same target again within 6 seconds.

Active: Kennen throws a shuriken in the target direction that deals magic damage to the first enemy hit.

Passive: Kennen's basic attacks on-attack generate a stack of Electrical Surge, stacking up to 4 times. At 4 stacks, his next basic attack on-attack consumes all stacks to both deal bonus magic damage and apply a stack of Mark of the Storm on-hit. This damage can critically strike for (140% + 12%) damage.
Kennen gains maximum stacks of Electrical Surge upon respawning.

Active: Kennen sends out a surge of electricity that deals magic damage to all nearby enemies afflicted by Mark of the Storm or within Slicing Maelstrom.

Active: Kennen turns into lightning for 2 seconds, becoming unable to declare basic attacks but gaining ghosting and 100% bonus movement speed. He deals magic damage to enemies he passes through, reduced to 65% against non-champions, and restores 40 energy upon damaging at least one enemy.

Lightning Rush can be recast after 0.5 seconds, and does so automatically after the duration.

Recast: Kennen ends Lightning Rush to gain bonus attack speed and be allowed to exceed the attack speed cap by the amount gained for 4 seconds. Critical strikes extend the bonus attack speed's duration by 1 second, up to the original duration.

Active: Kennen summons a storm around himself for 3 seconds, gaining bonus armor and bonus magic resistance for the duration.

The storm strikes lightning bolts down on nearby enemies every 0.5 seconds, each one dealing magic damage.

Slicing Maelstrom gains 10% additional damage for each subsequent strike a target has received, up to a combined total of 150% of the initial strike's damage.