Enemies hit by Kennen's abilities receive one Mark of the Storm, which lasts for 6.25 seconds and stacks up to three times. At three stacks, the marks 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 and will only stun for approximately 0.5 seconds
Mark of the Storm is a debuff that automatically applies to any enemy Kennen damages with an ability.
Basic attacks against structures do not increment the counter nor consume the enhanced autoattack.
Electrical Surge's active will still hit stealthed champions and champions hidden in the Fog of War.
COST: 100 / 95 / 90 / 85 / 80 energy
COOLDOWN: 10 / 9 / 8 / 7 / 6
Active: Kennen transforms into a ball of electricity, ignoring unit collision and gaining 100% base movement speed for 2 seconds. Any enemies he passes through take magic damage (half to minions and monsters).
Lightning Rush will only damage any particular enemy once per cast.
The full movement speed boost of Lightning Rush brings Kennen over the first soft movement speed cap. Assuming Kennen is not being affected by any other movement speed modifiers, Lightning Rush is effectively a 230 movement speed boost.
The movement speed bonus and damage is separate from the bonus resistances. Cancelling the ability early will not remove the bonus defenses.
Active: Kennen summons a magical storm around himself that zaps a random enemy champion within range every fraction of a second, dealing magic damage.
Magic damage per bolt: 80 / 145 / 210 (+ 40% AP)
Maximum single target damage: 240 / 435 / 630 (+ 120% AP)
The storm hits several times, increasing with level, and cannot hit the same target more than 3 times.
Duration: 3 / 4 / 5
Number of bolts: 6 / 10 / 15
Time between bolts: 0.5 / 0.4 / 0.33
Slicing Maelstrom is an autotargeted point-blank area of effect ability.
Slicing Maelstrom will actually strike the same opponent in at least twice the time stated in the tooltip, as it cannot strike the same enemy for two consecutive ticks. If no other valid targets are available, it will not cast a bolt at all.