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the Heart of the Tempest

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Mark of the Storm (Passive)
Kennen's abilities add one stack of Mark of the Storm to their target for 6 seconds. If the target reaches 3 stacks, it is stunned for 1.25 seconds and Kennen gains 25 Energy.

The stun will be a diminished duration of 0.5 seconds if it occurs again within 6 seconds.

Thundering Shuriken (Q)
Cooldown: 8/7/6/5/4 Cost: 60/55/50/45/40 Energy Range: 950
Throws a shuriken that deals 75/115/155/195/235 (+75% Ability Power) magic damage to the first enemy it hits.

Electrical Surge (W)
Cooldown: 14/12/10/8/6 Cost: 40 Energy Range: 750
Passive: Every 5 attacks, Kennen deals bonus magic damage equal to 40/50/60/70/80% of his attack damage and adds a Mark of the Storm to his target.

Active: Sends a surge of electricity through all nearby targets affected by Mark of the Storm or Slicing Maelstrom, dealing 65/95/125/155/185 (+55% Ability Power) magic damage.

Lightning Rush (E)
Cooldown: 10/9/8/7/6 Cost: 100/95/90/85/80 Energy Range: Self
Kennen doubles his base movement speed and ignores unit collision for 2 seconds, dealing 85/125/165/205/245 (+60% Ability Power) magic damage to any enemy he passes through. Additionally, Kennen will gain 10/20/30/40/50 Armor and Magic Resist for 4 seconds.

Kennen gains 40 Energy the first time he passes through an enemy.
Lightning Rush deals half damage to minions.

Slicing Maelstrom (R)
Cooldown: 120 Cost: No Cost Range: 550
Summons a magical storm for 3 seconds that deals 80/145/210 (+40% Ability Power) magic damage to all enemies near Kennen every 0.5 seconds. Each hit applies Mark of the Storm, up to a maximum of 3.

Each time an enemy is struck, further hits deal 25% less damage (minimum of 50% damage).

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