PassiveMark of the StormKennen marks enemies when hitting them with abilities. Once three marks are applied the target is stunned.
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PassiveMark of the Storm 
QThundering Shuriken
WElectrical Surge
ELightning Rush
RSlicing Maelstrom
Classic champion edition
Kennen
ClassicThe Heart of the Tempest · Mage
Champion abilities
Review the Classic kit and client description. Classic data stays separate from the modern edition.
PassiveMark of the StormQThundering ShurikenKennen throws a fast moving shuriken towards a location, causing damage and adding a Mark of Storm to any opponent that it hits.
WElectrical SurgeKennen passively deals extra damage and adds a Mark of the Storm to his target every few attacks, and he can activate this ability to damage and add another Mark of the Storm to targets who are already marked.
ELightning RushKennen morphs into a lightning form, enabling him to pass through units. Any enemy unit he runs through takes damage and gets a Mark of the Storm.
RSlicing MaelstromKennen summons a storm that strikes at random nearby enemy champions for magical damage.