Kennen's Special ability will continue to damage and stun enemy champions while he is being revived from the effect of Guardian Angel. This allows him to not only be useful while reviving, but also allows him to be on the front line safely.
Active - Slicing Maelstrom: Summons a storm around him for 3 seconds, calling down lightning bolts on all enemies in the area every 0.5 seconds and dealing 300 / 450 / 900 (× SP) magic damage over the duration. Each enemy struck by 3 lightning bolts is stunned for 1.5 seconds.
Active - Slicing Maelstrom: Summons a storm around him for 3 seconds, dealing 50 / 80 / 110 magic damage each 0.5 seconds to nearby enemies, stunning for 1.5 seconds them after 3 hits. The storm can deal a total of 300 / 480 / 660 magic damage.