Kennen

Charge up, gaining 15% Ability Power per Burning enemy. Then, gain 250/350/3000 Shield for 2.5 seconds and rush through a nearby group of enemies, dealing 80/120/1500 magic damage to each. After rushing, unleash a 2 Hex firestorm that deals a total of 475/715/5000 magic damage split among all enemies hit over 2 seconds.