TFT Set 18.1
Kennen, a 5-cost Executioner unit in TFT Set 18

Kennen

5 Magic Assassin 
Firestorm
Charge up, gaining 15% Ability Power per Burning enemy. Then, gain 250 / 350 / 3000 Ability Power Shield for 2.5 seconds and rush through a nearby group of enemies, dealing 80 / 120 / 1500 Ability Power magic damage to each. 

After rushing, unleash a 2 Hex firestorm that deals a total of 475 / 715 / 5000 Ability Power magic damage split among all enemies hit over 2 seconds.
Ap Per Burning Enemy
15
Shield
250 / 350 / 3000 Ability Power
Shield Duration
2.5
Magic Damage (1)
80 / 120 / 1500 Ability Power
Firestorm Hex Radius
2
Magic Damage (2)
475 / 715 / 5000 Ability Power
Firestorm Duration
2

Traits

  • Executioner
  • Inferno 
    Inferno damage Burns and Wounds enemies for 4 seconds. Inferno Burns stack with other Burns.

Kennen enables

  • Shield

    Grants temporary HP that absorbs damage before the unit's real Health is touched.

  • Ability Power

    Scales with Ability Power (AP). Champions and effects flagged as AP-scaling get bigger damage, healing, or shield values when the holder stacks AP from items like Jeweled Gauntlet, Rabadon's Deathcap, and Nashor's Tooth, or from trait bonuses.

Kennen benefits from

  • Burn

    Deals a percent of the target's maximum Health as true damage every second. Most burn sources also apply Wound, which reduces healing received — together they form the standard answer to high-Health frontlines.