Sejuani Ability (LoL): Flail of the Northern Winds

Sejuani's next basic attack deals 4 / 4.5 / 5 / 5.5 / 6 % of her target's maximum health (+3% per 100 ability power) as bonus magic damage to her target and all nearby enemies. She then swings her flail, dealing 40 / 70 / 100 / 130 / 160 (+4 / 6 / 8 / 10 / 12 % of maximum health) (+60% of ability power) magic damage to nearby enemies over 4 seconds. If this ability is reactivated, Sejuani immediately starts swinging her flail.