Senna Ability (LoL): Last Embrace

Senna sends forth a wave of Black Mist, which latches on to the first enemy hit, dealing 70 / 115 / 160 / 205 / 250 (+0.7 per bonus attack damage) physical damage. After a 1 second delay the target and other nearby enemies are rooted for 1.25 / 1.50 / 1.75 / 2 / 2.25 seconds.