Xin Zhao Ability (LoL): Crescent Guard

The last champion Xin Zhao damaged with an attack or Audacious Charge is Challenged for 3 seconds. Xin Zhao unleashes a sweep around him that deals 75 / 175 / 275 (+110% of ability power) (+1.0 per bonus attack damage) plus 15% current health as physical damage and knocks back all non-Challenged enemies. Afterwards, Xin Zhao becomes immune to damage from enemies outside the sweep range for 4 seconds.