Every time Divine Shield is cast, she will select the allied unit with the lowest HP as a target to block one long-range attack. If blocked, she will add a shield to attack's target. Cannot be silenced.
Targets marked by Ariel will take extra dmg when attacked by allied heroes, and also take extra dmg as a percentage of total dmg received while marked. Each time Ariel uses Clean Slate to attack a target, a mark will be cast onto the target (this does not stack).