All damage from the Shaman increased by 15%. Moving X yards from the Shaman breaks the cling.
After you use Stormstrike twice in a row on an enemy you create a coil of lightning binding you to the target, increasing the damage the target receives from your attacks by 15% and increases your movement speed by X% while the cling holds.
If the target moves further than 15 yards from you, the cling will break.
