Lightning Shield

Instant cast
The caster is surrounded by 3 balls of lightning. When a spell, melee or ranged attack hits the caster, the attacker will be struck for 375 Nature damage. This expends one lightning ball. Only one ball will fire every few seconds. Lasts 10 min. Only one Elemental Shield can be active on the Shaman at any one time.

Aura tooltip

Deals Nature damage to attackers.
10 minutes remaining

Effect #1

Apply Aura: Proc Trigger Spell (Lightning Shield)
Value: 13