With a peal of thunder, a storm cloud laden with dancing bolts of lightning appears and lashes out at your foe, then lingers to empower the attacks of your allies.

Daily   ✦     Implement, Lightning, Primal, Thunder, Zone
Standard Action      Area burst 5 within 10 squares

Target: One creature

Attack: Wisdom vs. Reflex

Hit: 3d6 + Wisdom modifier lightning damage.

Effect: The burst creates a zone of thunder that lasts until the end of the encounter. Any ally deals 1d6 extra thunder damage when he or she hits an enemy that is within the zone.

Published in Player's Handbook 2, page(s) 125.