The small metal ball you roll at your enemies bursts apart in an explosion of lightning.

Encounter   ✦     Arcane, Implement, Lightning
Standard Action      Area burst 1 within 10 squares

Target: Each enemy in the burst

Attack: Intelligence vs. Fortitude

Hit: 1d8 + Intelligence modifier lightning damage, and the target grants combat advantage until the end of your next turn.

Published in Eberron Player's Guide, page(s) 49.