Your weapon sends out sprawling arcs of lightning that hit nearby creatures, making movement agonizing for them.

Encounter   ✦     Arcane, Implement, Lightning
Standard Action      Close burst 1

Target: Each creature in the burst

Attack: Intelligence vs. Reflex

Hit: 1d8 lightning damage. If the target moves during its next turn, it takes lightning damage equal to your Intelligence modifier.

Published in Arcane Power, page(s) 51.