Swordmage Attack 1Crackling Burst
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.