Your weapon crackles with divine lightning that arcs out to strike any who threaten your allies.

Encounter   ✦     Divine, Lightning, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 2[W] + Strength modifier lightning damage. Until the end of your next turn, any enemy takes 5 lightning damage if it ends its turn adjacent to any ally within 5 squares of you.

Published in Divine Power, page(s) 35.