Your weapon glows with astral light, and as it strikes your enemy, that glow spreads to encompass all enemies adjacent to you, temporarily coating them with a glowing target your allies can see.

Encounter   ✦     Divine, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. AC

Hit: 2[W] + Strength modifier damage, and until the end of your next turn, your allies have combat advantage against any enemy adjacent to you.

Published in Player's Handbook, page(s) 100.