You land a ringing blow against your foe, inspiring a nearby ally to do the same, but harder.

Encounter   ✦     Martial, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. Reflex

Hit: 1[W] + Strength modifier damage. One ally adjacent to the target can make a melee basic attack against it as a free action, with a bonus to the damage roll equal to your Charisma modifier.

Published in Player's Handbook, page(s) 145, Class Compendium.