With a whistle, you signal to your allies to assault an enemy from all sides.

Encounter   ✦     Martial
Standard Action      Close burst 20

Target: You and one, two, or three allies in the burst

Effect: Choose an enemy. Each target can make a basic attack against the chosen enemy as a free action.

  Insightful Presence: The basic attacks deal extra damage equal to your Wisdom modifier or Charisma modifier.

Published in Martial Power 2, page(s) 95.