You jolt your foe's psyche, disrupting its concentration and allowing an ally to strike the foe during the lapse. By channeling more psionic energy, you can create an opening for several allies to exploit.

At-Will   ✦     Augmentable, Implement, Psionic
Standard Action      Ranged 10

Target: One creature

Attack: Intelligence vs. Will

Hit: One ally adjacent to the target can make an opportunity attack against it as a free action, with a bonus to the attack roll and the damage roll equal to your Charisma modifier.

Augment 1

Hit: As above, and the ally gains combat advantage for the opportunity attack.

Augment 4

Hit: Each of your allies adjacent to the target can make an opportunity attack against it as a free action, with a bonus to the attack roll and the damage roll equal to your Charisma modifier.

Published in Player's Handbook 3, page(s) 90.