You spot a minor flaw in your foe's fighting style, one that you can exploit to deadly effect.

Daily   ✦     Psionic
Minor Action      Personal

Effect: Choose one enemy you can see. Until the end of the encounter, you gain a +2 power bonus to attack rolls against that enemy, and when you use battlemind at-will attacks that are unaugmented against that enemy, you can treat them as if they were augmented by 1 power point (level 1, 3, 7, 13, and 17 powers) or 2 power points (level 23 and 27 powers).

Published in Player's Handbook 3, page(s) 158.