Nightmare's Keen SensesLevel 11 Uncommon

Your other senses come to the fore when your vision fails you.

Grandmaster Training        9,000 gp

Property

You can make a Perception check to locate a hidden enemy as a free action once on your turn.

Power (Augmentable, Psychic) ✦ Daily (No Action)

Trigger: You would make a melee attack against a target with partial concealment or superior concealment.

Effect: Your attack ignores concealment.

Augment 1: As above, and you gain combat advantage for this attack.

Published in Dragon Magazine 393.