This is a bonus 3rd-level power for rogues with the Thievery talent. Other rogues can choose it if they like.
Dexterity + Level vs. PD
Half of WEAPON + Dexterity damage (including Sneak Attack damage if any), and roll a normal save. If you succeed, you can pickpocket an item from the target that they are not holding. (If you roll 16+, the target doesn't realize you pickpocketed them.)