Until you choose to burst into action, you can move around the battlefield unseen.

Daily   ✦     Martial
Minor Action      Personal

Prerequisite: You must have training in Stealth.

Requirement: You must be hidden.

Effect: You are invisible until the end of the encounter. The invisibility ends if you move more than 2 squares during your turn or make any attack other than a basic attack or an at-will attack.

Update (10/4/2011)
Updated in Class Compendium.

Published in Player's Handbook, page(s) 125, Class Compendium.