Twilight Adept [Multiclass Rogue]

Heroic Tier
Prerequisite: Dex 13 or Int 13
Benefit: You gain training in Stealth.
Once per encounter, you can use a free action during your turn to gain the benefit of the rogue class feature Cunning Sneak until the end of your turn.

Published in Martial Power 2, page(s) 146.