D&D4 Wiki
Veiled missile
rogue attack 13

Requirement: wielding a crossbow, a light blade, or a sling.

Target: one creature

Attack: Dexterity vs. Reflex

Hit: "3[W] + Dexterity modifier damage. You gain concealment against the target until the end of your next turn."
Cunning Sneak: You can make a Stealth check to become hidden.[MP2:66]

Veiled missile is an encounter power available to rogues at 13th level.