Perfect sniper
rogue attack 27
ranged weapon
Requirement: wielding a crossbow, a light blade, or a sling.
Target: one creature from which you are hidden
Attack: Dexterity vs. AC. If you have superior cover or total concealment, you remain hidden after the attack.
Cunning Sneak: You remain hidden after the attack if you have any cover or any concealment.
Hit: "5[W] + Dexterity modifier damage."[MP2:71]
Perfect sniper is an encounter power available to rogues at 27th level.