Killer's gift
rogue attack 27
Requirement: wielding a crossbow, a light blade, or a sling.
Target: one creature from which you are hidden
Attack: Dexterity vs. AC
Hit: "2[W] + Dexterity modifier damage, and you slide the target 1 square. The target is stunned until the end of your next turn."
Cunning Sneak: The number of squares you slide the target equals your Intelligence modifier.[MP2:71]
Killer's gift is an encounter power available to rogues at 27th level.