Numbing shot
rogue attack 13
ranged weapon
Requirement: wielding a sling
Target: one creature
Attack: Dexterity vs. Fortitude
Hit: "2[W] + Dexterity modifier damage, you knock the target prone, and the target is weakened until the end of your next turn."[MP2:64]
Numbing shot is an encounter power available to rogues at 13th level.