Fettering shot
rogue attack 23
ranged weapon
Requirement: wielding a crossbow, a light thrown weapon, or a sling.
Target: one creature
Attack: Dexterity vs. AC
Hit: "4[W] + Dexterity modifier damage, and the target is immobilized until the end of your next turn."[MP:85]
Fettering shot is an encounter power available to rogues at 23th level.