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Fettering shot
rogue attack 23

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.