Tendon tear
rogue attack 23
Melee weapon
Requirement: wielding a light blade.
Target: one creature
Attack: Dexterity vs. AC
Hit: "3[W] + Dexterity modifier damage. You knock the target prone, and it is restrained until the end of your next turn."[MP2:69]
Tendon tear is an encounter power available to rogues at 23th level.