Leg-breaker
rogue attack 7
Melee weapon
Requirement: wielding a light blade
Target: one creature
Attack: Dexterity vs. Fortitude
Hit: "2[W] + Dexterity modifier damage. If the target moves 2 squares or more during its next turn, it takes damage equal to your Dexterity modifier.
Brutal Scoundrel or Ruthless Ruffian: The damage the target takes for moving equals your Strength modifier + your Dexterity modifier."[MP2:62]
Leg-breaker is an encounter power available to rogues at 7th level.