Felling gash
rogue attack 23
Melee weapon
Requirement: wielding a light blade.
Target: one creature
Attack: Dexterity vs. Reflex
Hit: "4[W] + Dexterity modifier damage, and you knock the target prone."
Ruthless Ruffian: The target is also dazed until the end of your next turn.[MP:85]
Felling gash is an encounter power available to rogues at 23th level.