You grab your foe and smash it to the ground. You then place your foot on its neck to keep the creature down.

Daily   ✦     Invigorating, Martial, Weapon
Standard Action      Melee weapon

Target: One creature

Attack: Strength vs. Fortitude

Hit: 2[W] + Strength modifier damage. Until the end of the encounter, the target cannot move on its turn if it was grabbed by you at the start of its turn.

Miss: 1[W] + Strength modifier damage.

Effect: You knock the target prone.

Update (6/14/2010)
In the Hit entry, add “on its turn” after “cannot move.”

Published in Martial Power 2, page(s) 11.