Gnawing Assault
Ranger Attack 19
your beast companion clamps down on a foe and rends its flesh.
Melee beast 1
Target: One creature
Attack: Beast's attack bonus vs. AC
Hit: 2[B] + beast's Strength modifier damage, and the target is immobilized (save ends).
Miss: Half damage, and the target is immobilized until the end of its next turn.
Effect: If the target was already immobilized and your beast companion began the turn adjacent to it, the target takes ongoing 10 damage (save ends).
Gnawing Assault is a daily power available to rangers at the 19th level.[MP:54]