Ruinous Strike is an encounter power available to the Barbarian class at level 13.[Dr386:50]
Ruinous Strike
Barbarian Attack 13
Melee weapon
Target: one creature
Attack: Strength vs AC
Hit: 3[W] + Strength modifier damage, and you can slide the target 1 square, and the target gains vulnerable 5 all to the next attack that hits it before the starts of your next turn.
Thaneborn Triumph: You can slide the target up to a number of squares equal to your Charisma modifier.