Rapid Bear Strike p. 88
With a ferocious roar, you leap upon your enemy like a wild beast, slamming your weapon into her with a madman's fury.
You focus your primal fury into a single attack, laying an opponent low with a mighty blow that splinters bones and shatters steel. As part of this maneuver, you make a single melee attack. You gain a +4 bonus on this attack roll and deal an extra 10d6 points of damage. After completing this maneuver, you take a -4 penalty to AC until the start of your next turn.