Heavy Weapon Master

Sundering Strike: When you critical hit or roll the maximum damage for the weapon you are using, the target's armor or shield becomes weakened, reducing its AC bonus by 1 until repaired (natural armor and magical armor is unaffected). -- Sundering Strike stacks until the Targets AC Reaches 0

Hand Of Dies: Before you make a melee attack with a heavy weapon that you are proficient with, you can choose to take a -5 penalty to the attack roll to add +10 to the attack's damage.