Greater Monkey Grip

Your expertise with heavy weapons improves further as you combine it with duel wielding to the maximum degree.

When wielding a heavy weapon in each hand you gain the following benefits:

• You may add your ability modifier to your off-hand weapon damage when using two-weapon fighting.
• If you hit with both weapons on the same turn you deliver an additional 1d6 points of damage of the same type of your off-hand weapon.
• 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. When you do so you may attack with both weapons at once, you may do this once per turn.