Quick idea from a game I’m running.

Improved Two-Weapon Fighting

Prerequisite(s): two-weapon fighting

When you stab and you swing, you’ll be surprised how hard you can hit on that back-swing. You gain the following benefit:

• Increase your Strength or Dexterity, to a maximum of 20.
• When you hit with both attacks as part of your two-weapon fighting ability, double your ability modifier applied to damage on the second hit.

Thoughts?