Keeping this trend alive

Improved Great Weapon Fighting

Prerequisite(s): great weapon fighting fighter style

The best defense is to hit even harder. You gain the following benefit:

• Increase your Constitution or Strength by one, to a maximum of 20.
• When an roll a 1, 2, or 3 on the damage die for a two handed weapon,  reroll that die.  If any reroll granted by this or your fighting style is a 1, that die counts as a 2.

Thoughts?