Two Handed Weapon Fighting Master.

When you have this feat your character will be able to reroll 1's and 2's on all two handed weapons! (Holding two daggers does not count) This can be done as many times you want, but can only be done once each attack. (e.g. You are holding your Greatsword and you roll your 2d6s and you get a 1 and a 2, you can reroll both now, but if you roll another 1 or 2 you can't reroll again.