Piercer

You have achieved a penetrating precision in Combat, granting you the following benefits:

Increase your Strength or Dexterity by 1, to a maximum of 20.
Once per turn, when you hit a creature with an Attack that deals piercing damage, you can reroll one of the attack's damage dice, and you must use the new roll.
When you score a critical hit that deals piercing damage to a creature, you can roll one additional damage die when determining the extra piercing damage the target takes.