Favored weapon

Having fought with your weapon of choice for so long,  you have become attuned to it, giving you these benefits:

• Choose a weapon you're proficient with. You now get expertise, meaning you add double your Proficiency bonus to the attack roll
• If you successfully hit with your weapon of choice, you add your proficiency bonus to the damage roll. 
• If you are about to become disarmed, you may use your reaction to have advantage on the check.