Two-part Feat: Weapon Master and Weapon-bound

Weapon Master: You gain proficiency bonus with any weapon you choose to wield, furthermore, you gain double proficiency and a choice of crit on 18 or higher, advantage or damage plus x2 prof bonus; with two weapons, or weapon types (DM's Decision).

Weapon-Bound: You are connected to a specific weapon, or weapons. You may pick and carry weapons in your bag, but you can only use a weapon you are not bound to as long as you are attacking with it. You are allowed to hold the weapon for two (2) turns without attacking, but with your last action of your second turn, if you have not attacked, you must drop the weapon. If you choose to hold on to the weapon, make a con save on a successful save the weapon damages you normally, or does critical damage on a failed save, both ignore AC and DR.