Master of One

One who practices many forms will never truly master one. You have decided to dedicate your time and studies into one weapon of any kind, except archery.

Maneuverability

At the 3rd level, you know all the right angles to strike at, making it harder for your enemies to dodge your attacks. add a +2 to all attack rolls when using your mastered weapon.

Crippling Blows

At the 7th level, when you land your blows they always hit home. Add another damage die to your strike that's equal to you weapons base attack with modifiers. The charges of this ability is equal to your strength modifier. once you reach your max charges, you must long rest to regain all of your charges back.

Necroting strikes

At the 10th level, using your amazing form and technique, your strikes cut deep into your opponents body slowing their healing from all sources. Enemies have disadvantage on all healing rolls and any fixed amount of healing is half. 

Returning Strike

At the 15th level, even when you miss your shots, you hit your shots. When you miss an enemy with an attack, twice per long rest you can hit them with the back end of your weapon, dealing the base damage of your weapon without any modifiers.

Complete Mastery

At the 18th level your training and dedication with your weapon has reached its peak giving you the following bonuses; when attacking with your committed weapon 19 is now a critical, you can attack with your weapon as a reaction, and your weapons now go through any defense that isn't the enemies natural AC.