Mastery over weapons

After hours of training, you have learned to better hone your skills with your desired weapon. Because of this you have gained mastery over the weapon and can use your weapon more effectively in combat. (You must take time to train your skills with the weapon and keep track of the hours spent training for that desired weapon)

- After 250 hours of training, you have learned how to better use that weapon. When making an attack roll with the desired weapon type and can now roll with advantage. 

- After 500 hours of training, you have learned how to attack the enemy better using the desired weapon. Critical hits now count when a 19 or 20 is tolled. If you already have a critical hit feat that allows for it at 19 or 20, then this feat adds on allowing for critical hits at 18,19, or 20.

- After 750 hours of training, you have become adaptive with your weapon. Due to the excessive training with your weapon, you can now wield that weapon with one hand if it has the two-handed property or versatile property. For the versatile property, use the damage die that is for when you are wielding it with two hands. As well, while wielding this weapon you gain a +1 AC.

- After 1000 hours of training, you have gained a much better understanding of your weapon. When making rolling for damage you can now add another damage die to your weapon when deciding damage. You also gain advantage on initiative with this weapon as you are always prepared to strike.

- Due to the excessive training with this weapon, you have to roll with disadvantage when attacking with a different weapon. However, if your desired weapon and the different weapon have similar structures then you do not have to roll with advantage. But do not gain any of the advantages connected with this feat.