Finesse Mastery (5e Feat)
From D&D Wiki
You have trained so long with your preferred weapon that it moves as fast and agile as a Finesse weapon. you gain the following benefits:
- You can select one weapon weapon that lacks the two-handed or heavy property. That weapon is considered a finesse weapon when in your hands.
- You can use a finesse weapon to help defend you or an ally within reach (normally 5 feet) from enemy melee attacks. When you you or an ally within reach are attacked you can use your reaction action to use your blade to attempt to swat the attack away, you can add half your proficiency bonus to your AC or your ally can add half your proficiency to their as you attempt to intercept the incoming attack.
- Before you make an attack with a finesse weapon that you are proficient with, you can choose to take a −5 penalty to the attack roll. If the attack hits, you add +10 to the attack’s damage.
You can select this feat multiple times for different weapon types.