"Now we will begin the dance. Remember, child, this is not the iron dance of Westeros we are learning, the knight's dance, hacking and hammering, no. This is the bravo's dance, the water dance, swift and sudden. All men are made of water, do you know this? When you pierce them, the water leaks out and they die.” — Syrio Forel

When you select this feat, you add +1 to your Dexterity score.

Also, when you are wielding a finesse weapon in one hand and no other weapons, you can take advantage of the speed and agility of the finesse weapon to empower your strikes. You gain the following additional benefits:

• On your turn, when you score a critical hit with a finesse melee weapon or reduce a creature to 0 hit points with one, you can make one finesse melee weapon attack as a bonus action.
• Before you make a melee attack with a finesse weapon that you are proficient with, you can choose to take a -3 penalty to the attack roll. If the attack hits, you add +6 to the attack's damage.