Defensive Sword-Master

hen you are wielding a finesse weapon with which you are proficient and you have still atleast 5 ft. movement left in your turn, you can use your remaining movement to enter a defensive stance with your sword. You can either use your reaction to attampt to block an attack of a foe completly by trying to roll a higher attack role that the foe, or add your dexterity modifier and your proficency bonus to your AC until you end this stance. You can only end this stance in your turn with 5 ft. movement or if you use another reaction outside of your turn. While in defense stance, your movement is halfed and you make every attack with disadvantage.

In addition your dexterity score is increased by 1.