Bladesinging - Invoking the Bladesong. You gain a +2/+3/+4 bonus to
Armour Class and your movement speed is increased by 3 m / 10 ft. You also gain 
Advantage in Acrobatics and a +2/+3/+4 bonus to Constitution 
Saving throws. - The AC and saving throws bonus is +2, +3, or +4 at Bladesinger levels 2, 5, or 9 respectively.
