Evasive

•When an attacker that you can see hits you with an attack, you can use your reaction to halve the attack's damage against you. you can take this reaction a number of time equal to you proficiency bonus, per long rest

•If you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you can use your reaction to take no damage if you succeed on the saving throw,