Entropic Ward

At 6th level, you learn to magically ward yourself
against attack and to turn an enemy's failed strike
into good luck for yourself. When a creature
makes an attack roll against you, you can use
your reaction to impose disadvantage on that roll.
If the attack misses you, your next attack roll
against the creature has advantage if you make it
before the end of your next turn.
Once you use this feature, you can't use it again
until you finish a short or long rest.