Counterstriker

You have mastered the art of parry-and-riposte. When you are targeted with an attack using a melee weapon, and you are holding a melee weapon, you can use your reaction to impose disadvantage on the attack roll. If the triggering attack misses, you may make one melee attack against the creature that attacked you as part of the same reaction.

You can use this feature twice and can’t do so again until you finish a short or long rest.