Blinding Strikes

With a vicious strike, you blind your enemy.

When you activate this maneuver, you take the Attack action and make a weapon attack, as well as any additional attacks granted by Extra Attack. Until the start of your next turn, when you use a melee weapon to deal damage against a creature, it is blinded and can’t benefit from either blindsight or tremorsense. 

At the beginning of each of its turns, a creature blinded by this maneuver can make a Constitution saving throw , ending the effect on itself on a success.