Blackguard’s Blight

With a hissing malediction, you place your curse upon a specific foe. Before the start of your next turn, when you hit a creature with a melee weapon attack you can choose to lay a curse on it. It must make a Wisdom saving throw or be unable to gain advantage on attack rolls against you for a number of rounds equal to your Charisma modifier. This curse can only be applied to one creature at a time.