True Nemesis

You attempt to mark a target for 10 minutes. The creature must make a Wisdom saving throw. The creature must make a Wisdom saving throw against your spell save DC. On a failed save, whenever the creature makes a meele weapon attack against a target other than you that is within 5 feet of you, you can use your reaction to make a melee weapon attack against the attacking creature, provided that it is within your reach. The marked creature has disadvantage on attack rolls against creatures other than you. You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.