Attacks. You can perform three special attacks with the chains bound to your wrists. These weapon attacks are considered +2 magical melee attacks with reach (if specified). 

Chain Whip. Melee attack, 15 ft. reach. 1d8 base slashing damage.

Pearl Knuckles. Melee attack. 1d10 base bludgeoning damage.

Double Whip. Melee attack, 15 ft. reach. 2d10 base slashing damage, and the target is grappled with a successful hit if the creature is Huge or smaller. Strength Save DC (8 + STR Modifier + proficiency bonus) to escape grapple. Requires a full action (two attack actions) to attack with the Double Whip. As a bonus action while a creature is grappled, you can move the creature to any square within a 15 ft. range of your current position.