Chaining Throes

You attempt to bind a creature with black spectral chains that connects its fate to yours. A creature that you can see within range of you makes a Wisdom saving throw. If failed, whenever you take damage for the duration of the spell, the target creature takes necrotic damage equal to half the damage you took. Additionally if the target regains hit points, you regain an amount of hit points equal to half of the hit points they regained. If the target creature deals damage to you with a spell or weapon attack, you have advantage on your Constitution saving throw to maintain concentration.