Blood Bind

You weave tendril of dark magic to bind the blood of creatures within range. Choose up to three creatures within range that you can see. Each target must make a Constitution saving throw. On a failed save, the creature is bound by magical blood chains and takes 2d6 necrotic damage. While bound, the creature's movement speed is halved, and it has disadvantage on attack rolls and Dexterity saving throws. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. Spell damage increased by 1d6 for each spell slot level used above 2nd.