Blood Bind

Weaving black magic you force a creature into a dark contract signed with blood. You choose a creature within range and it must make a Charisma save against your spell save DC or be bound by the contract. While bound the creature can take actions as normal but you the caster designate on task that the creature cannot do...or else. It can be anything as simple as attacking the caster, casting a spell or running away. When the creature does this it takes 2d12 Necrotic damage and the caster regains hit points equal to the damage taken.