Blood Siphon

A stream of blood flows forth from an enemy within 60 feet and connects to the caster, or a friendly creature within 60 feet of the enemy. The stream drains 2d6 worth of HP in necrotic damage per turn to the enemy, and heals 2d6 plus primary attribute worth of HP to the friendly party. The stream acts as a tether for the spells effect and can be broken by walls and obstacles, but as long as the caster is still concentrating on the spell, the tether will reappear once there are no obstacles blocking the streams path, and a the distance is no greater than 60 feet.