Curse Of The Corrupted Bond

You forge a bond with one other Creature or Humanoid in range if your concentration is not interrupted. A black shadowy mark in the shape of a demonic star symbol forms on both entities symbolising the mark. Both now are linked. 

Until the spell ends, any damage taken by either entities are taken by both and any attack made against the caster by the linked entity is with disadvantage and the caster has advantage on any save from the linked entity. Only a Divine Being or the spell Wish can break the connection. 

If the spell is ever broken without the casters consent the caster takes 8d6 psychic damage.