Dark Transference

You become a conduit of life force. You choose one creature within 10 feet of you. That target must succeed on a Constitution saving throw or take necrotic damage equal to 1d6 + your Charisma modifier. If the target fails the saving throw and damage is dealt, you then choose another creature, other than yourself, within 10 feet of you and you heal that creature for a number of hit points equal to the necrotic damage dealt.