Blood Bridge

You touch two creatures and draw blood from one of them, the "donor", channel it through yourself, and infuse it into the other, the "recipient". This causes the donor to lose 1d6 hit points, and the recipient to receive hit points equal to the total lost. The donor does not need to be a willing creature, and may make a Dexterity saving throw to evade your grasp. Undead and Constructs are immune to this spell.