Bloodbridge

You draw blood from one of two creatures you can see, you choose the original target, the "donor", and choose another target to infuse the lifeforce into, the "recipient". This causes the donor to lose 1d6 hit points, and the recipient to receive temporary 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

This spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).