Claret Siphon

You exert your will over the blood of others, using it to aid a creature of your choice. Choose a target within range and up to 3 creatures within 10 ft. of them that have blood. Each creature other than the first must make a Constitution saving throw or take 2d6 necrotic damage, only taking half on a success. You may target a creature more than once with this effect but it only makes one saving throw against you. Your initial target regains a number of hit points equal to half the damage dealt to each additional target, healing for the full damage dealt to them if that target is killed by this effect. 

At higher levels:
You may choose one additional extra target for each spell level above 3rd.