Vampuric Transference

The touch of your shadow-wreathed hand can siphon life force from others turning part of that damage into a protect barrier of blood. Make a melee spell attack against a creature within your reach. On a hit, the target takes 3d6 necrotic damage, and you gain Temporary hit points equal to half the amount of necrotic damage dealt. The temporary lasts until used or dispelled.

As a bonus action, you can infuse those temporary hit points into another creatures wounds, healing them for the same amount and dispelling the temporary hit points on you.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.