Vitality Theft

You manifest potent negative energy and project it into a a creature you choose within range. That creature makes a Constitution saving throw. That target takes 1d10 necrotic damage on a failed save and half as much on a successful one.

Once this spell has done damage, a small intangible bead, about the size of a pearl, appear in the ethereal realm. Only you can see it. As a bonus action, you can disperse the bead making it disappear from existence to release its energy, granting one creature in the spell's range HP equal to the last amount of damage done by this spell.

At Higher Levels. When using a spell slot of 2nd level or higher, the damage increases by 1d10 per slot level above the 1st.