Death Siphon

You have learned to siphon the dark necrotic power of the grave in order to revitalize your own body. As a bonus action you can drain the energy of a nearby corpse within 10 ft of you in order to regain 1d6+ your spell casting modifier of hit points. You must have access to a corpse in order to use this ability.

At Higher levels: when you cast this spell at higher levels you can drain energy from an additional corpse for an extra 1d6 per higher spell slot used. (2d6 at second level, 3d6 at 3rd level etc)