Vital Inversion

You attempt to corrupt the restorative energies affecting a creature so that they cause harm instead. The target must make a Constitution saving throw. On a failed save, the target does not gain hit points or temporary hit points in the triggering instance and instead takes 1d10 necrotic damage.

At higher levels. When you cast this spell using a spell slot of 2nd level or higher, the necrotic damage increases by 1d10 for each slot level above 1st.