Blood for blood

A creature you  can touch regains a number of hit points equal to [3][d10] + your spellcasting ability modifier. This spell has no effect on constructs. After the healing has happened the spellcaster takes half of the healing as necrotic damage, rounded down. any healing above the maximum HP of the entity being healed is converted to Temp hit points these temporary hit points cannot exceed the spell level used and cannot be stacked.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the healing increases by 1d10 for each spell slot level above 3rd.