Blood Sacrifice

A creature you touch regains a number of hit points equal to 1d4 + your spellcasting ability modifier. You take damage equal to what you restore, although the spell won't lower you below 0 hit points. This spell has no effect on undead or constructs.

The spell’s damage and healing increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).