Eldritch Reconstruction

A single creature within range regains a number of Hit Points equal to 2d10 plus your spellcasting ability modifier. The targeted creature must make a Constitution saving throw against the caster's spell save DC, on a failed save that creature gains one level of exhaustion for 1 minute.

Using a Higher-Level Spell Slot. The healing increases by 2d10 for each spell slot level above 1.