You tap into the vitality reserves of a creature you touch, overdriving it's natural healing ability. The creature expends one of its Hit dice, regaining a number of hit points equal to the roll + your spellcasting ability modifier.

If the creature doesn't have any Hit dice available, the spell fails. If the creature expends the max number of its Hit Dice in less than an hour by means of this spell, it gains one level of exhaustion one hour after the last casting of the spell.

This spell has no effect on undead or constructs.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the creature rolls and expends an additional Hit dice for each slot level above 1st.