Vitality

Until the spell ends, the damage you take is reduced by any temporary hit points you have for the purposes of determining the DC of a Concentration check..  You also gain temporary hit points equal to your proficiency modifier at the start of each of your turns. When the spell ends, you lose any remaining temporary hit points from this spell.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, you gain 2 additional temporary hit points each round for each slot level above 1st.