Cling to Life

You raise a finger and point it towards the creature that dealt the damage, forcing it to make a Constitution saving throw. On a failed save, the creature takes 4d4 necrotic damage, and you regain a number of hit points equal to the necrotic damage dealt.

At Higher Levels. When you cast this spell using a spell slot of 3rd-level or higher, the necrotic damage increases by 2d4 for each spell slot level above 2nd.