Blood Boil

All creatures of your choice within range must succeed on a Constitution saving throw, taking 4d8 fire damage + 4d8 necrotic damage on a fail, or half as much on a success. Plants, undead and constructs are unaffected.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 fire and 1d6 necrotic for each slot level above 5th.