Boil Blood

A hostile creature you can see within range must make a Constitution saving throw against your spell save DC or take 2d6 necrotic damage as their blood boils with an acidic infection. All other creatures within 5 feet of the target must succeed on a dexterity saving throw or take 1d8 acid damage as rotten boils burst open. Until the spell ends, you can use your action on each of your subsequent turns to cause this damage again.

This spell does not affect undead, constructs, or elementals.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d6 necrotic and 1d8 acid damage for each level above 1st.