Detonate Vitality

You cause the blood and vitality of a creature you can see within range to erupt. The target and each creature within 10 feet of it must make a Constitution saving throw, taking 3d6 necrotic damage on a success or half as much on a failure. If the target of this spell is a construct or undead, the spell fails.

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