Blood Nova

You cause your blood to explode outward in a sphere of devastation before it returns to your body. Each creature within 20 feet of you must make a Dexterity saving throw. On a failed save, a creature takes 6d6 necrotic damage. On a successful save, a creature takes half as much damage.

This spell has no effect on constructs or undead. After the spell resolves, you regain control of your blood as it returns to your body.

Blood Sacrifice. When casting this spell, you take 3d4 damage as your blood erupts from your body.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd