Aura of Destruction

Life-stealing energy radiates from you in an aura with a 30-foot radius.  Until the spell ends, the aura moves with you, centered on you. Each creature you choose in the aura has Vulnerability  to necrotic damage, and if it fails a constitution save vs spell save dc the creature will lose 1 point of their constitution modifier.  In addition, a targeted creature will take 1d4 necrotic damage if it starts or ends its turn within the sphere. 

 At higher levels you will add 1d4 damage for each level above 4. At level 7 the area expands to 60 feet and at level 9 expands to 120 feet.