Aura of Negativity

Dark energy radiates from you in an aura with a 20-foot radius sphere. When the spell is first cast or a creature enters the radius for the first time all creatures (minus you.) Within the radius must make a constitution saving throw, on a failure the creatures within the radius take 4d6 necrotic damage and have disadvantage on saving throws while within the radius. succusses take half the damage. while the spell remains on your turn you may use bonus actions to deal failed creatures an additional 2d6 necrotic damage. each affected creature may repeat the saving throw at the end of their turn.