Desecration Aura

You unleash a aura of pain, burning away at all those who dare approach you. At the start of your turn, all creatures within range must succeed on a Intelligence saving throw, or take 1d6 necrotic damage. If a creature takes damage, you gain 1d6+spellcasting modifier temporary hit points. At the end of your turn, all creatures within range must succeed a Dexterity saving throw, or take 1d6 fire damage. Additionally, you take 1d12-spellcasting modifier (minimum 0) necrotic damage. In order to disable this spell before its duration, you must succeed a Intelligence saving throw.