After casting this spell, a shroud of dark flames wreathes your body. For the spell’s duration, any creature within 5 feet of you that touches or strikes you with an unarmed or melee  weapon attack takes an amount of necrotic damage equal to 1d4 + your spellcasting ability modifier. 

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the amount of necrotic damage increases by 1d4 for each slot level above 1st.