The very air that surrounds you is now troublesome and vile. The caster has a 15ft aura of unpleasant smells and necromantic energy.

-Creatures have disadvantage on attacks of opportunity against you.

-As a reaction, when a melee attack roll is made against the user they may roll 1d4. That amount the user may subtract from damage that would be dealt to you, or it can deal that amount in necrotic damage to the attacker.

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