Aura of Decay

Toxic, corrupting energy radiates from you in an aura with a 30-foot radius. Until the spell ends, the aura moves with you, centered on you. Creatures within this aura suffering from the poisoned condition cannot have the poisoned condition expire or removed from them by any means. Any saving throws made to resist having the poisoned condition applied within this aura suffer disadvantage, and any effects which interact with condition occur, but the removal does not. Whenever a creature within this aura suffers nature, necrotic, or poison damage, they suffer an additional 1d6 damage of the same type.

If a an Aura of Decay ever overlaps with an Aura of Purity, the Aura of Decay spell immediately ends as if it was affected by Dispel Magic, unless it was cast with a 4th level spell slot, in which case both spells end. If an Aura of Decay cast with a 5th level spell slot or higher ever overlaps with an Aura of Purity, the Aura of Purity immediately ends in the same manner.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage bonus granted to nature, necrotic, and poison damage increases by 1d6 per level of the slot above 2nd.