Drowning Aura

You channel the dark forces of elemental water. All creatures within 60ft of you are considered to be holding their breath unless they are capable of breathing underwater. All creatures take 2d4 piercing damage every round from its effects. 

At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d4 for each slot level above 2nd.