Vacuum

You target an area within range that you can see. All types of gases are expelled within a 20-foot-radius sphere of where you target, and each creature that requires a gas to breathe must begin to hold their breathe within the area or begin to suffocate if they need to breathe. A nearly completely translucent dark outline frames the area of effect of the spell. If concentration is lost or the spell is ended, the air gently returns back into the space.

If a target uses a physical action (attacking, performing strength based ability checks, etc, but not movement)  while in the sphere, they must make a Constitution saving throw or lose a minute of breath. A creature at most needs to do this once per turn.

If a spell caster casts a verbal spell, they must expend all of their remaining breath to do so.

When a creature begins suffocating within the area of effect, they take 1d8 necrotic damage at the start of each of their turns, stacking for each round they are suffocating within the sphere (2d8 necrotic damage after two rounds of suffocation, 3d8 necrotic damage after three rounds, and so on).

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the sphere radius increases by 5 ft for each slot level above 2nd .