Circular Breathing

Cantrip (transmutation; air, enhancement, water)
Class(es): Bard
Casting Time: 1 Bonus Action
Range: Self
Components: S, M (long breath of clean air)
Duration: Special

You begin carefully regulating your breath so that you can continue playing longer or keep breathing longer in adverse conditions for 5 minutes.

Until the spell ends, you can breathe underwater, and you can utilize bardic performances that would normally require breathable air. In addition, you have advantage on saving throws against gases and environments with adverse breathing conditions.

The duration of this spell increases when you reach 5th level (10 minutes).