You take an incredibly deep breath and can hold it for the spell's duration. You don't lose breath when hit, but you do lose all the air you inhaled if you speak (including to Cast a Spell). This spell doesn't create air; if you don't have air to breathe when you cast it, you get no benefit.
Heightened (2nd) The duration increases to 1 hour, and you lose only 10 minutes of breath if you speak.
Heightened (4th) The duration increases to 8 hours, and you lose only 10 minutes of breath if you speak.
Traits
Effects with the air trait either manipulate or conjure air. Those that manipulate air have no effect in a vacuum or an area without air. Creatures with this trait consist primarily of air or have a connection to magical air.
A spell you can cast at will that is automatically heightened to half your level rounded up.
You must physically manipulate an item or make gestures to use an action with this trait. Creatures without a suitable appendage can't perform actions with this trait. Manipulate actions often trigger reactions.