As two actions, you remove all the oxygen in a sphere centered on a point within 20 meters. Any burning creature in the area stops burning. Each creature in a sphere centered on that point must make a Fortitude saving throw. If the creature doesn’t breathe, the spell has no effect on it.

On a failure, it loses 3d6 health and is deafened, can’t speak, and can’t use breath weapons until the end of its next turn.

On a critical failure, it loses twice as much health.

On a success, it loses half as much health.

On a critical success, it loses no health.

Augment

You can increase the health lost by 1d6 for each additional mana expended.