As an action, you let loose a magically amplified scream audible out to 100 meters that is loud and shrill enough to stop foes in their tracks. Each creature other than you in a sphere centered on you must make a Fortitude saving throw.
On a failure, it takes 1d8 psychic damage and is staggered for the duration.
On a critical failure, it takes twice as much damage.
On a success, it takes half as much damage.
On a critical success, it takes no damage.
A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
You can increase the damage by 1d4 for each additional mana expended.