As two actions, a rolling clap of thunder appears in a sphere centered on a point within 20 meters. The sphere spreads around corners. It lasts for the duration.
A creature that enters the spell’s area for the first time on a turn or starts its turn there must make a Fortitude saving throw.
On a failed save, a creature takes 3d6 concussion damage and is deafened for 1 minute.
On a successful save, a creature takes half as much damage.
As an action, you can cause the cloud to move 2 meters away from you in a direction that you choose at the start of each of your turns. As an action, you can stop the cloud from moving if it is within 20 meters of you.
You can increase the damage by 1d6 for each additional mana or psi expended.
You can expend 1 additional mana or psi so duration changes to 1 hour/mana or psi.