concentration, 5 minutes/mana
As two actions, you direct wave after wave of concussive kinetic energy in a sphere centered on a point within 20 meters. The sphere spreads around corners and remains 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 failure, it takes 2d6 concussion damage and is pushed 3 meters away from the center of the sphere if it is Large or smaller.
On a critical failure, it takes twice as much damage and is pushed 6 meters away from the center of the sphere if it is Large or smaller.
On a success, it takes half as much damage.
On a critical success, it takes no damage.
At the start of each of your turns if the onslaught is within 20 meters of you, you can cause it to move up to 2 meters in a direction that you choose. If you spend an action, you can move it up to 10 meters.
You can affect a creature of a larger size and push each creature an additional meter for each additional mana expended and increase the damage by 1d6 for every two additional mana expended.