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 failure, it takes 2d8 concussion damage and is deafened until the end of its next turn.

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.

At the start of each of your turns if the thunder 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.

Augment

• You can increase the damage by 1d8 for every two additional mana expended.

• You can expend 1 additional mana so duration changes to 1 hour/mana.