Reverberating Stone (Greater)

This heavy metal emblem is mounted on the face of the affixed shield and has a dull gray gemstone embedded at its center. When you Activate the talisman, the gem shatters, releasing a powerful shockwave in a 15-foot cone that must include the enemy who struck the triggering blow, if possible. Each creature in the cone takes 2d6 sonic damage with a DC 28 basic Fortitude save. Any creature that fails its save is pushed 5 feet away from you (or 10 feet on a critical failure).

The cone is 30 feet, the damage is 3d6, and the DC is 34.