Rod of Thunderous Force

This mahogany rod is etched with the image of whirling storm clouds. Once per day on command, the wielder can slam the rod against the ground, releasing a concussive wave of sonic and force energy. This creates a 20-foot radius burst centered on the wielder. While it causes no damage, those within the burst must succeed at a DC 19 Fortitude save or fall prone and be deafened for 1d4 rounds. The wielder is unaffected by this blast. This effect is a force and sonic effect.