Source: Critical Role

Wondrous item, ??? (requires attunement)

The Cincture of the Stone King is a gray leather belt with square opals.

The belt requires attunement. Once attuned, it grants the following:

• The attuned gains resistance to psychic damage. In addition, they are immune to being paralyzed or petrified and cannot be knocked prone.
• As an action, you can channel your anger to produce a shock wave of thunderous energy, as with the Thunderwave spell. The spell has a DC of 16 and is considered to be cast at fifth level. Once used, you cannot use this feature again until you complete a short rest.