Gauntlets of the Earthshaker

These massive, stone-like gauntlets are imbued with the primal essence of the earth. While wearing these gauntlets, your unarmed strikes deal an additional 1d6 bludgeoning damage. Additionally, you can use an action to slam your arms down against the ground, creating a shockwave in a 15-foot radius centered on yourself. Each creature in that area must succeed on a DC 17 Strength saving throw or take 3d6 bludgeoning damage and be knocked prone. You can use this ability once per short or long rest.