Illuminated runes vibrate along each ridge of these ornate silver knuckledusters. Add an additional d6 Thunder damage to unarmed attacks made with these weapons. The sound of each impact carries for 300 feet. You make choose to make a palm strike to avoid activating the effects of the runes. 

You may choose to deplete the power of these knuckles to empower a successful attack with 10d4 Thunder damage, releasing a deafening boom that carries for a 2 mile radius. The target must succeed a CON saving throw (DC 17) or be knocked Unconscious for the next minute. Both knuckles then become dormant until the next long rest.

Roll a d20 to recharge the knuckles. On a 1, the magical energies within the runes fade away forever.

Notes: Damage: Thunder, Damage: Thunder, Unconscious