As an action, you may expend a charge and slam the head your weapon into the ground vertically, unleashing a blinding flash and a powerful shockwave from the hammer. Any creature within 10 ft. of you receives 4d6 radiant damage, is launched back 10 ft, and is knocked prone. Creatures may make a DC 14 Dex saving throw to receive half damage and remain standing. Undead make this saving throw with disadvantage. The weapon regains 1d4 charges at dawn.