Thousands of black links make up this chainmail gauntlet, its knuckles ending in pitted, battle-worn spikes.

Forged long ago by dwarf hands, the fist is a +1 adamantine spiked gauntlet. While wearing the gauntlet, you are protected from chill metal and heat metal spells. This is a continuous effect and requires no activation.
In addition, once per day you can activate the fist. When you do, your next attack with the gauntlet before the end of your turn deals an extra 2d6 points of damage, knocks the target prone, and stuns it for 1 round (Fort DC 22 negates the stun and prone effects).

Prerequisites: Craft Magic Arms and Armor, Bigby’s clenched fist, endure elements.
Cost to Create: 3,500 gp (plus 5 gp for base item), 280 XP, 7 days.