Battery Shield

The shield rang out like a bell as it stopped the dwarf's hammer mid-swing. The wiry gnome behind the shield popped out a moment later, grinning ear to ear as they said, "Well, nows I've gotta charge ya with assaultin' a battery!"

In confusion, the dwarf replied through gritted teeth, "Don't you mean, assault and—"

Click.

And the shield sparked to life.

This shield builds up a small electrostatic charge while worn. When a creature misses you with a melee attack roll that falls within 2 of your AC and is using a metal weapon, that creature takes 1d4 lightning damage.

Credit: The Griffon's Saddlebag

Shields require the Utilize action to Don or Doff. You gain the Armor Class benefit of a Shield only if you have training with it.