Xardorok's Gauntlet

This spiked gauntlet appears to be made of a strange
black metal.
This gauntlet is a simple melee weapon, and does
1d6 piercing damage on a successful hit.
This gauntlet has three charges. As a reaction to
being hit by an attack, you can expend one charge
to expand the spikes on the gauntlet. You cast
the shield spell on yourself, and if an enemy
attacker misses a melee attack after expending a charge, they take 1d4 piercing damage.