Source: The Book of Many Things

Armor (light, medium, or heavy), rare (requires attunement)

This intricate grayscale armor was forged in the Shadowfell and is infused with that plane’s gloom.

While you’re wearing this armor, you have advantage on saving throws you make to avoid or end the frightened condition on yourself.

This armor has 3 charges. You can expend a charge to cast the Calm Emotions spell (save DC 15) from the armor. This armor regains 1d3 expended charges daily at dawn.