This ornament can be jewelry, a cloak, or another wearable accessory. It appears to be fashioned from a dragon's scale, tooth, or claw, or it incorporates images in those shapes.
You gain a +1 bonus to AC, and you can't be charmed or frightened. Moreover, each creature of your choice within 30 feet of you has advantage on saving throws it makes to avoid being charmed or frightened or to end those conditions on itself.