Crown of Wolnir, the Carthus conqueror.
Once upon a time, such things were bequeathed judiciously to each of the rightful lords, until Wolnir brought them to their knees, and ground their crowns to dust. Then the crowns became one, and Wolnir, the one High Lord.
Doesn't appear to have any effects. Testing needs to be done.
|Physical Defence||Elemental Defence|