This is an un-droppable item typically equipped in one of the creature's ring slots. It grants immunity to non-magical weapons, and weapons denoted as just "magical" and enchanted at a +1 value.
In short, at least a +2 Enchanted item is needed to strike a creature equipped with this item.
This item is assigned to scores of different creatures in the game.
No other abilities or powers are provided by the item.