The Ring of Menegeld is an ancient artifact, said to be of Netherese origin. Supposeldy, the ring made the wearer imortal, though the fact that it has changed hands so many time through out its history makes its effectivness debatable....
Specifically, the Ring of Menegeld stops the owner from aging, and protects them against bladed weapons such as swords and axes. Curiously, arrows manage to penetrate this defence, as do more volatile energies such as fire and magic.
Another strange property of the ring is that, once worn, the only way to remove it is death (although two adventurers are known to have found a way to remove it).
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