The Heart of Barsaive
The ring is shaped like a gaunt face twisted in pain, perhaps screaming. It’s made of a metal alloy.
This ring was worn by the Troll Nethermancer Ladras, who was slain by the Protectors of Ardanyan. The Troll was an ex-member of a cabal of Nethermancers based out of Bartertown. Ladras had made a pact with a Horror to gain the knowledge necessary to create Cadaver Men. To that end, the Protectors also recovered a Tome outlining the method to create the undead minions.
Drovick Crystalshaper divined the ring’s purpose as being a means for a Horror to communicate and influence (or perhaps even control) the wearer. The ring is Horror-marked.
Drovick later unmade the ring by crystalizing it in his forge and shattering it with a single blow of his hammer.