Carrion Crown Adventure Path
A sinister organization of Necromancers that date back thousands of years. Their most famous member was Tar-Baphon, the Whispering Tyrant.
Exact details of the society are difficult to determine. But they seem to focus on creating liches and engineering the release of the Whispering Tyrant.
Symbol is the gagged skull.
Those who learn too much of theirs are often murdered, their mouths mutilated to prevent talking with the dead.
Suspected in killing Professor Lorrimor.