Dark of the Moons
From Dreams of Hope
An ancient and malign undead entity, once trapped in a necrite pyramid near Freeport. Somewhat akin to a vampire, but (by the modern era) reduced to a possessing spirit, it was imprisoned during the Second Age, and escaped sometime pre-Cataclysm when adventurers disturbed the tomb-prison. It migrated east to the Place of All Gods, where it influenced local shifters to create a cult.
Destroyed by Ad Elementis in early 252 AC when it tried to take possession of them.