The Thracian Phiale is used by necromancers to summon the Shadows of Darkness demons and break powerful hexes. Before it was obtained by Jesse Adams and taken by the Hessians, it was protected by warlocks after Cromwell's Conquest of Britain. As of Dark Mirror, Joe mentioned that it is currently in Jenny's possession.
The Thracians were a real-life, Indo-European tribe inhabiting Central and southeastern Europe. Also, Druids were members of a priestly class in Celtic people of Ireland, Gaul, and Britain.
- Sometime after Necromancer, Jenny got possession of the artifact.