The Great Seal of Office was the official seal of the city of Sanctaphrax. Taking the form of an eleven-pointed star engraved with circles and lightning bolts, it was generally worn on a chain by the Most High Academe.
Asides from its original function as a seal, it served as the key to the Ancient Laboratory and probably had many other secret functions in Sanctaphrax. Its design was identical to the Quadrangle Mosaic.
The original Great Seal was eventually lost when its last wearer Vox Verlix died in the Dark Maelstrom. A replica was worn by Cowlquape Pentephraxis and later the High Academes of the Great Glade Academy.