The Regalia of Thea
The end result was a horned circlet of pale gold marbled with veins of pale blue, with six points of bone and and another six teeth interspersed with deep blue gems.
The regalia was lost after the fall of the empire, presumed to have been brought into exile by the then emperor. Rumors of it have periodically sprung up around campfires and drinking tables, tales of meeting a person wearing it or hearing that it was lost in a cursed dungeon that no one has ever returned from. The only thing that is certain is that if the regalia were ever to be rediscovered, the finder would be holding an artifact they could easily sell for a small country.
The Regalia of Thea is largely considered to be and artifact of great cultural importance to those who can trace their lineage back to the original empire, especially those in The Theocracy of New Thrain.