Temple of the Eye
In reality, it was a trap designed to attract the Dragon of Tyr and sap him of all his magic.
But the trap failed as the Dragon found out the Temple and the Eye’s real purpose. He destroyed the temple, burying it somewhere in the Great Alluvial Sand Wastes, along with all the slaves who built it.
The Temple’s location is known only to the Sorcerer-Queen, until she willingly imparted that knowledge onto Shiatri.