"The chalk used in the construction of this castle's walls gives Phidoch its nickname: "The Swan." It is nonetheless a powerful fortress situated in the middle of the island."
The castle is situated in the middle of the main island of Valeria. Renowned for the beauty of its white stone, the relic of the former Kingdom of Phidoch now marks the westernmost stronghold of the Bakram-Valerian Kingdom.
Phidoch functions as the garrison for the Dark Knights Loslorien, allies to the Bakram. Fittingly, it's the battleground of the first act of open warfare Denam wages against Loslorien (excepting the chance encounters of Oz at Boed or Ozma in Rhime).