Tanta Olas's citadel juts up from the depths of a great hole in the ground to tower over the plains of Visoria.
Once known as the home of all Athia's knowledge, it's head-spinning heights are filled from top to bottom with books, most of which were written by Cognoscents—her faithful array of scholars and scribes. A huge impact of some kind has smashed through the uppermost layers, leaving the throne room stranded somewhere in the castle beneath.