The metal tower known as Balor's Needle is the highest part of the royal palace in Corus, and is used mostly by astronomers and mages. It is very high up, and Keladry of Mindelan is afraid of its height as are others, like Thayet jian Wilima, who won't go up there "for love or for money" said Jonathan IV of Conté, her husband.
Balor's Needle is 100 feet tall. It has a chandelier inside and when not lit it is pitch black. There is a door at the top of the tower that allows a person to walk onto the metal balcony.