The capital city of Tsugaria, Cergis, is home to many mysteries and wonders – The Library of Cergis among them. Rumored to house and hide the Immortal Doctrine, The Library of Cergis contains the largest collection of historical records in all of Terminus.

The exact size of the library is unknown, as the rooms extend under the ice and into the earth and rooms are yet to be discovered. Many of the tomes within the spiral library have yet to be translated and are believed to belong to a time, and perhaps a world, before Frayla.