The Fortress of Obsidian

* Founding during a War
The War of the Ice Trenches was one of the more recent conflicts in the history of Cardolan. It led to the reunification and securing of the county long with the construction of the Fortress of Obsidian, it was used by George I's brother Arthur the Red as a last holdout and stronghold against his brother. It was captured five years after it's founding by George I and became the capital prison where most criminals are held.
* The Bastion of the North
The Second Great War broke out only 20 years after the construction of the Fortress and it became a point of interest for Cardolan as it withdrew all of their prisoners to lesser prisons and began using it at a staging ground for naval operations.
* Layout and Architecture
The Fortress is made out of Stone and Concrete with brick covering parts of the line around the gate. It has 5 layers of floors going into the side of the mountain it's built on top of. It is capable of holding 30,000 prisoners and capable of lasting several years under siege against a superior force. It was built on a island almost entirely encased in ice and snow, along with being built atop a mountain to maintain a perfect placement.