Brass Castle functions as the home base of the Zexen Knights and was constructed in 422, soon after the establishment of the Zexen Federation. It is located on the border with Grassland and is at the forefront with the intent of safeguarding the Zexen nation.
In addition to the castle itself and the knights stationed there, a large civilian population has emerged around the facility, bringing shops and trade to the area. Several hidden passageways are said to exist inside the castle itself.
- Gensosuikoden Kiwami Encyclopedia, page 348