This monument is the center of the Inner Compound, and the largest and most grand of the twelve structures inside. It is somewhat ruined, but retains a bit of elegance of its past. It is here that the leader of the Barton Knights, Zander Tekashi, resides. The four story castle may not seem like much, but it is a sacred castle with four tall towers in the intermediate directions of the North-West, North-East, South-East, and South-West. The towers are sealed under lock and key. However, the first two floors are open to the other Knights.

The first floor houses the Entrance Hall, with a giant elegant staircase leading up to the second floor, while off to its sides, are two smaller wooden doors. The one on the left leads to the castle library, filled with legends and lore from throughout the land. The right one leads to the castle kitchen and servants quarters.

The second floor houses the Throne Room of the Archduke Tekashi. Not a standard throne room, the walls are decorated with dark blue and ice white tapestries with the symbol of Zander's homeland and his family coat of arms, the same color scheme applying to the carpeted walkway, and drapes on the windows. There are tables along the sides of the room for guests if needed, and there are two doors on opposing sides of the room from the throne. The left leads to a meeting room, for his Knights and any others he may wish to speak to in private. The right door leads to the guard's living quarters, complete with training room, weapons, forges, and beds for the castle guards. And located behind the throne is a steel door that leads to the third floor.

The third floor is off limits to anyone but Zander Tekashi and personally invited guests. Information about this is unknown at the moment.