It appears to be a large castle with a brown opening, a half-circle shaped doorway, 3 red rooftops and 2 orange rooftops. It is also fully made out of stone bricks. It has 3 windows on the front side, and 2 on the left tower with an orange rooftop. It has 2 torches places symmetrically, along with 2 blue symbols, also placed symmetrically.
It is used to tremendously increase the chance of ignored damage.
It replaces the original Fort with the citadel.
- It looks like the full upgrade to the Castle and the successor of the Fortress.
- For unknown reasons, bases like the Citadel (Fort Base) cannot be removed.
- Even though the doorway is decently large, the opening looks bigger than the doorway.